TROUBLESHOOTING GUIDE
E-6
ONLY A LINE APPEARS
No
Is the signal at pin 47 of
IC601 normal ?
Check the peripheral circuit of IC601.
Yes
Yes
Is the signal at pin 1
of IC401 normal?
Check DY and peripheral circuit.
Check IC401 and VCC
25V line?
No
Check FB401 and peripheral circuit.
Check IC401 and peripheral circuit.
No
Yes
No
Is there a waveform at
IIC BUS line normal?
Check IIC BUS line control IC.
Yes
OSD SCREEN DOES NOT APPEAR
No
Check IC1006 and peripheral circuit.
Replace IC601.
No
Check IC601 at pins 30, 31 and 32
peripheral circuit.
Yes
Yes
Is there a waveform at pins 96,
99, 100 and 101 of IC1006 ?
Is there a waveform at pins 34,
35, 36 and 37 of IC1006 ?
Summary of Contents for VTW21FQR
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