Troubleshooting
5-4 No Signal
No Signal
Check
AbnormalNormal
each tuner terminal
voltage.
Check voltageCheck
AbnormalNormalline.tuner SCL,SDA
waveform.
Check
CheckNormal
tuner IF terminal
Micom IC901.waveform.
Abnormal
Check
IC201 Pins 7,8
waveform.
Replace tuner.
Normal
Check IC201 Pin 41
waveform level.
Check
whether AGC and Abnormal
Normal (2Vp-p)AFTadjustment are normal in
the service mode.
CheckNormal
IC201 Pin 43 waveform
level.Readjust AGC
Checkand AFT.
AbnormalIC201 Pin 47
Normal (1Vp-p)waveform level.
Check
AbnormalNormal (2Vp-p)IC201 Pins 19,20, 21
waveform level.
Check IC201
Normal (3~5Vp-p)Pin 37 waveform
level.
Check CRT PCB (180V)Replace IC201.
and heater Voltages.
Normal (1Vp-p)
5-4Samsung Electronics |