39LN5300 with black screen, no image with flashlight
I have a LG 39LN5300, manufactured 2/2014, with a black screen, but with sound (static). I looked at trouble shooting guides and confirmed there is no image even with a flashlight. I replaced the motherboard but this did not solve the problem. Now I am suspcious of the power supply board, but would like to verify if mine is bad first. I am able to use a volt meter.
I took meter readings from the P201 9-pin plug for ribbon cable to motherboard. Next to the plug there is a chart with 2 columns of 8 numbers each:
Left column says "PWR-ON", lists bottom to top:
3.5, 3.5, GND, 24v, GND, 12V, 12V, GND
Right column says "DRV-ON", lists bottom to top:
PDIM, N.C., GND, 24V, GND, 12V, N.C., GND
Readings from bottom to top as follows:
a. Plugged in but not turned on: 0, 3.3, 3.3, 0, 0, 0, 0, 0, 0
b. Plugged in, turned on with remote: 3.0, 3.2, 3.2 0. 23.8, 0, 12, 12, 0
Can one tell from these readings if my power supply is bad?
Bu iyi bir soru mu?