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and overviews
6 Fault finding trees, diagrams and overviews A8.0A 17
6 Fault finding trees, diagrams
Mains startup
FAULT FINDING TREE LSP A8 CHASSIS
switch on the set
LED LED LED in
lights ? Yes blinking No STBY ? No
No Yes Yes
Error 1 Check TS 7909 LED ok LED ok LED ok
Power supply Protection mode Check uP pin 19 Control ok Control not ok Picture ok
No Control ok
is hicking ? Picture not ok Picture not ok
Sound not ok Sound not ok Sound not ok
See flowchart
"SOUND NOT OK"
Yes
Any secondary size >21' No
Yes voltage present?
Check T7620, LOT, other
parts in EHT circuits Yes Check +8V on
BIMOS 2
Check
No
+5VD desolder E61 pin
13 or M61 pin 13
E-W fault
PIN 4 of * check hor. defl.coil
Yes IC7902 shows: * check L5621 lin.coil
* check C2629/2630 1 1 D 3 1 0
S-corr. cap.s
2,5V DC/div * check C2613/2625 White screen LED ok
Replace 200ms / div flyb. cap.s No still protection with flyback lines
No Control ok
IC7902 * check D6621 and after a while Black screen Sound ok
P6 POWER * check EW transformer set-off and ? Picture not ok
L5624/5625 or 5680/ protection mode See flowchart
PIN 4 of 5682/5683 (version Yes "PICTURE NOT OK"
Yes IC7902 shows: dependent)
* check T7680
Remove
Check feedback 5V / div AC D6739
circuit: No 0.2ms / div check
7950, IC7904, 200 V No 200V ok 3 4 5 6 7 8 9
R3926 supply
1. check Mains circuitry
2. check 5VSTBY supp. Remount
3. check uP pin 20 No still protection D6739 No still protection Yes
4. check P16 Remove T7748
See Power Supply repair
method check filament
remove CRT panel Fillament ok No supply
Yes Yes
Vertical deflection fault Remove T7909
Check IC7700 Desolder pin 3 Yes
1 +13V,+20V,-13V of LOT
Check VBAT CRT Still protection
Power supply No See flowchart
defective mode ?
repair method "No Picture"
Yes
Power supply fault
secondairy side No VBAT = 141V
?
3
Fault in antispot circuit check CRT panel
* check T7743/7745/ Yes
. . . IRIS symptom code
7748
*check +14V
Check T7620, LOT, other
parts in EHT circuits CL 86532034_006.AI
120698
6 Fault finding trees, diagrams and overviews A8.0A 18
POWER SUPPLY REPAIR METHOD SOUND NOT OK PICTURE NOT OK
1 2 3 4 5
Power Supply Coloured picture
Sound not OK No picture Blue picture
Repair Method with fly back lines
Check mainsfilter, Error 5 Check TS 7800 - Check TS 1189/1190/1192
Check R3959
F1900 or IC 7150 TS 7189 -TS 7193
Error 14 Yes Check IC 7430 No
Error 6
No Yes
Check bridge D6903/
Check IC 7907 pin 1
6930, 6931, 6932, 6933
Check IC 7150
Measure +15V Check 15V
No
on 3 IC 7550 Power supply circuit
Check 16V on P3 Check IC 7907 pin 7 Yes
Sound signals Check 15V Check Check 200V
on TP5 A5a -A5b Yes No
loudspreaker +200V Power supply circuit
A6a-A6b
Check IC 7902 pin 2-3 +5VSTBY
OK Yes
? No Yes
No Voltage Check mute circuit OSD is working Measure voltage
11 IC 7550 No No
Check R3924 TS 7551/7552 ? e - TS 7745
= 16V
Isolate +5VSTBY
Yes Yes
LED is Check circuit between Voltage Check circuit
Sound signals No TS 7743 - TS 7745
No flickering in a low * Check load 6 IC 7150 - 13 IC 7150 0.7V
on TP5 Yes Check IC 7550
frequency? +5VSTBY * Check controls
Yes diagram A8 A4a-A4b
OK
? * Check front control
diagram A15 Yes
Yes No
No
Interrupt
Check R3959 R3312
Sound IF inputs Yes Check IC 7430
IC 7907 defective on TP5
A1/A2
No
Primairy circuit Signal present
OK Yes Check CRT
V14a/V14b/
Check IC 7150 V14c
No
Signal present
Yes Check IC 7830
V12a/V12b/
V12c
No
Check IC 7150
CL 86532034_007.AI
250598
6 Fault finding trees, diagrams and overviews A8.0A 19
PICTURE NOT OK
6 7 8
Noisy Picture No OSD No TXT
In CSM - Retune transmitter Check TS 7075 and V Sync and CVBS
H Sync on 37 and Check TS 7176
"not tuned" Yes - Check aerial TS 7070 and V and No on TP V5 No
36 - IC 7000 IC 7150
message - connection HFB signals present
present
No Yes
Yes
H Sync on Check TS 7070 and
Error 16 Yes Check tuner 1125 Yes 36 -IC 7000 No HFB signal
present
No
RGB on TP
No Check IC 7000
T1a/T1b/
Measure voltage T1c
6 - 1125
Yes
RGB on TP
No Check IC 7275
Voltage V10a/V10b/
No Check +5V supply V10c
= 5V
Yes
Yes
Check IC 7150
Measure voltage
9 - 1125
Voltage No Check 33V supply
= 33V
Yes
Measure voltage
1 - 1125
Voltage No Check tuner 1125
= 2V2
Yes
Check IC 7150
CL 86532034_008.eps
240698
6 Fault finding trees, diagrams and overviews A8.0A 20
IIC Diagram
2091 2090
+5VD
3094 3093 3336 3335 3130 3129 3431 3430 3421 3430 1
2
3003-B 3003-C 4434 4430 3
50/SDA 49/SCL 8/SDA 7/SCL 5/SDA 4/SCL 26/SDA 27/SCL 10/SDA 9/SCL
1
7000 2 7150 1125 7437 7430
3
Micro Processor Video Processing Tuner BTSC Stereo NICAM/2CS/FM/AM
P87C770/SAA5xxx 5 TDA8844 TDA9855 MSP3410D
M07
11
M28
A5
48/SDA_EEPROM 47/SCL_EEPROM
A7 RGB PROCESSING A5 TUNER + VIF A10 AUDIO PROCESSING A11 AUDIO PROCESSING VIDEO PROCESSING
3003-D 3003-E
3092 3091
+5VD
2086 2085
5/SDA_EEPROM 6/SCL-EEPROM
7088
3333 3332 1
NV Memory 2
ST24W16B6 3
14/SDA 11/SCL
7770
A8 CONTROLS YUV Processing
TDA9178
11
Y28
R YUV Panel
3130 3129 3353 3352 3102 3101
5/SDA 4/SCL 4/SDA 3/SCL 8/SDA 9/SCL
1 1 1
1126 2 7350 7101 2 2
3 3 3
2nd Tuner AP YC Processing OSD Processing
TELH9-205A 5 MC44462 PCA8515P 5 5
P07 O07 O08
T1 YC PIP Panel T2 YC PIP Panel S OSD Panel CL 86532034_009.AI
020698
6 Fault finding trees, diagrams and overviews A8.0A 21
SUPPLY VOLTAGE DIAGRAM
9918
A1 16 9917 VBAT HOR. DEFL. + A2 9612 VBAT_2 A2 EHT PICTURE
17 LINE OUTPUT TUBE
3994 +33V A4 +33V 2M10 2P10 I
TUNER + VIF YC PIP FOCUS
VG2
B
A-D B
DW PANEL 3643 2M60 2C60 3840 +200V A CRT PANEL
A4 FF 4M60 4C60
13 9949 +8V 4M10 4P10 +8V T
7908 A1 YC PIP 9666 9668
+13V_SCAVEM +13V
1905
1M60 1C60
VERTICAL A3 (HIGH BEAM A2
DEFLECTION PROTECTOR)
3290 3660/3661 +13V_+20V
RGB A7 L.O.T. VERTICAL A3
+8V B
PROCESSING 3663/3664 -13V DEFLECTION
QSS DK J
3162
9669
+8V B PANEL
A4 1M11A 1Q11A
TUNER + VIF
+13V
+8V I C
H QSS PANEL EW PANEL
+8V B
M15 From
A6
+8V SYNC
MAINS
FILTER
S.M.P.S.
PANEL VERTICAL A3
F DEFLECTION
5M24 5I24 +8V A I/O CINCH
PANEL
3464 AUDIO A11
7431 A10 +8V SOUND PROCESSING
VIDEO A5 4M28 4Y28 R NICAM/2CS/FM/AM
YUV PANEL
PROCESSING
+8V +8V
A13 AUDIO A10 SOUND 3M42 N423 SOUND INCREDIBLE Q
PROCESSING
3250 +8V A A13 BTSC SOUND
I/O
SWITCHING
A8
5090 +5V D +5V D A15 5630
CONTROLS FRONT
CONTROL
14 1906 A1 +5V STBY
RGB A7
PROCESSING
7907
+5V A8 4M07 4G07 S +5V 4O08 4J9Q2 DOUBLE
CONTROLS OSD PANEL
WINDOW
A4
5100 +5V A A4 +5V A1M11B 1Q11B I 4O08 4P07 +5V YC T
TUNER + VIF QSS PANEL
PIP
5430 +5V SOUND AUDIO A11 QSS DK J
PROCESSING
PANEL
NICAM/2CS/FM/AM
A4
5M25 5B25 +5V D
COMB G
5000
FILTER
+5V
10 D6918 +15V AUDIO A12 2M55 SUBWOOFER
OUTPUT BOX
+14V VERTICAL A3
DEFLECTION
CL 86532031_004.AI
290598
6 Fault finding trees, diagrams and overviews A8.0A 22
BLOCKDIAGRAM LARGE SIGNAL PART
CHASSIS A8.0
86532026/012,X001
160798
6 Fault finding trees, diagrams and overviews A8.0A 23
BLOCKDIAGRAM SMALL SIGNAL PART
86532026/014.X001
160798
6 Fault finding trees, diagrams and overviews A8.0A 24
A1 A6b C14 I3 L12 P12 5V DC V4 V10a TXT on V13a
P13 5V DC
P13 5V DC L12
P14 16V DC
0.5V / div AC 2V / div AC 1V / div DC 0.5V / div DC 1V / div DC 0.5V / div DC 0.5V / div AC 0.5V / div DC
1ms / div 0.2ms / div 20