Samsung TXH1370 Service Manual page 21

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