Solved 39Ln5300 With Black Screen No Image With Flashlight Lg Television

Chosen Solution

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? Thanks.

Hi @ribertgropius , Here’s the power-up boot check troubleshooting flowchart from the service manual for the TV. This should help you to find the problem