Samsung PS42S5HX/XEH - Page 105

Circuit Description
Samsung Electronics 13-19
■ Troubleshooting the Drive Board
1) Y Buffer
- To check whether the Y Main board is properly working, check the operation of the Y Buffer first.
- Separate the connector of the Y Buffer from the Y Main board
- Check OUTL and OUTH and confirm that the forward voltage reduction is between 0.4V ~ 0.5V.
UP - CN5407 1~10pin - OUTH / 11~33pin - OUTL
LOW - CN5507 50~41pin - OUTH / 40~17pin - OUTL
- In addition, the resistance between the points must be higher than a few kΩ .
OUTL OUTH
Y - B uf f e r ( L ow ) Y - B u f f er (U P )
CN5404
OU T L (1 7 ~ 3 4)
CN5504
OU T L (3 5 ~ 3 8)
OU L H (1~ 4 )
OU T L (5 ~ 2 4 )