Samsung PS42P2SDX Troubleshooting
Troubleshooting
Samsung Electronics 6-1
6. Troubleshooting
6-1 Entirely no screen
Remove SMPS output connector
(connect Video B d only)
Normal
Power on
Normal
SMPS Output
Voltage
Normal
Logic Connect Power
LED Light-on
(Power, Sink)
Normal
X-B d Connect Power
Abnormal
Abnormal
Abnormal
5V Output
Abnormal
AC Input
Normal
Replace SMPS
Replace Logic B d
Normal
Normal
Replace Video B d
Change Fuse
X-B d Output
Normal
Y-B d Connect Power
Y-B d Output
Normal
Replace Panel
Abnormal
Replace X-B d
Abnormal
Replace Y-B d
6-2 Samsung Electronics
Alignment and Adjustments
6-2 Partly no screen
Power on
Upper part no screen
No
Lower part no scree
No
1//14 Screen part
Abnormal
No
1/28 no screen
Yes
Yes
Yes
Yes
Replace Upper Scan Buffer B d
Replace Lower Scan Buffer B d
Replace Corresponding
Address Buffer B d
Replace Panel
No
1/7 no screen
Yes
Replace Panel
Troubleshooting
Samsung Electronics 6-3
6-3 Checking the Board (Unit)
6-3-1 Y buffer
- To check the main board, you have to check the Y buffer first.
- After separating Y Main and Y buffer board,
- Check the Diode between OUTL and OUTH, and make sure that the forward voltage drop is between
0.4 and 0.5V.
- Check that the resistance between the two terminals is more than several kW.
Loading...