Samsung TXJ2766 Service Manual - Page 21

No Raster and No Sound

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

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