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Troubleshooting
5. Troubleshooting
5-1 No Power
No Power
OFF
Check LED when AC code is plugged.
ON Check IC802. Abnormal
Abnormal
Check Fuse.
Normal
Check/Replace IC802, R812, D856.
Check and Replace D807 ~D810
Check IC801* Pin 1 Oscillation. Abnormal
Abnormal (0 ~ 15V)
Check IC801 Pin 3 B+.
Check/Replace D806, Q401, Q801, D802, D814* Abnormal (0V)
Normal (15~20V)
Check IC801* Pin 4 Voltage
Normal (0.5 ~ 3V)
Check/Replace PC802, DZ807
Check/Replace DZ802, DZ803, D806
Samsung Electronics
5-1
Troubleshooting
5-2 No Sound
No Sound
Normal
Check Connector CN601 and CN701.
Abnormal
Abnormal
Check Waveform of IC601 Pin 1.
Normal
Check CN601 and CN701 Connector Soldering and A/V PCB.
Normal
Check Waveform of IC201 Pin 52.
Abnormal
Check Waveform of IC601 and IC602 Pins 4. Abnormal
Normal
Ok
Check Waveform of IC201 Pin 1. Abnormal
Normal Check Voltage of IC601 and IC602 Pin 5. Check SIF (L201). Abnormal Check Power 12V Line Voltage. Replace IC601 and IC602. Normal (approx. 12V)
Volume Up. NG Check/Replace IC201.
O.K
5-2
Samsung Electronics
Troubleshooting
5-3 Horizontal Line Appears
Single Horizontal Line
Normal (24V)
Check 24V-C Voltage.
Abnormal
Abnormal
Check Waveform of IC201 Pins 22,24.
Check FBT Pin 2 (24V) Oscillation. Normal
NG
Check Whether O.K a horizontal line appears in Normal the service mode.. NG Check/Replace IC201. Check/Replace IC301.
Check R409 Open. Open Check/Replace R409.
Check/Replace FBT.
Samsung Electronics
5-3
Troubleshooting
5-4 No Signal
No Signal
Abnormal
Check each tuner terminal voltage.
Normal
Check voltage line.
Abnormal
Check tuner SCL,SDA waveform.
Normal
Check Micom IC901.
Normal
Check tuner IF terminal waveform. Abnormal Replace tuner.
Check IC201 Pins 7,8 waveform.
Check IC201 Pin 41 waveform level.
Normal
Check whether AGC and AFTadjustment are normal in the service mode.
Normal (2Vp-p)
Check IC201 Pin 43 waveform level.
Abnormal
Normal Abnormal
Check IC201 Pin 47 waveform level. Readjust AGC and AFT.
Normal (1Vp-p)
Check IC201 Pins 19,20, 21 waveform level.
Abnormal
Normal (2Vp-p)
Check IC201 Pin 37 waveform level.
Normal (3~5Vp-p)
Replace IC201. Check CRT PCB (180V) and heater Voltages.
Normal (1Vp-p)
5-4
Samsung Electronics