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SERVICE MANUAL CHASSIS CTU-AA
1. Technical specifications
CHASSIS CTU - AA
Mains voltage Power cons. at 220V~ Aerial input impedance Min. aerial input VHF Min. aerial input UHF Max. aerial input VHF/UHF Pull-in range colour sync. Pull-in range horizontal sync. Pull-in range vertical sync. Picture tube range : 220 - 240 V ± 10% AC; 50 Hz (±5%) : 35 W (14''), 50W (20''/21''), 3W (Stand-By) : 75 - coax : 30µV : 40µV : 180mV : ± 300Hz : ± 600 Hz : ± 5 Hz : 14'' / 20'' / 21`' : Mono: 25 1W (14''), 16 2W (20''/21'') : Stereo : 2x16 2x4W (21'')+ TV Systems : : : : PAL BG PAL I PAL BG / SECAM BG DK PAL BG I / SECAM BG L L'
Indications
: On screen display (OSD) green and menu : 1 LED (red in ON and blinking red in stand-by) : 99 : VST
VCR programs Tuning and operating system UV1315A / IEC (VST)
: VHFa: 48 - 168 MHz : VHFb: 175 - 447 MHz : UHF: 455 - 855 MHz : UHF: 455 - 855 MHz : Vol/Prog, +, -, contrast, colour, brightness and sharpness (and hue on program AV with NTSC signal).
U1343A / IEC (VST) Local operating functions
2. Connection facilities
Euroconector:
1 2 3 4 5 6 7 8 9 10
12 13 14 15
Audio Audio Audio Audio Blue Audio Blue CVBS status 1 Green 11 - Green
Red Red
-
R (0V5 RMS ó 1K ). R (0V2 - 2V RMS ò 10K ). L ( 0V5 RMS ó 1K ).
17 18 19 20 21
-
CVBS CVBS CVBS CVBS
Earthscreen.
( 1Vpp 75W ). ( 1Vpp/75W ).
L (0V2 - 2V RMS ò 10K ). (0V7pp/75W ). (0-2V int., 10-12V ext.).
(0V7pp/75W ). Head phone: (0V7pp/75W ). (0-V4 int.) (1-3V ext. 75W ). 8 to 600. Mono : 25mW at 32 Stereo : 2x 6mW at 32. 3,5mm ø.
16 - RGB status
3
3. Mechanical instructions
For the main carrier two service positions are possible (3.1). A: For faultfinding on the component side of the main carrier. B: For (de) soldering activities on the copper side of the main carrier. Position A can be reached by first removing the mains cord from it's fixation, then loosen the carrier lips (1) and then pulling the carrier panel (2) for approximately 10cm. Position B can be reached from position A after disconnecting the degaussing cable. Put the carrier on the line transformer side.
Fig. 3.1
Fig. 3.2
4
4. Oscillograms
5
5. Print Board Layout
+3V3A 8 1 7685 24C04 3 4 2
7015
+3V3
*
*
*
*
7 6 5 3628 RC5 100R
E35 9682 STBY P1.3 SCL
E32
D31 3682 5K6 1 3684 2K2 64 3685 2K2 2628 100N
- TV PROCESSOR - MICROCONTROLER - TXT SDA_2 SCL_2
2 +45 TP33 3 P1.7/SDA 3607 * +3V3 3606 * 22K 5607 10U 3621 9621 POR RES 33P 2603 * 9613 33P 2604 * +3V3 A5 VHFIII P3.3 9664 8 OSCGND 57 +3V3 9695 +3V3 +3V3 9536 +3V3 +3V3 RES D29 3618 * +3V3A 9618 3656 * +3V3A TP17 22K 6 P3.1/ADC1 XTAL_OUT 59 C3 9665 INT/EXT P3.2 XTAL_IN C4 7 1679 12MHz 58 MUTE 3629 1K 1K5 5 ADC1 RESET 60 TP34 4 61 9656 10K 2623 100U 2622 100N +3V3A +3V3 TPMW VDDP 7605 * PMBT2369 INT1 62 3601 1K5 P1.6/SCL SDA 3602 1K5 63
*
6602 HZT33 2602 10U 3603 24K 3604 * 3611 * 3610 * A1 V_VARI 10K 2611 220N 15K 2610 220N 150 3605 220K C2 KEYBOARD 3612
C30
*
*
*
6. Electrical Diagram
10K
9 VSSC/P VDDC
56 2613 100N
5602
+3V3
*
10U 55 2600 RES VPE 2612 100N 54 VDDA TP28 5601 10U 53 3295 * BO TP29 100R 52 3294 * M7:2 B26 M7:1 B_OUT B27
3663 LED P0.5
10
*
3675 1K3 11 VHFI P0.6 3614 47K 9017 +8 VSSA 7601 * BC847 9016 +8 +8 13 SECPLL +8 12
*
C6 270R A7
2601 100U M7:4 GND_RGB B28
A8 UHF
*
*
*
3615 RES
*
3613 47K 2301 220N +8 7401 TDA8357J 5301 10U
GO TP30 14 VP2 RO 51 100R 3293 * M7:3
G_OUT
VHFIII A5 TP16 FBACK 2K7 A9 VGUARD GUARD 9496 7 OUT_A 6 VFB 5 GND 4 OUT_B +12B 9416 3 Vcc 2 Vi_B 1 Vi_A 2403 68N 2306 1U 3301 * 15K M5:1 9417 +45 8 3410 * 9 2303 100U
R_OUT
B25
*
2302 22N
100R 3292 * 15 DECDIG CUT_OFF/VGUARD 50 1K 6496 * LL4148
2290 * 470P M7:5 CUT_OFF VGUARD A9 B24
*
*
*
3495 10K 16 PH2LF BCL 49
2304 220N
2299 RES
3496 1K D24 BCL
*
*
2416 100N 3415 9414
2305 2N2
3414 75R
17 PH1LF 2307 4N7 B2/UIN
48
2298 100N
*
2293 * B_EXT
C23
TP15 3402 390R
*
100N 18 GND3 G2/YIN 100N 19 46 2291 * C21 47 2292 * G_EXT C22
3416 M5:2
2417 TP11 100N
*
*
DECBG 9434 9435 3406 100R 3407 2309 2U2 2308 22N
R2/VIN 100N
*
2411 2N2
*
- FRAME 3411 2K 1% 6413 * 3413 * 330K 13V
R_EXT
20 AVL/EWD INSSW2
45
3291 * FB_EXT 100R TP32
C20
*
*
100R 2412 2N2 9401 2367 1N2 9402 9061 +5 TP21 2001 100U 6 11 2366 1N2 1015 21 VDRB AUDOUT 44 AUDIO_OUT C19 E19
*
22 VDRA NC
3412 2K 1%
43
*
+5A
-TUNER - 1001
+8
23
42
2010 *
2002*
1
IFIN1
CVBS/Y
CVBS_EXT
C18
5010 1U2
4 3014 * 47R 10 2 24 41 5 3015 * 47R IFIN2 GND1
100N +8 +8A 2032 100U 5033 10U
*
3002 2K7 A8 UHF
3 3 +8 * 4 5 2 1
UHF
VHFI
3341 *
25 IREF CVBSINT
40
2034 *
3034 * INT_CVBS
VHFIII
A16
*
2005
*
3005
3003 * 100R 2090 RES 3004 2K7 VHFIII A5 +8
470N
- IF *
6020 RES +5A 3017 2K2
*
39K 1% 2340 100N 26 VSC * VP1 39
100R 47N 3035 100R 3031 *
9004 SIF +8C 180R
E17 +8
*
*
*
3020
180R
27
38
+8A 2031 100N 7004 BC857 1K
3032 * 1032
2036 * 100U 3006 2K7 A7 VHFI
3030 1R
3000
3026 * 100R 2091 RES
TUNERAGC
IFVO/SVO
INT_CVBS
*
*
*
0R05 2006 22N 3007 * 100R 2017 47U
3019 3018 27K 9102
3022 * 2018 10N * 28 37 3023 *
150R TP22 2021 * +8C 5032 8U2
7005 BC847
A16
* * *
AUDEEM 2092 RES 3010 * V_VARI A1 3008 4K7 2102 PLLIF
- VIDEO *
390R 29 DECSDEM EHT 36 100N 3027 100K 3033 1K 1033 3028
*
*
*
EHT
D15
A1
9103 SC_AUDIOOUT C11
2103
2106
*
+8
*
2023 47N 3103 1K2 30 GND2 AUDEXT TP10 7104 * BC847 31 SNDPLL FBISO 34 3371 35
3025 22K 2105
220K C14 AUDIO_EXT 2U2 9371 H_FLYBACK D13
*
*
2111 820P 3102 1K2
32 NC HOUT
33
9403
3372 22K 9404 5K6
*
*
3101 2K7
6372 8V2
*
3104 *
+8
27K
LINE_DRV
D12
*
2104 4N7
3373 * TP9 +3V3 470R
1001 1015 1032 1033 1679 2001 2002 2005 2006 2010 2017 2018 2021 2023 2031 2032 2034 2036 2090 2091 2092 2102 2103 2104 2105 2106 2111 2290 2291 2292 2293 2298 2299 2301 2302 2303 2304 2305 2306 2307 2308 2309 2340 2366 2367 2403 2411 2412 2416 2417 2600 2601 2602 2603 2604 2610 2611 2612 2613 2622 2623 2628 3000 3002 3003 3004 3005 3006 3007 3008 3010 3014 3015 3017 3018 3019 3020 3022 3023 3025 3026 3027 3028 3030 3031 3032 3033 3034 3035 3101 3102 3103 J7 J6 K2 K2 C3 I8 J6 J7 K7 I2 K7 K6 K2 L3 K3 J2 J3 K1 J8 K8 K8 L6 L6 M6 L2 L5 M6 F2 H2 H2 G2 G3 G3 F6 F6 F6 G6 G6 G6 G6 H6 H6 K5 I6 I6 H9 H8 I8 G7 H7 D2 E2 B8 C2 C2 B8 B9 E3 D3 B3 B2 A2 K8 J9 J9 K9 J8 K9 K9 K8 L9 I5 J5 K6 K6 K6 K7 K3 K3 L2 K9 L2 L2 K1 K2 K2 K1 J2 J2 M6 M8 L8 3104 3291 3292 3293 3294 3295 3301 3341 3371 3372 3373 3402 3406 3407 3410 3411 3412 3413 3414 3415 3416 3495 3496 3601 3602 3603 3604 3605 3606 3607 3610 3611 3612 3613 3614 3615 3618 3621 3628 3629 3656 3663 3675 3682 3684 3685 5010 5032 5033 5301 5601 5602 5607 6020 6372 6413 6496 6602 7004 7005 7015 7104 7401 7601 7605 7685 9004 9016 9017 9061 9102 9103 9371 9401 9402 9403 9404 9414 9416 9417 9434 9435 9496 9536 9613 9618 9621 9656 9664 9665 9682 9695 M7 H2 F2 F2 F2 E2 G6 J5 M3 M2 M2 G9 H6 H6 F7 H8 I8 H9 G9 G8 H8 G2 F2 B9 B9 B8 B8 B8 B7 B6 B8 B8 B9 F8 E8 F8 B6 C2 B2 C3 C6 E8 E8 A5 A3 A2 J6 K2 J1 F6 E2 D2 B2 K7 M2 H8 F2 B8 K2 K1 G4 L7 G7 E8 B7 A2 J1 F6 E6 I7 K6 L8 M2 I6 I6 M3 M2 G8 G7 G9 H7 H7 G7 D1 C1 C7 C1 B2 D7 C7 A6 D1
6. Electrical Diagram
2202 2204 2208 2237 3202 3203 3205 3206 3207 3214 3215 3216 3217 3220 3221 3226 3228 3229 3236 5235 6201 6216 6229 6230 7200 9226 9230 B6 D6 E3 E3 C6 C5 E2 E3 C8 C8 C6 C5 D8 D8 D8 D3 D6 D5 D3 E3 B5 C5 D5 F3 C6 D3 F3
Pos 1015 1032
Pal BG Pal I Pal BG Pal I Mono Mono Stereo Stereo G1963 5.5 J1952 6.0 G1984 5.5 J1981 6.0
Pos 1540 2187 2540 3189
MONO 1W T630mA 220U 680U -BYT42M BYT42M TDA8941P
MONO 3W T1A 220U 680U -BYT42M BYT42M TDA8943SF
STEREO 4W+4W T2.5A 1000U 1500U 1R BYW32 BYV98 TDA8944J
23
COMPONENTS -
- DISPLAY -
TP20
FOCUS
2237 2N2
6230 BAV21
2208 10U
3236 1K5
+200
3206 1M
9230 RES
VG1
- RGB & DISPLAY
B
GR
RG
33 L6
1M1
AQUA
3203
3216
3229
1K5
1K5
1K5
6201 BAV21
6216 BAV21
+200
+200
+200
6229 BAV21
3202
3215
100R
100R
3228
100R
2204 560P
2202 100N
9
8
7
+200
5
7200 TDA6107Q 6
4
1
2
3
A-D
3207 *
3214 *
3220 *
3221 *
3217 *
560R
L2:2
L2:3
L2:4
L2:1
L2:5
RGB_GND
CUT_OFF
G_OUT
B_OUT
R_OUT
A27
A26
A25
A28
A24
D39
D38
D37
D42 D41 D40
FF
FF
+200
FOCUS VG2 L1:4 L1:3 L1:1 L3 3205 51R 5235 AQUA * 1K5 3226 9226 VG2 VG2 FF FF* FF* 25KV 1M1
Pos A1 C3 C4 C5 C6 E 2102 2103 2105 2106 2194 2196 2860 3186 3191 3196 3197 3198 3199 3808 3810 3856 5538 9004 9143 9144 9151 9450 9802 9809
Mono YES -YES ---3N3 10U 2U2 -100U -4N7 -68R -0R05 0R05 0R05 JMP JMP -JMP -JMP JMP JMP -JMP YES
Stereo -YES -YES YES YES 33P --22N -10N -0R05 -0R05 -----100K FERRITE JMP ---JMP ---
6450 6540 7187
Pos C1 C2 23 2445 2446 2448 3189 3214 3217 3220 3221 3415 3416 3444 3235 3457 3460 3480 5445 5480 5500 5525 9480
14" YES -MINI -8N2 10U -560R 560R --4R7 4R7 5K6 2W 1R 0.3W 27R 0.5W 7K5 -LOT 14" -CU15 SOPS 14" JMP
20"/21" -YES NARROW 220P 9N1 47U 1R --560R 560R 3R3 3R6 5K6 3W 1R 0.5W 47R PR01 6K2 1K LOT 20" 57331 CU15D3 SOPS 20" --
A - E - F C1 +8 +3V3 VIDEO 3877 RC5 +8
14" SCART + AV 9686 +3V3
C2
20"/21"
*
21
*
A30
*
1685E 2876 10U
9685 3661 1K 3664 * 3 +3V3 3876 470R 100R 3875 * 2 A16 1685
6. Electrical Diagram
3664E * 3 +3V3 100R
2
20
3661E 1K 1 INT_CVBS 1 3874 *
7875 BC847 * 6849 RES
IN
CVBS_EXT A18
19
*
*
2685E 100U TSOP1836SS3V 68R 9684 +3V3 +3V3 3845 * R_EXT A21 100R 6857 * 9857 +8 RES RES 3843 * G_EXT A22 100R 6853 * MENU RES RES 6854 * 26 RES 6855 * 6856 * TSOP1836SS3V
2685 100U
18
3865 75R
+8 6848 RES *3891
16
GND
GND
17
*
FB_EXT
15
LED A6 9687
3855 *
75R
13
14
6663E B4_4534
6663 B4_4534
3858 75R
*
A20
11
12
+8
75R
10
3881 10K
3853 *
9
A2
3879 * 47K
7876 *
INT/EXT A4
8
KEYBOARD
*
BC847
*
3665 680R 25 A23 P3667 1K3 24 P+ A11 SC_AUDIO_OUT_L E46 B_EXT
3841 * 100R 6851 * RES 6852 * RES
7
3880 5K6
3883 10K
6
3852 *
3851*
75R
5
AUDIO_EXT_R * 5K6 E43
*
4
2852
220P
*
3854 *
SC_AUDIOOUT 9809
3
3860 * 220R 2860
*
2
2850
220P
*
3850 *
100K
2856 RES
3810
1
AUDIO_EXT_L 5K6 E44
3808*
43
*
*
9169 HEADPH_GND 3191 2194 1
C3
SC_AUDIO_OUT_R E45 42 3 11 2854 * RES
*
E47
2857 3864 * 220R
220P
2859 RES
3856 *
*
AUDIO 2858 220P
*
C52 HPH_MONO 3197 * E49 9167 3196 * HPH_R/SPKSW E48 C48 3199 9166 HPH_L
9168
2196
2192 10N
*
*
9802
3893* GND GND
*
3198
*
AUDIO_EXT A14 10 2
- AMPLIFIER C4
TP35
C6
48 3194 * HPH_R/SPKSW E48 C48 HPH_MONO C52 9113 AUDIO_OUT A19 C19 MAIN_R C50 9114 3184 * 0R05 2181 * 220N 2 7 OUT+ OUT+11B RES 3193 * 1 VCC GND 7187 TDA8941P 8 9143 +11B
7187C TDA8944J 7187B TDA8943SF 54 OUT2+
*
NC 2154 100N +11B 17 VCC2 16 GND2 9
*
*
3171 10K
3154 82R
GND 15 OUT214 NC MODE 8
*
3183 RES
3170
*
*
13 2197 RES IN2+
7
C5
3 IN+ 6147 * 9147 2147 LL4148 +5B 7140 * BC847 SVR
6 2182 10U
12 SVR 11 MODE 6 SVR 10
*
*
*
10U
3145 * 3147 100K MUTE A3 MAIN_L 9140 10K 3186 * 3140 22K 3142 10K 3141 * 7141 * BC847 10K
4 MODE IN-
5
IN2-
IN-
*
*
2179 220N
*
2193 * 2195 1N5 220N *2184 2183 1N5
9 IN18 NC 7 IN1+
5
IN+ 4 E51 6
*
9144 3185 RES 55 9151
220N
NC 5 OUT1+ 4 2155 +11B 100N VCC1 3
OUT+
*
VCC
*
3189 9170 3190 +11A 2187 1000U +11B +11B 2190 220N +11B 9181 +11B +11B
3 3155 82R GND1 2 OUT11
2
OUT1
*
*
IN
*
1685 1685 2147 2154 2155 2179 2181 2182 2183 2184 2187 2190 2192 2193 2194 2195 2196 2197 2685 2685 2850 2852 2854 2856 2857 2858 2859 2860 2876 3140 3141 3142 3145 3147 3154 3155 3170 3171 3183 3184 3185 3186 3189 3190 3191 3193 3194 3196 3197 3198 3199 3661 3661 3664 3664 3665 3667 3808 3810 3841 3843 3845 3850 3851 3852 3853 3854 3855 3856 3858 3860 3864 3865 3874 3875 3876 3877 3879 3880 3881 3883 3891 3893 6147 6663 C6 C8 K9 J3 L3 K4 J7 K5 K3 L3 M8 M8 G7 K3 G8 K3 G7 K4 C7 C9 F3 F3 G4 F2 G4 G4 F2 F4 C4 K8 K8 K8 K7 K9 J3 M3 K4 J4 J7 J7 L7 L8 M8 M8 G8 J8 J8 H7 G7 H7 H7 C7 C9 C7 C9 E8 F8 F3 F2 E5 E5 D5 F2 E3 E2 E3 F2 D3 F2 D3 F4 G4 C2 C5 C4 C4 B4 E2 E2 E1 E1 D2 G3 K9 D6 6663 6848 6849 6851 6852 6853 6854 6855 6856 6857 7140 7141 7187 7187 7875 7876 9113 9114 9140 9143 9144 9147 9151 9166 9167 9168 9169 9170 9181 9684 9685 9686 9687 9802 9809 9857 D8 C2 C2 F4 F4 E4 E4 D4 D4 D5 K8 K8 K6 K3 C4 E2 J8 J8 K9 J5 L5 K9 L5 H8 H8 G8 G8 M6 M6 C7 B7 B7 D7 G2 F4 D5
E
- LINE 3457 2458 5445 10N 5447 +101.5 47U 2448 2 3456 100K M5:3 3460 8 3462 * TP14 TP13 7445 3444 2460 47N 12K 6463 1N4148 2462 4U7 9464 BCL A24 M5:6 +8 EHT A15 2451 10U 3480 6451 BYT42M TP12 2450 470N 3451 33K 9480 5480 FOCUS B42 VG2 B40 RES 3455 H_FLYBACK A13 100K 2449 10N 1 11 25KV B41
6. Electrical Diagram
6447
2 BUT11AF 3470 4R7 7 6 3 5441
2444 47N 3 1 6470 BYT42M 4
*
3445 47R
BYD33M 2446
+101.5 5K6 3W
2445
TP38 6452 BYT42M 3452 +45 1R 2453 22U 9450 +12 TP37 3235 9 5 3450 6450 BYT42M 10 3238 4 1R 5449 47U 2454 220U TP40 6449 +12B 3478 * 390R 4R7 3453 7478 BC337 2467 220U +8
3440 * 100R 7440 2440 * 5440 2442 560P 2470 10U 3442 5K6 1U 22U LINE_DRV
*
*
6440 LL4148 3441 10K BF422
*
A12
9479
6474 C8V2 3474 56R
M6:1
M6:4
M6:3
3449 1R
BYT42M 2455 470U 3479 TP39 390R 1/2W +5 7479 BC337 3475 * +8 470R
FF
+200
FF
6479 C5V6 2% B39 B38 B37
DEGAUSS 22 M2:1 1500 T 2 A H 4 5500 3 2500 470N 2 1 3501 PTC RES 9503 M1:2 M2:2
2506 3N3 2534 TP1 5525 9504 +101.5
2N2
6504
1N4007
RES 5534
2504
6505
6530
3530 +101.5A FERRITE
9501
2N2
7
BYV95C
2502
6502
6503
1N4007 1N4007
2507 RES KA5Q0765RT
2505 68U
8
2530 47U 3572
4R7 PR03 TP6
1N4007 3527
270K
9575 7514 +11 10 9 3571 560R
3541 100R
RES +3V3 7575 BC337 * 2561 22U
M1:1 3504 10M
* 2562 DRAIN 3528 *
12 2510 1N 6525 BAV21 6523 BAV21 6570 * 3V3
SYNC
FB
VCC
GND
*
5
4
3
2
1
3570 47R
3573 0R05 *
6571 RES
*
5533 FERRITE
270K
TP5
100N
*
TP7 POR A29
*
- POWER SUPPLY 2514 47U TP3 6511 3526 470R 1N4148 TP2
3576 180R 3525 2515 100U 10R 3522 2 1K2 2524 3N3 6524 1N4148 TP4 9506 3 3535 1K 4 1 5
7571 BC847
3575 RES
*
*
+11 2532 470P 1540 6540 2540 FERRITE 5532 +11 FERRITE 3539 270R +101.5 +11 2533 100U 9542 TP8 5538 +11A 3542 1K 2531 RES 3531 180K 3533 22K 2539 * 22N 7533 KA431LZ
*
*
*
*
6521 RES 2528 RES
2527 47N
3511 3K9
7515 TCET1103G
*
3540 RES 3536 39K
3534 47K 6531
9572
*
7572 * BC847
3537 5K6
A31
*
1N4148 TP18 TP19 3532 10K
STBY
*
9505
3519 4K7
1500 1540 2408 2440 2442 2444 2445 2446 2448 2449 2450 2451 2453 2454 2455 2458 2460 2462 2467 2470 2500 2502 2503 2504 2505 2506 2507 2510 2514 2515 2524 2527 2528 2530 2531 2532 2533 2534 2539 2540 2561 2562 3235 3238 3440 3441 3442 3444 3445 3449 3450 3451 3452 3453 3455 3456 3457 3460 3462 3470 3474 3475 3478 3479 3480 3501 3504 3511 3519 3522 3525 3526 3527 3528 3530 3531 3532 3533 3534 3535 3536 3537 3539 3540 3541 3542 3570 3571 H8 K3 B7 E8 E6 D7 D5 D4 B5 B5 C7 C6 D3 E2 F3 B4 C3 C2 E1 D5 H8 I6 H7 H6 I5 H4 I5 J6 J7 J5 K6 L6 L6 I3 L3 J3 K3 H3 L4 K2 I2 I2 E4 E4 E8 E7 E6 D7 D5 F3 E3 C6 D3 E2 C7 C6 B4 C3 C2 D4 F2 G2 E2 F2 C6 I7 I9 L5 L3 K5 J5 K6 I5 I5 H2 L3 L2 L2 L3 K4 L3 L1 K4 L3 I3 K4 J3 I3 3572 3573 3575 3576 5440 5441 5445 5447 5449 5480 5500 5525 5532 5533 5534 5538 6440 6447 6449 6450 6451 6452 6463 6470 6474 6479 6502 6503 6504 6505 6511 6521 6523 6524 6525 6530 6531 6540 6570 6571 7440 7445 7478 7479 7514 7515 7533 7571 7572 7575 9450 9464 9479 9480 9501 9503 9504 9505 9506 9542 9572 9575 I3 J3 J3 J3 E8 D6 D4 B4 E3 C6 H8 J4 K3 J6 H4 K2 E7 D4 F3 E3 C6 D3 C2 D5 E2 G2 I6 I6 H6 H6 K6 K6 J5 K5 J5 H3 L3 K3 J3 J3 E6 D5 E2 F2 J7 L4 L4 J3 L2 I3 E2 C1 F2 C6 H7 H9 H2 L7 K5 K2 L2 I4
7701 TDA9875A
- STEREO 1
*3757 2777 470N +5B
64 PCLK Vddd2 63 NICAM LOR 62 ADDR1 LOL
TP25
2
A - C
3
3748 * +5B 3K3 A32 SCL_2 3749 * +5B A35 SDA_2 2773 10N TP31 9727 3751 * 3K3 TP27 9728 3750 *
4 SCL
*
2775 10N TP26
61 MOL 60 SDA
*
MAIN_L C51
100R
5 MOR 59
3770 * +5C +11B +12 7781
*
1R
MAIN_R C50
6. Electrical Diagram
100R
6 Vssa1 7
2771 *
Vdda 58
3771 18K
*
2772 470N
*
2R2
Vdec1
*
2770 10N
AUXOL
*
2U2 3772 33K 2769 * 2U2
0R05 3780 * BC337 3775 330R 1/4W +11B +12
2799 HPH_L
470N
2750
3752 * 2768 10N
8 Iref
*
57 AUXOR 56 P1 Vssa3
10K
*
9
3769 18K
7780 0R05 3781 * 2798 HPH_R/SPKSW
*
10 SIF2 11 Vref1
*
2751 100N A17 SIF 27P 120P 5741 22U TP24 9740 2740 * 2742 *
55 PCAPL
2767 10N
3773 330R 1/4W
54
*
*
*
3774 33K
BC337
*
100U
C49
100U
C48
PCAPR 53
HEADPH_GND 2766 10N 9780 C47
12 SIF1 13 ADDR2 SCOL2 Vref3
2765 47U
*
3741 6K8 2741 180P
52
*
14 Vssd1 SCOR2
51
3759* *3753 2753 470N 5753 * +5B
15 Vddd1 16 CRESET Vssd2 Vssa4
50
*
1R FERRITE
49
2754 1U
*
17 Vssd4 18 XTALI
1750 24.576MHz
48
*
2764 *
C46
SCOL1 47
SC_AUDIO_OUT_L 2763 470P 2U2 2762 * C45
*
SCOR1 19 XTALO 20 P2 21 SYSCLK 22 SCK 23 WS 24 SDO2 25 SDO1 26 SDI2 27 SDI1 28 TEST1 SCIL2 Vdec2 37 Vref(p) 38 Vref(n) 39 i.c. 40 i.c. 41 Vssa2 42 i.c. 43 i.c. 44 Vref2 45 46
SC_AUDIO_OUT_R 2761 470P 2U2
2760 47U +12A TP41 +12 9701 9702 3702 390R 1/2W 9704 3704 10R 3703 * 750R 6702 C5V6 2% 7702 BC635 9703 +5C 2702 47U 5702 JMP +5B
2759 47U 3756 270R
2758 470N
A19 AUDIO_OUT C19
3758 * RES
2755 * RES
29 MONOIN 30 TEST2
9710 GND GND
36 SCIR2 35 Vssd3 31 EXTIR 32 EXTIL SCIR1 SCIL1 33 34
3755 * 15K 3754 * 15K 2757 * AUDIO_EXT_L 330N 2756 * AUDIO_EXT_R 330N C43 C44
*
*
*
1750 2702 2740 2741 2742 2750 2751 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2775 2777 2798 2799 3702 3703 3704 3741 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3769 3770 3771 3772 3773 3774 3775 3780 3781 5702 5741 5753 6702 7701 7702 7780 7781 9701 9702 9703 9704 9710 9727 9728 9740 9780 H7 I2 E8 F8 E8 C7 E7 G7 G7 L7 M3 M3 K4 J4 H4 H4 H3 G4 G3 E4 E4 E4 D4 D3 C4 C3 C4 C4 B4 A4 D2 C2 I2 I3 I3 F8 B8 B8 B8 C8 D7 F7 M3 M3 K4 A3 L8 F8 D3 C3 C3 D3 D2 D3 D2 C2 D2 I1 F8 F7 J2 G5 I2 D3 C3 I3 I3 I2 I2 M8 C8 B8 E9 E2
7.- CIRCUIT DESCRIPTION
7.1 SMALL SIGNAL &MICROCONTROLLER/TEXT(Diagram A)
The small signal is processed by IC 7015. This IC called Ultimate One Chip ( UOC ) also has an embedded microcontroller. The CTU-AA chassis is designed to accept 2 different ICs in the position 7015, TDA9350 for TXT models and TDA9380 for no TXT. The associated circuitry is the same. The small signal part includes IF detection, video processing, chroma decoder, RGB , sync processor and sound decoder (mono sets). It is fully controlled by the embedded microcontroller. The microcontroller contains an specific program that assures all the functions of the appliance, including 2 menus, one to control the set (see Instructions Manual) and another for Service Mode (see Service Instruct. chapter 8.). For stereo models sound decoder (IC 7101) is controlled also for IC 7015 by I2C bus. The IC for TXT sets (TDA9350) contains a teletext decoder, including the following functions: TXT on/off, reveal, freeze, temporary cancellation, clock, subcode, zoom, index, flof, page +/-, X/26 and 8/30 packet decoding (station identification and start-up page).
Fig. 7.1 TDA 93XX block diagram 7.1.1 IF detection IF detection is intercarrier type, that means sound and picture are detected in the same circuit (PIF). - IF amplifier (pins 23, 24): The IF signal coming from pin 11 of the tuner (1001) is filtered by the IF SAW filter (1015) and applied to IF amplifier of IC7015 by means of pin 23 and 24 input. The IF bandpass characteristic is determined by the SAW (Surface Acoustic Wave) filter.
- PLL demodulator ( pins 37, 58, 59): The IF-signal is demodulated with the help of a PLL detector, which one is used to regenerate the IF reference signal. Reference signal is determined by the PLL loopfilter pin 37 and calibrated by microcontroller x-tal ( pins 58, 59). It is alignment free. Demodulation is achieved by multiplying reference signal with the incoming IF-signal. - AGC (pin 27): The IF AGC time constant is internally fixed. The tuner AGC voltage (pin 27) is applied to pin 1 of the tuner and adjusted by microcontroller (see chap. 8.4). - Video output (pin 38) : This baseband CVBS signal with 2.5Vpp (sync inclusive) of nominal amplitude, contains the FM intercarrier sound signal. Sound is filtered out by a ceramic trap (1032 or 1033) which frequency can be different depending on the system: 5.5 MHz for Pal BG and 6.0 MHz for Pal I. 7.1.2 Sound processor Mono sets: - FM demodulation (pins 31, 29): FM sound is filtered from CVBS (pin 38) by a loopfilter (pin 31) and demodulated. Decoupling sound demodulator is made by a capacitor on pin 29. - De-emphasis and audio out (pin 28): De-emphasis is made by C2102 at pin 28. The signal at this pin is drived to the euroconnector sound output (see Diagram C) by transistor 7104 . - External audio in (pin 35): External audio proceeding of pins 2,6 of euroconnector is applied to this pin. Selection between internal or external is done by an internal switching controlled by I2C (see INT/EXT, chapter 7.6). - Audio out (pin 44): After a volume control (by I2C), this output is drived to the input IN+ of the final sound amplifier IC7187 (Diagram C). Stereo sets: SIF signal (pin 38): Video signal containing sound signal is drived to sound stereo processor IC7101 (see chapter 7.6 and diagram E) 7.1.3 Video processing - Video switches (pins 40, 42): The internal CVBS signal proceeding of pin 38 is now fed to pin 40 of 7015. External CVBS proceeding from pin 20 of Euroconnector is present on pin 42 of 7015. The IC switches between internal and external are controlled by I2C bus (see INT/EXT, chapter 7.1.8). The selected CVBS signal is internally supplied to the synchronization , teletext acquisition circuits and the video identification circuit for IF ident. - Luminance processor: CVBS is also internally applied to luminance processor, which is composed of chrominance trap filter, luminance delay line and peaking circuits. Sharpness control modifies peaking by I2C. 7.1.4 Chroma processing This circuit is an internal (no pins associated) automatic decoder for Pal and NTSC systems commanded by I2C bus. - ACC and chroma filter: Video signal coming from video switches is supplied to PAL/NTSC chroma bandpass filter via a variable gain amplifier which is controlled by ACC and ACL detection circuits. The dynamic range of the ACC is 26dB and detects only the burst amplitude. The ACL is a chroma amplitude detector and is active when the chroma/burst ratio exceeds approximately 3. It ensures that CVBS signal to chroma bandpass filter is limited for large. - PLL/DCO: Chroma PLL is integrated and it operates during the burstkey period; the DCO (digital controlled oscillator) generates a subcarrier signal Fsc in phaselock with the incoming burst signal. The reference signal for the DCO (Fref.) is derived from the crystal oscillator (1679). Different colour frequencies are internally switched by I²C. The hue control rotates the DCO reference phases (H0, H90) from -40 to 40 degrees for NTSC signal via I²C bus. - PAL/NTSC demodulation: The 0ª & 90ª signals are supplied to the burst demodulator circuits to obtain (B-Y) and (R-Y) respectively. Chroma delay lines used in demodulators are internal. 7.1.5 RGB processor - External RGB inputs (pins 46, 47, 48): RGB inputs coming from euroconnector (see diagram C), are AC coupled (C2291/92/93) and converted internally in YUV signals. Then are switched with internal YUV (YUV SWITCH) by fast blanking. - Fast blanking external (pin 45): When fast blanking is high external RGB is displayed, only if TV is in external AV (program 0). Fast blanking can switch signals for full screen (by a DC voltage) or for a part of the screen (by a pulse voltage). - Matrix: After switching, YUV signals are converted to R-Y, G-Y and B-Y in the internal MATRIX circuit. Saturation control is received by I2C bus. - Black stretcher: Internally the luminance signal is connected to the YUV select circuit and via the input clamps it is supplied to the black stretcher. The black stretcher circuit, fully integrated, extends the grey signal level . This extension is dependent upon the difference between actual black level and the darkest part of the incoming video. RGB adder: RGB signals are obtained in this circuit by adding R-Y, G-Y and B-Y proceeding from matrix and Y proceeding from black stretcher. - RGB OSD: RGB inputs for OSD and TXT are internally inserted to RGB signals. Fast blanking used is also internal. 45).
- Beam current limiter (pin 49): The beam current limiter circuit functions as an average beam current limiter (BCL) as well as peak white limiter (PWL). Both functions reduce the contrast and brightness of RGB signals. Contrast reduction begins when Vpin 49 < 3.1V and brightness reduction begins when Vpin 49 < 1.8V. BCL: Average beam current present at pin8 of 5445 (Diagram D) is feedback to pin 49. When beam current is high, voltage of C2462 is lower, D6462 conducts and Vpin 49 decreases. PWL: This circuit is an internal detection circuit, which comes into action if the difference between measurement DC level and white level exceeds approximately 2.6V. Then a current of 200µA is internally produced to discharge 2298 and Vpin 49 decreases. - RGB output circuit (pins 51, 52, 53): RGB outputs are drived to RGB amplifier (Diagram B). - Continuous Cathode Calibration (CCC) (pin 50): This circuit is an auto-tuning loop which stabilizes the black level (offset) as well as the cathode drive level (gain) of each gun. Pulses in 3 consecutive lines R, G and B (pins 51, 52, 53) at the end of frame blanking are used on alternating fields, one field for black level, following for cathode drive level. Cathode currents of 8mA for black level and 20mA for cathode drive level are stabilized. Cathode current is present at pin5 of IC7200 (Diagram B) and measured on pin 50. RGB outputs are adapted to keep cathode currents measured, for example when VG2 voltage is adjusted, DC level of RGB outputs is automatically corrected. - Warm-up detection circuit (pin 50): At the start up a DC voltage of 2.5V is present in the RGB outputs (pins 51, 52, 53). As soon as beam current is detected on pin 50, RGB circuit starts in normal operation. If RGB circuit is damaged or grid 2 is low, the RGB circuit could not start (black picture) due to current is not detected. 7.1.6 Horizontal synchro - Start up: The horizontal oscillator starts is commanded by microcontroller. During start up circuit provides a softer operating horizontal output with a higher frequency. - Hor. sync. separator: Fully integrated sync. separator with a low pass filter, slicing level at 50% of the synchronized pulse amplitude. - Horizontal Phi 1 detector (pin 17): This circuit locks the internal line frequency reference on the CVBS input signal. It is composed of a phase comparator and an internal VCO of 25MHz (1600*15625). The free running frequency is stabilized using the 12 MHz reference of the X-tal oscillator. Phi 1 detector filter is made by external components at pin 50. Phi 1 time constant is automatically controlled by software for broadcasting signals. For video signals (AV and program 99) constant is always fast to prevent top bending on the screen. - LBF (pin 34): Line Fly Back input, is obtained by the network R3456/55 (Diagram D) and R3371/T7372. - Sand Castle (pin 34): Sand Castle output obtained at this pin is used only internally. Levels of sandcastle pulse are 5.3V for burst detection, 3V for line blanking and 2V for frame blanking. - Horizontal Phi 1 detector (pin 16): The flyback position respect line blanking on TRC cathode is controlled by this circuit. Phi 1 detector filter is made by C2305 pin 16. Horiz. shift can be adjusted by I2C ( see chapter 8) - HOUT (pin 33): Horizontal output is an open collector which one drives the horizontal driver stage (T7440 diagram D). 7.1.7 Vertical synchro and vertical drive - Vert. sync. separator: It is an internal integrator to separate frame sync. pulses from CVBS. - Vertical divider system: The divider system uses a counter that delivers the timing for the vertical ramp generator in the geometry processor. The clock is derived from the horizontal line oscillator. Mode used is automatic 50/60Hz identification with 50Hz priority. - Vertical sawtooth generator (pin 25, 26): A reference current of 100mA is realized at pin 25 by means of an internal reference voltage (3.9V) and resistor R3341. This 100mA reference current is used to derive a 16mA current to charge C2340 (pin 26) during vertical scan. The charge current can be adjusted with the I²C bus control, (VERT. SHIFT). The external capacitor is discharged during vertical retrace by the vertical divider system. - Vertical geometry processor: The saw tooth signal that is derived from the sawtooth generator can be controlled by I²C bus. Control adjustments are: S-CORRECT, VERT.SLOPE, VERT.AMP and VERT.SHIFT (See chapter 8). - Vert. output stage (pins 21, 22): The vertical geometry processor has a differential current output to drive a DC coupled frame deflection (7401). - EHT compensation (pin 36): A voltage inversely proportional of beam current, proceeding of pin 8 of line transformer (5545 diagram D) is applied to pin 36 to stabilize vertical amplitude from EHT variations. - Vertical guard input (pin 50): A vertical retrace pulse proceeding from pin 8 of IC7401, is added to cut-off voltage at pin 50 (this pin has 2 separated functions, cut-off function see chapter 7.1.5). If there is not pulse or its level is not correct (should be above 3.65V, 0.8msec.), the set goes to standby mode. (See chapter 7.7.1 Protections). 7.1.8 Microcontroller/ Text Following there is an explanation of the different functions of the microcontroller indicating pins number assigned: - Tuning (pin 4): The unit has a VST (Voltage Synthesized Tuning) system. This system works by tuning to a station on the tuner through a linear variation of the tuning voltage (V-VARI) from 0V to 33V applied on pin 2 of the tuner. It is generated on pin 4 of the µC and converted to an adequate level for the tuner using T7605. While searching, µC are always reading internally AFC (Automatic Frequency Control) and video identification signals. When video signal is identified, µC stops searching and do a fine tuning to reach a right AFC value.
- Control key (pin 5): Pin 5 is activated by a DC voltage. When control keys are not activated, a voltage of 3V3 is produced by R3618. If one control key is activated, this pin is connected to ground directly or by a resistor R3665, R3667 (Diagram C), decreasing its voltage. There are 3 voltage levels depending of the key used: 0V for MENU, 1V for P- and 1.9V for P+. - Mute output (pin 6): This pin is a 3 state output used to control the sound amplifier (see chapter 7.4). States are 0V, open and Vcc (3.3V). - INT/EXT input (pin 7): The set can switch to external (AV on the screen) by remote control (selecting program 0) or by rise edge at pin 8 of euroconnector (see diagram C). The IC switches internally video and audio to external. In both cases the user can switch to internal changing the channel. - Band switching (pin 8, 11): There are 2 outputs for band switching pin 11 for VHFI and pin 8 for VHFIII. The µC controls the channel band in the tuner by a voltage of +5V at the correspondent output. UHF band is controlled by means of transistor 7601. If the set is in VHF, one of the pins 8 or 11 are high and transistor conducts in such a way the UHF voltage is 0V. If the set is in UHF, pins 8 and 11 are low, transistor is cut and the set is in UHF. - LED (pin 10): The LED (D6663 diagram C) lights up with a low current when the television set is ON and with a high current when the set is on Standby. While the set is receiving a remote control signal, the led is blinking. - Picture controls (brightness, contrast, colour, sharpness) are processed internally by I2C bus. - Sound controls (pins 2, 3): Mono sets: Sound controls are processed internally by I2C bus Stereo sets: All information necessary to control stereo functions including sound controls, are processed by a communication I2C bus between the µc and the stereo decoder (IC 7101 pins 4, 5). - Standby (pins 1, 33): When the set is switched to stand by, line stops (pin 33). In addition to this, pin 1 switch to low level to make Power Supply in burst mode (see stand by 7.5.3). - OSD outputs: The RGB and fast blanking signals used for On-Screen Display (OSD) and also for TXT are internally inserted to RGB outputs (pins 51, 52, 53). - Oscillator (pins 58, 59): A 12-MHz oscillator is determined by a 12-MHz crystal (1679) between pins 58 and 59. - P.O.R (pin 60) . : Power on reset (POR) is internal, activated when the set is switched on. If the µC shows abnormal behaviour it is advisable to reset it switching off/on the set. Reset can be done also by a short circuit between pins 60 and 61. - RC5 (pin 62): The commands transmitted by the remote control handset are received by infrared receiver (1685) and passed to the microcontroller for decoding. - EEPROM (pins 63 and 64): The microcontroller is connected to non-volatile memory IC7685 (EEPROM) via bus I2C. The following information are stored in the memory: - Channel data including tuning voltage and band of all the channels. - Personal preferences (PP), menu mix and child lock on user menu. - All settings included on Service Menu. 7.1.9 Supplies and decoupings - Small signal analog supply (pins 14, 39): The same +8V supply coming from line deflection is connected to pins 14 and 39 for small signal processing. A separated supply (C2036) feeds video and sound traps circuit. If +8V supply is not present at pin 39 or pin 14 during the first 4 seconds after switch ON the TV set, the microprocessor goes to Standby mode (See chapter 7.7 Protections) . - Digital supply (pins 54, 15): A +3V3 supply is used for digital circuit of TV processor (pin 54). A decoupling capacitor for this supply is present at pin 15 (C2301). Pin 54 is used also to supply the µC. - Bandgap decoupling (pin 19): The bandgap circuit provides a very stable and temperature independent reference voltage of 4.0 V which one is used specially in the analogue video processor part. - µC supplies (pins 54, 56, 61): The µC has several +3V3 supplies,
- Pin 54: Analogue supply (Oscillator, ADC). - Pin 56: Digital supply to µC core. - Pin 61: Supply to all output ports of theµC.
When the set is in stand by, the µC switch to stand by mode, only 3V3 supplies are present but consumption is reduced.
7.2 RGB AMPLIFIERS (diagram B)
The RGB signals available at pins 51, 52 and 53 of IC7015 (Diagram A) must be amplified and inverted in order to reach the level required for driving the tube. The integrated circuit IC7200 (TDA6107) is used for this purpose. RGB inputs (pins 2, 3, 1): These signals are connected to negative inputs of internal operational amplifiers. There is and internal reference voltage of 2.5V for the amplifiers. Negative feedback of amplifiers are internal resistors. RGB outputs (pins 8, 7, 9): These outputs are applied to the RGB cathodes of the tube. Clamping diodes to +200V (6201, 6216, 6229) and 1K5 series resistors (3203, 3216, 3229) are added for flash-over protection.
- Continuous Cathode Calibration (CCC) (pins 50): This circuit is an auto-tuning loop which stabilizes the black level (offset) as well as the cathode drive level (gain) of each gun. Pulses in 3 consecutive lines R, G and B (pins 51, 52, 53) at the end of frame blanking are used on alternating fields, one field for black level, following for cathode drive level. Cathode currents - Cathode current feedback (pin 5): Cathode current used in Continuous Cathode Calibration circuit (See 7.1.5) is obtained at this pin and feedback to pins 50 of IC7015 (Diagram A) - White adjustment: Gain and cut-off point of RGB amplifiers can be adjusted by I2C in the service menu (See chapter 8) - Anti-spot circuit: When the set is switched off, the capacitor 2208 keeps charged and a negative voltage is put at VG1 of the tube.
7.3 DEFLECTION (Diagrams A, D)
7.3.1 Frame deflection (Diagrams A) Full bridge vertical deflection output performed by the integrated circuit TD8357J (7401). - Frame supplies (pins 3, 6): There are 2 supply voltages, +12V (pin 3) is the main supply and +45V (pin 6) is used to supply the output stage during flyback time. - Vertical inputs (pins 1, 2): (pins 21, 22): The output currents proceeding from pins 21, 22 of IC7015 are converted to voltages by resistors R3411/12 in such a way that 2 inverted sawtooth are present in the differential inputs of amplifier (pins 1, 2). - Vertical outputs (pins 4, 7): Vertical output is DC coupled to deflection coil. That means linearity adjustment is not necessary. HF loop stability is achieved by a damping resistor R3413. - Feedback input (pin 9): A voltage proportional to current deflection is present in R3415/16 and a feedback to pin 9. - Vertical flyback: This signal is internally added to vertical output (pin 7) using supply voltage at pin 6. - VGUARD circuit (pin 8): This circuit generates a high level during flyback period, and is used to protect the TV set in case of a vertical failure. (See protections, chapter 7.7) 7.3.2 Line deflection (Diagram D) The final line transistor is driven by the transformer 5441, whose primary winding is driven by the transistor T7440 connected to the line drive output of IC7015 (pin 33). The horizontal deflection stage is carried out in a conventional way, with the deflection transistor (T7445) and line transformer (5445). Beam current info (BCI) is present at C2460. There are the following supply voltages obtained from line transformer (5545): - Frame supply (+12B):Main frame supply present at capacitor C2455. - Flyback frame supply (+45 ): Flyback frame supply present at capacitor C2455. - +8V stabilizer: +8V for small signal is made from +12V (C2454) by D6474 and T7478 - +5V stabilizer: And additional voltage of +5V for small signal is made also from +12V (C2454) by D6479 and T7479. - Stereo supply (only stereo models): +12V from C2454 is drived to 7702 (Diagram E) to stabilize +5V for stereo decoder (7101. - FF : The heather voltage is reduced by R3235/38 and 5235 (Diagram B) to obtain 6.3Veff at the CRT .
7.4 SOUND AMPLIFIER (Diagram C)
Sound amplifier is a Bridge Tied Load (BTL) amplifier including short circuit protection, mute and stand by mode. IC used can be TDA8941P for 14" and 17" models, TDA8943SF for 20" and 21" models or TDA8944J for stereo models. Behaviour is the same for 3 models. TDA8944J is a double amplifier, that means 2 supplies, 2 inputs and 2 outputs. - Supply (Vcc, SVR): Main supply (Vcc) is taken from +11V of Power Supply (C2540 diagram D). The IC creates internally a half supply, present in SVR pin and decoupled by 10uF capacitor (C2182). - Sound input (IN+): Amplifiers have differential inputs (IN+,IN-). Audio input is connected to IN+ decoupled by 220nF capacitor (C2181/84) and IN- is decoupled to ground by other 220nF capacitor (C2179/93). To avoid oscillations there is a 1n5 (C2183/95) capacitor connected between both inputs. - Mode input (MODE): This input is commanded by mute signal proceeding from the µC (pin 6 of 7015 diagram A) and has three modes depending of the voltage level: - Standby mode (Vmode = Vcc): Consumption is very low (used during stand by). In this case Vmute=0V, T7657 and T7659 are cut, MODE signal is high - Mute mode (2.5V
- Operating mode: (Vmode<0.5V): Sound output present (normal operation). In this case Vmute=3V3 both transistors conduct, mute signal is low. - Sound output (OUT+/OUT-): Amplified sound is drived to the loudspeakers. Mono sets: Headphones output has been connected in such a way that when headphones are connected, loudspeakers are switched off. Stereo sets: Headphones output are coming directly from pins 57 and 58 of stereo decoder IC7101 (see chapter 7.6 and diagram E).
7.5
POWER SUPPLY (Diagram D)
Mains isolated switched mode power supply (SMPS). controlled in variable frequency mode. IC7514 (KA5Q075RT) includes control circuit and output MOSFET. Output feedback is done by means of an optocoupler (7515). - Switching behaviour: The switching period is divided in on-time, when energy is extracted from the mains into the primary winding (8-12 of 5525), off-time, when energy in the transformer is supplied to the loads via secondary windings of 5525 and dead-time when no energy is extracted or supplied. - Standby mode: Output voltages are present when the set is in stand by. Standby is done cutting line deflection and making the supply in burst mode in such a way that power consumption is very low. 7.5.1 Degaussing and Rectifier - Degaussing: R3501 is a dual PTC (2 PTC's in one housing). After switch on set, PTC is cold so low-ohmic and so degaussing current is very high. After degaussing, PTC is heated so high-ohmic, so in normal operation degaussing current is very low. - Rectifier: Mains voltage is filtered by L5500, full wave rectified by diodes D6502-D6505 and smoothed by C2505 (300V DC for 220V AC mains). 7.5.2 Regulation - Power MOSFET (pin 1): Power stage is done by an internal MOSFET between pin1 and ground. Current is sensed by an internal resistor and limited to 5A peak. (See chapter 7.7.2 Protections) - Start up and supply (pin 3): When the set is switched on, a current via R3527 and R3528 is applied to pin 3. When C2514 is charged to 15V, the power supply starts and the internal MOSFET conducts. A voltage across transformer windings is built up. The voltage across winding 4-2 is rectified by diodes D6523/25 and used to supply the IC on pin 3. Voltage of pin3 depends on the output voltage and is about 28V. If Vpin3 is lower than 9V supply stops and if it is higher than 32V, output voltage is limited. (See chapter 7.7.2 Protections) - Sync (pin 5): A pulse voltage proceeding from winding 4-2 is applied to this pin. A delay is added by means of C2524, R3522 and R3526 to synchronize starts conduction of MOSFET at minimum Vds voltage. - Secondary feedback (pin 4): Line supply feedback is obtained at pin 4 by divider R3531/34/19, the differential amplifier (IC7533) and the optocoupler (IC7515). Voltage at this pin is about 1.1V - Output regulation: IC7514 stabilizes output voltage by controlling T-on and so the frequency and the duty cycle. Output control is done by the following way: If line output is higher, current input of the differential amplifier (IC7533) is higher (amplifier has a reference voltage of 2.5V). Current in IC7533 and also in the optocoupler (IC7515) is higher. Voltage in pin 4 is lower, T-on is internally reduced and output is reduced. Output voltage of supply can be adjusted by R3518. 7.5.4 Secondary side - Line supply: Line supply present at capacitor C2530 should be adjusted to the correct value (depending on the TRC) by means of P3534. - Sound supply (+11V): This supply is used for sound output amplifier and to feed 3V3 stabilizer. - µC supply (+3V3): +5V3 is regulated by T7575, D6570 and T7571. 7.5.3 Stand by: When the set is put in standby, line driver (pin33 of IC7015, diagram A) stops and deflection supply is not loaded. Only a reduced load to supply the µC (+3V3) is necessary. To reduce more the power consumption, during standby T7572 is cut by STBY signal (pin1 of IC7015, diagram A), then current in IC7533 is increased by means of D6531 and output voltages are reduced. As a consequence of this, the supply switch to burst mode operation. During working time C2514 is charged till 12V, then supply stops and C2514 is discharged till 11V.
7.6 STEREO DECODER
The CTU Stereo chassis is based in the TDA9875A chip. This is a single-chip Digital TV Sound Processor for analog and digital multichannel sound systems in TV sets. In the stereo chassis the sound part in the IC7015 (TDA9350) is disabled. All sound signal, analog and digital is processed in IC7101 (TDA9875A). The TDA9875A decodes NICAM signals (B/G and I standard) and two-carrier FM modulation A2 signals (B/G standard). - Control bus (pins 4, 5): Stereo is fully controlled for the µC of IC7015 (Diagram A) via I2C-bus. Status information present in internal registers of IC7101 is read by µC to determine whether any action is required. Control is exercised by the µC also, writing in other internal registers of IC7101. This control includes volume, balance, bass, treble, pseudo stereo, spatial, and Automatic Volume Level (AVL). - Oscillator (pins 18, 19): The circuitry of the crystal oscillator is fully integrated, only a external 24.576 MHz crystal is needed. - SIF input (pin 12): SIF signal is filtered from video signal coming from pin 38 of IC7015 (Diagram A) by a passband 5.5MHz to 6.5Mhz filter (C2740/41/42 and L5741). - AGC, ADC: SIF is passed through an AGC circuit and then digitized by an 8-bit ADC operating at 24.576 MHz. The gain of the AGC amplifier is controlled from the ADC output. Then signal is separated in 2 ways, one for FM and other for NICAM. - FM demodulation: FM signal is fed via a band-limiting filter to a demodulator. If signal is stereo A2, decoder recovers the left and right signal channels from the demodulated sound carriers. A stereo identification signal is sent to the µC. - NICAM demodulation : NICAM signal is transmitted in a DQPSK code at a bit rate of 728 kbit/s. NICAM demodulator performs DQPSK demodulation and feeds the resulting bitstream and clock signal onto the NICAM decoder. A timing loop controls the frequency of the crystal oscillator to lock the sampling rate to NICAM decoder: The device performs all decoding functions in accordance with the "EBU NICAM 728 specification". - Audio processing: After demodulation, digital signal is selected (FM, A2 or NICAM) and processed according µC control. Following functions are provided: Forced mono, stereo, channel swap, channel 1, channel 2, spatial effects, Automatic Volume Level (AVL), volume, balance, bass and treble.
- DACs (pins 54, 55): Then signals are transformed to analog by DACs and sent to the outputs. Post filter capacitors for DACs are at pins 54 and 55.
- Sound outputs (pins 60, 61): After a volume control (by I2C), sound outputs (MAIN R and MAIN L) are drived to the inputs IN+ (pins 12 and 6) of the final sound amplifier IC7187C (Diagram C). - Headphone outputs (pins 57, 58): Headphone outputs are drived by followed emitters 7780 and 7781 to the headphones. These outputs are independent of loudspeakers outputs and controls are separated. - External audio out (pins 47, 48): Signal at these pins are drived directly to the euroconnector sound outputs (see Diagram C). - External audio in (pins 33. 34): External audio (R and L) proceeding of pins 6 and 2 of euroconnector (Diagram C) is applied pins 33 and 34 of IC7101 and digitalized by an ACD circuit. Selection between internal or external is done from the µC (IC7015) by I2C bus (see INT/EXT, chapter 7.6). - External audio out (pins 47, 48): Signal at these pins are drived directly to the euroconnector sound outputs (see Diagram C). - +5V stabilizer: +5V supply for stereo processor is obtained from +12V (C2454 diagram D) by D6702 and 7478. This voltage comes to supply voltages of IC1701 (pins 59, 15, 64) - Digital supplies (pins 15, 64): +5V supplies at pins 15 and 64 are used for digital circuits of stereo processor. Power ON reset (pin 16): When the set starts, C 2754 is slow charged by an internal 50K resistor to +5V. When digital supplies are present and oscillator is working, reset is done if pin 16 is low (Vpin16<1.5 V). - Analog supply voltage (pin 53, 59): There is a +5V supply for analog outputs (DACs and operational amplifiers) at pin 59. A 50% reference voltage (2.5V) for these circuits is present at pin 53. - ADC supply voltage (pins 38, 39, 40, 46) : A 3.3V supply voltage is obtained internally and decoupled on pin 38 by C2758. Positive and negative reference voltage for ADC is present at pins 39 and 40. A 50% reference voltage (1.65V)
for ADC is present at pin 46. - Front-end supply (pins 7, 8, 11) : A separated 3.3V supply voltage (decoupled on pin 7 by C2750)
is necessary for SIF demodulator. By means of a 200mA current generator at pin 8, a 2V reference voltage is produced at pin 7.
7.7 PROTECTIONS
If TV does not start or it switches to stand by, try to start again in a few minutes and if problem remains check protection pins explained following. 7.7.1 Protections in IC7015 (Diagram A) - Pins 14, 39: If +8V supply is lower than 6V (pin 39 or pin 14) during the first 4 seconds after switch ON the TV set, the microprocessor goes to Standby mode (See also chapter 7.1.9). - Pin 50: If the vertical retrace pulse at this pin is not correct (should be above 3.65V, 0.8msec) during the first 4 seconds after switch ON the TV set, the vertical guard blanks the RGB outputs and the TV switch to Standby (See also chapter 7.1.7). This protection operates in the following situations: - When the vertical deflection fails and there is no pulse. - When the vertical retrace pulse is higher than 0.9msec. (for example vertical amplitude is too high) - An extra protection is obtained when there is too much current in the CRT (for example +200V supply is missing), because in this case, DC level of pulse is lower by means of cut-off signal. (See fig. 7.7.1)
6v 3.65v
Correct Vertical Deflection
3.65v 2,8v 3,2v
Failure
0.8v 0 mS 20 mS 0 mS 20 mS
Fig 7.7.1 Vertical guard protection To repair the set more easily, Vguard protection can be disabled, in this case the vertical guard blanks the RGB outputs, but TV does not enter in Standby mode. To disable Vguard, item 8 of Service menu MANUAL C-O should be 01 (See chapter 8.1). Due to a change in MANUAL C-O is difficult to do if the set switch to Standby, Vguard can be disabled also connecting a diode (1N4148) in series with a 2K2 resistor between pins 10 and 7 of IC7015 (Anode at pin 10). Be careful to disconnect this network after the set is repaired.
7.7.2 Protections in IC7514 (Diagram D) - Pin 1: Primary current is sensed by an internal resistor for the IC. If this current is increased to 5A peak, supply works in a intermittent way (ON and OFF). That can be provoked for a short circuit on secondary outputs. - Pin 3: If Vpin3 is lower than 9V the under voltage protection stops the supply. If Vpin3 is higher than 32V over voltage protection limits output voltage.
8.- ELECTRICAL ADJUSTMENTS
8.1 Service mode
The signal processor IC7015 is fully controlled by I2C, so that the most of adjustments of the set can be made by service menu. - Enter in Service mode: - Select program 75 and press at the same time OSD key (+) on RC and MENU key on local key board during 4 seconds. Service mode is indicated by a S symbol on the down left corner of the screen. Note : Controls (volume, contrast, brightness and saturation) will be pre-adjusted to the mid position. - Display Service Menu : When the set is in service mode it is possible to display Service Menu by OSD key (+) on RC. Using P+, P- keys of remote control the different items can be displayed (see table 8.1): ITEM Nº 1 2 3 4 5 6 7 8 9 10 11 12 Description ADJUST VG2 CATH.DRIVE TXT V-SHIFT TXT H-SHIFT V-GUARD DISA AGC START RESERVED MANUAL C-O R CUT-OFF G CUT-OFF BRIGHTNESS CONTRAST 01H 20H 20H PP PP Value Hexa PRG 0CH 02H 02H PRG 25H Nº 13 14 15 16 17 18 19 20 21 22 23 24 ITEM Description R GAIN G GAIN B GAIN S-CORRECT VERT.SLOPE HOR.SHIFT VERT.AMP VERT.SHIFT SYS OPTIONS MENU OPTIONS READ STATUS RESERVED Value Hexa 20H 20H 20H 20H 20H 20H 20H 20H 00H 00H PRG 00H
Table 8.1. Service menu. Settings are hexadecimal values - Pre setting values: When E2PROM is replaced, pre-setting values indicated on table 8.1 are stored by the µC. (see 8.7 E2PROM). - Adjust by Service Mode: When a item is selected, using V+, V- keys of remote control it can be adjusted. Items 2, 5, 23 and 24 have fixed values = pre setting values, rest of items see 8.2 to 8.6. - Remove service menu: There are 2 ways to remove service menu - Saving the new settings: Using OSD (+), MENU or INSTALL keys on RC. - Keeping the old settings: Switching the TV to stand by. Service mode continues active. - Remove Service Mode: Switching off the TV
8.2 Power supply and focusing:
- Power supply voltage: - Adjust brightness and contrast controls at minimum. - Connect a DC voltmeter across C2530 (Diagram D). - Adjust R3534 for a required voltage depending on the model and the TRC used ( see table 11, page 23). - Focusing: - Adjust with the potentiometer placed on the line output transformer.
8.3 AGC Adjustment
- Connect a pattern generator to the aerial input with RF signal amplitude = 1mV. - Adjust the value of AGC start (item 6 of Service menu) so that voltage at pin 1 of the Tuner (1001) is 3.7V.
8.4 White D
8.4.1 Manual cut-off: Item 8 of adjusting values should be 00 (see table 8.1), that means set is in automatic cut-off. However it is possible that RGB do not start (black picture), due to grid 2 is not adjusted. In this case we recommend to change to Manual cut-off ( Item 8 = 01), pre-adjust grid 2 to have a good picture and change to automatic cut-off ( Item 8 = 0) before continue adjusting (see warm-up detection circuit in 7.1.5) 8.4.2 Grid 2: - Connect a white pattern generator. - Adjust contrast at 00 and brightness at 36. (00 and 24 in the service menu because hexadecimal values are used - Put parameter 1 of the service menu ADJUST VG2 = 1. An arrow will be displayed on the left upper corner. - Adjust VG2 potentiometer ( in line transformer ) till the arrow will be transformed to a square. - In a few seconds, arrow will be disappear and ADJUST VG2 parameter will be come back to 00. 8.4.3 White checking: - Connect pattern generator containing grey scale - Adjust the set to normal operation and reduce the saturation control to minimum. - Allow the set to warm up about 10 minutes and check visually if the grey scale has correct colour. - If not, enter to Service menu and adjust G and B gain (items 14 and 15) until a desired grey is obtained. In the case that adjusting is difficult, start again with the setting values of table 8.1 (items 9, 10, 13, 14, 15).
8.6 Geometry
- Connect a circle pattern generator with the controls at nominal conditions and enter to service menu.
Adjust to have picture centred in vertical position by service menu item 16. - Horizontal shift: Adjust to have picture centred in horizontal position by service menu item 18. - Vertical amplitude: Adjust picture height to cover the screen by service menu item 19. Adjustments only if necessary: - TXT Shift: Vertical and horizontal shift of OSD or TXT can be adjusted by items 3 and 4 of service menu. - Vertical slope: When item 17 is selected, only upper part of the screen can be seen. Vertical slope is adjusted when centre line of the pattern is just visible. - Vertical S correction: S correction can be adjusted by item 20 of service menu.
8.7 Options:
The type of chassis is defined by items 21 and 22 of service menu. The following alternatives are available:
SYSTEM OPTIONS (Item 21)
PAL B / G PAL - I
VALUE
MENU OPTIONS (Item 22) 16 Languages menu English bars menu Global menu (without languages ).
VALUE 00 01 03
00 01
Important note: All the chassis have identification sheet when the chassis type is indicated: "Cod. service: SXXMXX", where SXX means the option of system and MXX means the option of menu Example: S01M00 means system = 01 (Pal I) and menu = 00 (13 Languages menu) When the chassis or the EEPROM (IC7685) have to be replaced, be careful to keep the same type of chassis, setting correctly the chassis options.
8.8 Error messages
The microcomputer also detects errors in circuits connected to the I2C (Inter IC) bus. These error messages are communicated via OSD (On Screen Display) :
Error message
F2 F3 F4 F5
Error description Eprom communication error µC internal error (RA M) Internal bus communication SDA2/ SCL2 bus wrong communication SDA2/ SCL2 bus no communication Eprom data error
Component
IC7685 IC7015 (µC) IC7015 IC7101 (stereo) IC7101 (stereo) IC7685
No sound menu
F6 F7 F8
Not allowed options * Vertical guard
Item 21,22 service menu. pin 50, IC7015
* If SYS OPTIONS or MENU OPTIONS are not possible in this chassis, the µC change to allowed options and first time TV set is switch on F7 message is displayed. Options should be checked ( see 8.7)
9. Safety instructions, maintenance instructions, warning and notes
Safety Instructions for Repairs
1. Safety regulations require that during a repair: - The set should be connected to the mains via an isolating transformer. - Safety components, indicated by the symbol ! should be replaced by components identical to the original ones - When replacing the CRT, safety goggles must be worn.
Warnings
1.In order to prevent damage to IC's and transistors any flash-over of the EHT should be avoided. To prevent damage to the picture tube the method, indicated in Fig. 9, has to be applied to discharge the picture tube. Make use of an EHT probe and a universal meter is 0V (after approx 30s). 2. ESD. All IC's and many other semi-conductors are sensitive to electrostatic discharges (ESD). Careless handing during repair can reduce life drastically. When repairing, make sure that you are connected with the same potential as the mass of the set via wrist wrap with resistance. Keep components and tools on the same potential. 3. Proceed with care when testing the EHT section and the picture tube. 4. Never replace any modules or any other parts while the set is switched on. 5. Use plastic instead of metal alignment tools. This will prevent any short circuits and the danger of a circuit becoming unstable. 6. Upon a repair of a transistor or an IC assembly (e.g. a transistor or IC with heatsink and spring) remounting should be carried out in the following order: 1. Mount transistor or IC on heatsink with spring. 2. Resolder the joints. Notes 1. After replacing the microcomputer first solder the shielding before testing the set. This is needed as the shielding is used for earth connection. If this is not done the set can switch into protection mode (see description of the SMPS). 2. Do not use heatsink as earth reference. 3. The direct voltages and waveforms should be measured relative to the nearest earthing point on the printed circuit board. 4. Voltages and oscillograms in the power supply section have been measured for both normal operation ( ) and in the stand-by mode ( ). As an input signal a colour bar pattern has been used. 5. The picTure tube PWB has printed spark gaps. Each spark gap is connected between and electrode of the picture tube and the Aguadog coating.
2. Safety regulations require also that after a repair:
- The set should be returned in its original condition. - he cabinet should be checked for defects to avoid touching, by the customer, of inner parts. - The insulation of the mains lead should be checked for external damage. - The mains lead strain relief should be checked onits function - The cableform and EHT cable are routed correctly and fixed with the mounted cable clamps in order to avoid touching of the CRT, hot components or heat sinks - The electrical resistance between mains plug and the secondary side is checked. This check can be done as follows: · Unplug the mains cord and connect a wire tween the two pins of the mains plug. · Switch on the TV with the main switch. · Measure the resistance value between the pins of the mains plug and the metal shielding of the tuner or the aerial connection on the set. The reading should be between 4.5 M and 12 M. · Switch off the TV and remove the wire between the two pins of the mains plug. · Thermally loaded solder joints should be oldered. -This includes components like LOT, the line utput transistor, flyback capacitor. Maintenance Instructions It is recommended to have a maintenance inspection carried out periodically by a qualified service employee. The interval depends on the usage conditions. - When the set is used in a living room the recommended interval is 3 to 5 years. When the set is used in the kitchen or garage this interval is 1 year. - During the maintenance inspection the above mentioned "safety instructions for repair" should be caried out. The power supply and deflection circuitry on the chassis, the CRT panel and the neck of the CRT should be cleaned.
FIG. 9
21
10.-REPLACEMENT PARTS LIST 10.1.- Electrical
MISCELAEOUS
DIAG POS PART NUMBER DESCRIPTION B B C D D A A A A A A A A D D D D A A E 23 313010060681 23 313010010131 42 313010060151 160 312807801731 160 313010867600 1001 313914712951 1001 313914712881 1015 242254941512 1015 242254941492 1015 242254941502 1015 242254941482 1032 242254940095 1033 242254903572 1500 242208610536 1540 242208610417 1540 313010080072 1540 425016313493 1679 313010080076 1685 313010070044 1750 313010080076
CON CRT SOCKET 14"/17" MINI CTS CON CRT SOCKET 20/21" NARROW CON HEADPHONES EHT CABLE 14" EHT CABLE 20" TUNER UV1315AS/I-2 TUNER U1343AS/I SAW FILTER G1963M SAW FILTER J1981M SAW FILTER G1984M SAW FILTER J1952M CER TRAP 5,5 MHZ CER TRAP 6,0 MHZ FUS CRIST 2A 250V 5X20 FUS IAC 630MA FUS IAC 1A FUS IAC 2.5A CER CRISTAL 12 MHZ IR RECEIV. TSOP1836SS3V XTL 24.576 MHZ
CTU-AA CHASSIS
RESISTORS
ESPEC 14"/17" 20"/21" 14" 20/21" HYPER UHF BG MONO PAL I Stereo PAL BG Stereo PAL I BG PAL I SAF DIAG POS A C C B B B B B D B D D D D MONO 14" MONO 20"/21" STEREO D D D D D Stereo D D 3030 3189 3190 3203 3205 3216 3226 3229 3235 3236 3238 3238 3444 3449 3450 3452 3453 3457 3457 3470 3501 3504 3525 3530 3704 PART NUMBER 230620403108 230620703108 230620703108 212010308152 230620703519 212010308152 212010308152 212010308152 230620403108 212010308152 230620403108 230620703208 232219533562 230620703108 230620703108 230620703108 230620403478 230620703279 230619703479 230620403478 232266296626 232224213106 230620403159 232219533478 230620403109 DESCRIPTION
RES NFR25 1R 1/3W PM5 RES NFR25H 1R 1/2W PM5 RES NFR25H 1R 1/2W PM5 RES CARNCO 1K5 1/2W (KAMAYA) RES NFR25H 51H 1/2W PM5 RES CARNCO 1K5 1/2W (KAMAYA) RES CARNCO 1K5 1/2W (KAMAYA) RES CARNCO 1K5 1/2W (KAMAYA) RES NFR25 1R 1/3W PM5 RES CARNCO 1K5 1/2W (KAMAYA) RES NFR25 1R 1/3W PM5 RES NFR25H 2R 1/2W PM5 RES FLM PR03 5K6 3W RES NFR25H 1R 1/2W PM5 RES NFR25H 1R 1/2W PM5 RES NFR25H 1R 1/2W PM5 RES NFR25 4R7 1/3W PM5 RES NFR25H 27R 1/2W PM5 RES PR01 47R 1W PM5 RES NFR25 4R7 1/3W PM5 RES PTC 18R 270V 2K RES VR37 10M 1/2W PM5 RES NFR25 15R 1/3W PM5 RES PR03 4R7 3W RES NFR25 10R 1/3W PM5
ESPEC
SAF
14/17" 20/21"
CAPACITORS
DIAG POS PART NUMBER DESCRIPTION D D D D D D D D D D 2445 202055890333 2446 222237682912 2446 222237682822 2450 313010080055 2500 313010080071 2502 202055890282 2504 202055890282 2505 222205758689 2506 313010080068 2510 202055890337
CAP CERPL 220P 1KV CAP POL 9N1 1KV6 PM10 CAP POL 8N2 1KV6 PM10 CAP POL 470N 250V 5% B32653 CAP MKTX2 470N 275V A.C. CAP CERPL 2N2 1KV (MURATA) CAP CERPL 2N2 1KV (MURATA) CAP ELECTR 68U 385V PM20 CAP CER Y2 3N3 250VAC PM20 CAP CERPL 1N 1KV (MURATA)
D ESPEC 20" 14" SAF D D E
COILS AND TRANSFORMERS
DIAG POS PART NUMBER DESCRIPTION ESPEC SAF
D D D D D
5441 5445 5445 5480 5500 5500 5525 5525
311233830882 313010831081 313010831050 312813831292 312233831732 311110835001 313010831100 313010831090
LINE DRIVER TRAFO U10 3 IND LINE TRAFO LOT 20-21" CTU/CTS 20/21" IND LINE TRAFO LOT 14" CTU/CTS IND LINEAR AT4042/90C MAINS FILTER 20" MAINS FILTER 14"/17" IND SOPS TRAFO CTU STEREO IND SOPS TRAFO CTU 14" 20"
14"/17" 17/20/21" 20/21" 14"/17" STEREO NO STEREO
SEMICONDUCTORS
DIAG POS PART NUMBER DESCRIPTION D D D D D D A C A A E C C C A D D A A 6447 933741030133 6450 933500180153
DIO BYD33M DIO BYW32
D ESPEC SAF D D STEREO NO STEREO STEREO NO STEREO
6450 313010070410 DIO BYT42M 6530 933500180133 DIO BYV 95C 6540 933500180143 DIO BYV98-200 RASTER 12,5X7 6540 313010070410 DIO BYT42M 6602 933676010673 6663 313010070023 7015 7015
DIO HZT33 LED B4-B4534 ROJO
CAP CER CAP ELECTR CAP MKTX2 CAP POL
CERAMIC CAPACITOR ELECTROLYTIC CAPACITOR INTERFERENCE SUPPRESSION CAPACITOR X2 POLYESTER CAPACITOR COMPOS. CARBON RESISTOR FUSE RESISTOR 1/3W FUSE RESISTOR 1/2W POWER METAL FILM RESISTOR 2W HIGH VOLTAGE RESISTOR
935265522132 IC TDA9350 935265522142 IC TDA9380
PAL TXT PAL NO TXT STEREO MONO 14/17" MONO 20"/21" STEREO 3502
RES CARNCO RES NFR25 1/3W RES NFR25H 1/2W RES PR02 2W RES VR37
7101 935261354112 IC TDA9875A/2 7187 935262851112 7187 935262854112
IC TDA8941P/N1 IC TDA8943SF/N1
7187 935262855112 ID TDA8944J/N1 7401 935262851122 IC TDA8357J 7445 933760560127
TRA BUT 11AF
NEW COMPONENTS RESPECT CTN-BB AND CTS-AA CHASSIS
7514 935265522172 IC KA5Q0765RT 7605 933828890215
TRA SMD PMBT2369
7685 932A06715712 IC ST24C04D EEPROM
10.2 Mechanical, chassis and switches
CTU-AA CHASSIS
POS.
A B C D E F G H I J
DESCRIPTION
FRONT CABINET BACKCOVER MAINS KNOB KNOB ASSEMBLY SENSOR COVER OWNER'S MANUAL MAINS SWITCH MICRO SWITCH MAIN PANEL CRT PANEL
SAFETY
POSITION
*
SCREEN
*
TV MODEL
*
COLOUR
NG -BLACK BL- WHITE GR-GREY MA- IVORY GO- DARK GREY VE-GREEN RS-PINK RJ-RED AZ-BLUE
HOW TO ORDER EXAMPLE : FRONT CABINET OF TV700TX COLOUR BL UE: A * 14 * TV700TX * AZ
ANNEX TO SERVICE MANUAL (CHASSIS CTU-AA) FOR MULTISTANDARD TV SETS
Multistandard TV is achieved by means of small changes in CTU-AA chassis: - To decoder secam signals, small signal IC (7015 diagram A) is changed to TDA9351 for TXT models and to TDA9381 for no TXT. - To have a specific software for multistandard set in t