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Troubleshooting
5-4 Samsung Electronics
5-4 No Signal
Abnormal
Normal
No Signal
Normal
Normal
Abnormal
Abnormal
Abnormal
Normal
Normal
Abnormal
Normal (2Vp-p)
Normal (1Vp-p)
Normal (3~5Vp-p)
Abnormal
Normal (2Vp-p)
Normal (1Vp-p)
Check
each tuner terminal
voltage.
Check voltage
line.
Check
Micom IC901.
Check
tuner SCL,SDA
waveform.
Check
tuner IF terminal
waveform.
Check
IC201 Pins 7,8
waveform.
Replace tuner.
Check
whether AGC and
AFTadjustment are normal in
the service mode.
Check
IC201 Pin 47
waveform level.
Check IC201
Pin 37 waveform
level.
Readjust AGC
and AFT.
Check IC201 Pin 41
waveform level.
Check
IC201 Pin 43 waveform
level.
Check
IC201 Pins 19,20, 21
waveform level.
Check CRT PCB (180V)
and heater Voltages.
Replace IC201.