Troubleshooting - Samsung CT25D4WZX/GSU Service Manual

4. Troubleshooting

4-1 No Raster and No Sound
Check/Replace
IC801 Q801
Check/Replace AVR
Circuit, Horiz Output
Circuit and B+
Voltage Line.
Open
Check/Replace
1) D801
2) Short the
Degaussing Coil
3) C801
Samsung Electronics
No Raster and No Sound
No Voltage
Voltage at the Cathode
Normal
Check/Replace F801
Normal
Check/Replace
the power switch
Measure the B +
of D812 (D811)
Normal
Check +12.5 Line
More than 130V
Measure the B+
Normal
voltage at the cathode
Check/Replace
Check/Replace FS
circuit
(ADJ Pin of STR)
Abnormal
Check the horiz
output signal at TR
of D812*
More than 130V
Check/Replace
AVR circuit
the AVR circuit.
Troubleshooting
collector.
Less than 50V
4-1