LG Repair Guide; After the TV is turned on, there is no raster, no sound, no image 56

After turning on the LG TV, there is no raster, no audio, and no image.

Analysis and Maintenance: It is estimated that the fault lies in the power circuit. The following two parts should be checked carefully.

(1) Power-on supply resistor R902 in the power circuit.

(2) Voltage regulation feedback circuit.

First, check that R902 is in good condition, then inspect the voltage regulation feedback circuit including SE140, STR6309, and overcurrent sampling resistors. The check reveals issues with SE140 and STR6309.

Repair Method: Replace STR6309 and SE140 to eliminate the fault.

Source of Article: http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3701288.