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7-4 No Video
Power indicator is green
Does DC 12 V appear at
Pins 16 and 5 of IC101?
Yes
Does the video pulse
appear at Pins 4, 6 and 8
of IC101?
Yes
Does the video pulse
appear at Pins 13, 17 and
32
19 of IC101?
Yes
Does the video amplified
pulse appear at the Pins
8, 9 and 11 of IC102?
Yes
Does the video amplified appear
at the Pin #1, 3 and 5 of IC102?
Yes
Does the right R, G, B waveforms
appear at the disconnected
33
Video PCB from CRT?
Yes
Check screen VR of FBT and G2 Pin.
CKE5507L/LM
No
Check Q605, Q606 and D621~D623.
No
Check signal cable
and signal source
No
Does the clamp signal
11
appear at Pin 37 of IC202?
No
Does the DC voltage appear
at pin 9 of IC 101?
No
Check IC101
Check IC101.
No
Check CRT.
11
CH1 P-P = 4.52 V
32
CH1 P-P = 3.92 V
No
Yes
No
Yes
33
CH1 P-P = 40.8 V
7 Troubleshooting
WAVEFORMS
4.52 V (IC202, #37)
CH1 RMS = 4.284 V
3.92 V (IC101, #19)
CH1 RMS = 3.536 V
Check clamp circuit on
the Main PCB and
IC202 (pin #37).
Check contrast control
circuit (on the Main
PCB)
40.8 V (IC102, #1)
CH1 RMS = 27.10 V
7-3
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