TROUBLESHOOTING GUIDE
ONLY A LINE APPEARS
Yes
No
No
No
Yes
Yes
Is the normal signal at
pin 5 of IC401 input ?
Is the voltage at pin 6
of IC401 DC22.8V ?
Check peripheral circuit of IC401
and CP401.
Check peripheral circuit of IC604.
Check R409 and 9V line.
Check D411 and FB401.
Is the voltage at pin 4
of IC401 DC0.9V ?
OSD SCREEN DOES NOT APPEAR
No
Yes
No
Yes
No
Yes
Check peripheral circuit of IC604.
Is there a waveform at
pins 17, 18 and 19 of
IC604 ?
Is there a waveform at pins
44 and 45 of IC1001 ?
Is there a waveform at pins
62, 63 and 64 of IC1001 ?
Check IC1001 and the peripheral
circuit.
Check IC1001 and the peripheral
circuit.
Check pins 12, 13 and 14 of IC604
and the peripheral circuit.
E-6
