CKF5607L 7-1
7 Troubleshooting
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. Check the following circuits.
• No raster appears: Power circuit,Horizontal output circuit, H/V control circuit, and H/V output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
7-1 No Power
Check Fuse, D600, D602, D603
and D604.
Does proper AC 90-264 Volts
appear between the positive and
negative poles of C606?
Yes
No
Check D608, D609, D610, D611,
D612 and T601.
PWM output appear at Pin 5
of T601?
Yes
No
Check T602 and D608.
Check Power protection.
Check IC602.
AFC Signal appear at
negative pole of C612?
Yes
No
Check D615.
Check IC602.
H-Sync Pulse appear at Pin
5 of IC602?
Yes
No
VCC appear at Pin 3 of IC602?
Yes
No
WAVEFORMS
3
4
472V (T601 #5)
CH1 P-P = 472 V CH1 RMS = 372.2 V
3
3.44 V (C612, –)
CH1 P-P = 3.44 V CH1 RMS = 620 mV
4
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