7 Troubleshooting
CHA42*7L/5**7L
7-19
Check and replace
IC202 and around it.
Is clamp signal on IC101’s
Pin 12?
No
Is IC101’s output on Pins 18,
21 and 23?
No
15
18
Refer to 7-2-15 ABL Failure.
Yes
Yes
Check 75 V line.
Is 75 V on IC102’s Pin 6?
No
Is IC102’s output on Pins 1,
3 and 5?
No
16
Replace IC102.
Yes
Yes
Check again cont, brit key.
6.3 V line, G1, G2 line.
Is it ok?
Are there waveforms on SK103’s
R, G, B?
Yes
Disconnect Video PCB from CRT neck.
Yes
No
Replace IC101.
7-2-16 No Video Continued
Are ther waveforms on
SK103’s R, G, B?
Check and replace
SK103
and
CRT.
No
Yes
Check and replace Q101R, Q101G,
Q101B, Q102R, Q102G, Q102B,
D103R, D103G, D103B and
PCB pattern.
19
WAVEFORMS
15
3.16 V (IC101, #21)
CH1 P-P = 3.16 V
CH1 RMS = 1.008 V
16
43.2 V (IC102, #3)
CH1 P-P = 43.2 V
CH1 RMS = 63.56 V
18
5.60 V (IC101, #12)
CH1 P-P = 5.60 V
CH1 RMS = 4.908 V
19
46.4 V (SK103, G)
CH1 P-P = 46.4 V
CH1 RMS = 38.16 V
Содержание CHA4217L
Страница 2: ...Samsung Electronics Co Ltd August 1998 Printed in Korea Code No BH68 61127A ...
Страница 10: ...Memo 3 Product Specifications 3 4 CHA42 7L 5 7L ...
Страница 14: ...5 Disassembly and Reassembly 5 2 CHA42 7L 5 7L Memo ...
Страница 62: ...9 Electrical Parts List 9 14 CHA42 7L 5 7L Memo ...
Страница 64: ...Memo 10 Block Diagrams 10 2 CHA42 7L 5 7L ...