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7-2-16 No Video Continued
Is IC101's output on Pins 18,
15
21 and 23?
Yes
Is IC102's output on Pins 1,
16
3 and 5?
Yes
Are there waveforms on SK103's
R, G, B?
No
Disconnect Video PCB from CRT neck.
Are ther waveforms on
19
SK103's R, G, B?
No
Check and replace Q101R, Q101G,
Q101B, Q102R, Q102G, Q102B,
D103R, D103G, D103B and
PCB pattern.
WAVEFORMS
15
3.16 V (IC101, #21)
CH1 P-P = 3.16 V
CH1 RMS = 1.008 V
CHA42*7L/5**7L
No
No
Yes
Yes
16
43.2 V (IC102, #3)
CH1 P-P = 43.2 V
CH1 RMS = 63.56 V
Is clamp signal on IC101's
18
Pin 12?
Yes
Refer to 7-2-15 ABL Failure.
Replace IC101.
Is 75 V on IC102's Pin 6?
Yes
Replace IC102.
Check again cont, brit key.
6.3 V line, G1, G2 line.
Is it ok?
Yes
Check and replace SK103 and CRT.
18
5.60 V (IC101, #12)
CH1 P-P = 5.60 V
CH1 RMS = 4.908 V
No
No
19
46.4 V (SK103, G)
CH1 P-P = 46.4 V
CH1 RMS = 38.16 V
7 Troubleshooting
Check and replace
IC202 and around it.
Check 75 V line.
7-19
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