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6 Fault finding, Block diagram L7.2E 13
6 Fault finding, Block diagram
SWITCH - ON
THE TV. SET
1 3 1 5
No picture No picture No picture
No Sound No Sound Sound OK
Reaction on RC Reaction on RC
Yes
Peak voltage
at pin 6 IC7520 [A1] Over voltage protection
LED
>2v5?
Yes Continuously
ON ? No
No
Set in "Stand-by" or Check: Voltage
No
"Protection mode". "Take-over circuit" at pin 14 IC7520 [A1]
D6540, L5540 [A1] <2v5? Voltage
+13V, -13V (Lot) No
LED Blinking? is OK ?
Check: Yes
(not error codes) No
Stand-by circuit
Check:
+13V (LOT), IC7541
+8V, VFL, Flyback Check: - R3451 [A2]
Check:
No "Feedback loop" - R3449 [A2]
"Primary circuit sensing
D6537, R3541 [A1] Yes
LED reaction on RC Yes
Check:
Heater voltage [A2]
Check: Check:
No
Horz. cicuit +8V supply
FM / CVBS
Set in Hick-up
Yes
mode? Check:
D6445 [A2]
Check: TS7445 [A2]
TS7445 on Shortcircuit [A2] No FET7518 [A1] Vertical defl. problem
D6445 [A2] Check:
FET7518 [A1] IC7401 [A2]
Voltag on C2508 [A1] No
present?
Yes
Check:
Check:
TS7518 [A1]
+5V (supply control)
R3500 [A1]
FUSE Item 1560 [A1]
FUSE Item 1500 [A1]
Voltage at pin 1
1 4 1X 1 3 1 6 1 3 1 7 1 3 4 1 1 3 1 4 IC7520? [A1]
No
Check:
Yes
R3510 [A1]
D6510 [A1]
IRIS repair code
B/W Snow white
. . . .
Pulses at pin3 Yes
IC7520? [A1]
Extended symptom code
Check: Check: Check: Check: Check:
86532008_001.AI
C 2205 [A3] Horzontal Vertical Tuner +160V
Main symptom code
No Check:
R 3234 [A3] Defl.circuit Defl.circuit Voltage R3470 [A2]
R 3254 [A3] D 6441 [A2] IC 7401 [A2] Pin 6 [A3] R3525 [A1] Condition code
070498
D 6560 [A1] D 6445 [A2] +9V R3517 [A1]
Replace IC7520 [A1]
IC 7541 [A1] TS 7445 [A2] FET7518 [A1]
6 Fault finding, Block diagram L7.2E 14
DIFFERENT AUDIO -SYSTEM PANELS
A4 CONTROL C1 A5 SOUND-PROCESSING VIDEO-INTERFACE SOUND-INTERFACE MULTI - MONO C
M 11 0033
1 1 42 52 +5 VD SCART
21 (A4 - 37) LEFT_OUT 1 1
2 2 41 51 A5
(A3 - 33) V-TUNE
C2 C3 (A3 - 12) 20 (A4 - 38) RIGHT_OUT 2 2 MULTI MONO C
3 3 40 50 SDA
(A3 - 21) 19 CVBS EXT1 (A3-18) M 11 0033 A5
(A3 - 34) 18 3 3 1501 7501-2A 7505,7507
(A5 - 51) VOLUME (A3-29) CVBS - OUT
4 4 39 49 SCL 17 (A4 - 40) SCL 4 4 7501-2B 0130
0030
(A5 - 43) MONO / STOBE / BG-L (A3 - 13) A5
16
~
7620 0025 (A4 - 39) SDA 5 5 AM
5 5 38 48 SERVICE (A3 - 22) 15 BL TXT1 OSD (A3-27) M9 0022
~
(A5 - 36) BG / L - or -BG / DK +8V 6 6 DET. 8
EEPROM 0024 14
~
6 6 37 47
SDM (A3 - 40) (A3-26) R TXT OSD +8V
(A5 - 23) BLACK - STR - SW MODE 13 (A3 - 34) CVBS_SOUND 7 7
7 7 36 46 12 MOD_R_IN2 8 8
(A5 - 52) SID / STA / LL CHROMA-2 / STATUS (A3 - 80) 11 A5 D
8 35 45 RC5 10
9 9 7511,7514 NICAM
8 REMOTE (A3-25) G TXT OSD M 11 0033 A5
(A5 - 48) INT / EXT 1670 9 MOD_L_IN2 10 10
9 9 34 44 RECEIVER (A4-80) 0130
(A5 - 45) AV 1 - AV 2/ AVL +5 VD 8 11 11 A5 0030
7 CHROM2-STATUS (A3 - 31) IF 12
10 10 33 43 C6 6 M9 0022
(A5 - 49) TREBLE RESET (A1 - 2) (A3-24) B TXT OSD MOD_L_IN1
7603 (A4 - 43) MONO/STROB/BG-L 13 13
11 11 32 42 5
(A5 - 50) BASS 7601 4 L - EXT 1 14 14
X - TAL
12 12 (NONTXT) 31 41 12M HZ 3 (A4 - 45) AV1/AV2/AVL 15 15
48K (A5-37) LEFT OUT 2 MOD_R_IN1 SIF/FM 16 16
13 13 30 40 1
MOD_R_IN1 17 17
29 39 (A5-38) RIGHT OUT
7681 MOD_L_IN1 18 18
14 STANDBY (A4 - 54)
L OCAL 15 28 38 NC 19 19
KEYBOARD 16 7402
27 37
VFL (A2 - 9)
M9 0022
7508,7510 TDA7056B (3WATT)
17 17 26 36 A5 55 A3
(A3 - 43) BS 1 FLYBACK (A2 - 10) BASS
18 1 3
18 25 35 7225_6F
7225 - 5E 1
TRBLE
6
(A3 - 43) BS 2 BL _ TXT _ OSD (A3 - 27) 0130 0030
(A3 - 35) CVBS - SOUND
1101 +10V/14V 2 2 AUDIO OUTPUT
19 19 24 34 3141 +13V/+9V PROC.
(A1 - 3) STANDBY R _ TXT _ OSD (A3 - 26) 1 FM
(A4- 48) INT/EXT 3 3 AMPLIFIER 8 +R 1 1
(A4 - 54)
LED 20 20 23 33
G _ TXT _ OSD (A3 - 25)
~
~
AUDIO
DET 15 (A4- 49) TREBLE 4 4 -R 2 2
0088
~
21 21 22 32 (A4- 50) BASS 5 5 EARTH 3 3 4
B_ TXT _ OSD (A3 - 24) 16 /3W
22 (A4 - 36) BG/L - D - BG/DK MONO_OUT 6 6 5 +L 4 4 HEAD PHONE 3
0028 31 CONN
SERVICE 2 (A4- 51) VOLUME 7 7 -L 5 5 2
SAM
23 30