Re: LG 50UH5530 LED TV suddenly won't power up

After more attempts of trying to find fault with the power board or main board, I decided to dismantle the TV further to test the LED strips. This seemed to be a possible point of failure since the screen would power up for less than a second then go black.

Upon testing the strips, one LED strip would light up then fade out completely. I replaced this strip, and now the TV is working properly again.

Thanks for the assistance.

Re: LG 50UH5530 LED TV suddenly won't power up



After connecting the STB and 13.2 pin with all connections to the power board unlogged except the the AC power, every 13.2V pin reads 12.96V....

Re: LG 50UH5530 LED TV suddenly won't power up



I apologize for my ignorance, but I am still unclear on what I need to do to "force on" the power supply with the main board disconnected....

Re: LG 50UH5530 LED TV suddenly won't power up

However, in standby, the STB pin gives 0V. I was under the impression that it should be around 3.3V or 5V, depending on the board. Does this mean the issue is with the power board and that it simply needs to be replaced?

Re: LG 50UH5530 LED TV suddenly won't power up




1) In standby, the 13.2V pins have been sitting steady at 9.9V.

3) In the last power up, I heard no ticking sound coming from the power board as before.

4) I do not know how to perform what you are requesting in step 4.

5) I will upload pictures of the face and backside of the board as soon as I am able. It seems as though the pictures previously have not been of sufficient quality, and so, I am afraid that the future pictures will be no better.

6) I...

Re: LG 50UH5530 LED TV suddenly won't power up

Those readings were taken with all connectors in place. After testing, I unplugged the TV, then disconnected the main board connector, and tested all pins again. When testing with the main board disconnected, the 13.2V pins gave a reading of about 9.9V, and all other pins remained the same. Getting 0V on the STB pin seems odd.

After removing the LED connector, the pins did not appear to change voltage at all.

The ticking sound is coming from the power board.

I took one close up photo of the...

Re: LG 50UH5530 LED TV suddenly won't power up

I attached a more clear photo near the main board connector. This one seems less blurry. The values of the 12 pins are below. All 13.2 V pins gave values among the range listed by each.

ODD
ENA => 0 V
GND => 0 V
13.2V => 7.4 -10.11 V
13.2V => 7.4 - 10.11 V
GND => 0 V
STB => 0 V

EVEN
ADJ => 0 V
...

Re: LG 50UH5530 LED TV suddenly won't power up

I included a closer view of the power board halved in two separate photos in addition to a photo depicting the entire board....

The TV was working properly, then after powering off for about 2 hours, the TV will not power up. The standby light is on, and solid as usual. When powering on, the screen will light up for about 1 second, then shuts off, and the standby light comes back on. When attempting to power on a second time, the screen does not flash, but the standby light flashes 3 times, then goes back to solid. Unplugging the TV for about 30 seconds will allow the replication of these events exactly.

When testing the Power board, the standby output lead shows zero voltage rounded to a hundredth. All capacitors...

Re: New Members - please post your introductions here

Hello,
Just here hoping to learn from those more experienced.