This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.

Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....

Samsung UN50KU6300 dead no standby led

01-04-2024, 01:33 PM
Greetings to all, a while ago my TV was dead, it didn't turn on and the standby light was off, the next day it is working. But these days it no longer wants to turn on, I did some troubleshooting, I disconnected the main board, I checked the voltage on the backlight and there is 400 DC, when I connect it again the main board the voltage drops, in all that troubleshooting, miraculously the standby light comes on and the TV works. After an hour I check and test, I turn on the TV, the Stanby light flashes 3 times and it...

Hello everyone,
I’m looking for help diagnosing a no-power issue on an ASUS ROG Zephyrus G14 (GA402R / GA402RK series). ❗ Problem


The laptop does not power on at all:

• No LEDs
• No fan spin
• No response to power button

The issue started right after a RAM upgrade. The previous owner mentioned there may have been static discharge during reassembly.

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🔍 What I have checked so far (with a multimeter)

• AC adapter is confirmed working
• 19–20V is present at the DC jack
• Both input MOSFETs have 19–20V on both sides
• Multiple inductors near the eDP connector

...

I've owned this C1 from new since late 2021, and it has now suddenly started with the following symptom:
If power has been connected for a while, the red standby lamp turns off, and the tv wont turn on (no reaction from remote or button on tv).
If power has been disconnected for 5 minutes, the tv turns on fine, until turned off and left for a couple minutes, as the standby light will then turn off again.

I've seached and found that this is most likely a failing PSU, and I've seen repair services on eBay fixing these symptoms, so I am hoping that someone here has fixed...

vizio e650i-a2 (LWJAOZBP Serial) led backlight flashes then turns off, has video (via flashlight) and audio.

panel: au optronics T650HVN05.4
72 led total on 12 strips, 6 led per strip wired in three groups of 24 (led driver board has three anode and three cathode pins)
link to datasheet: https://datasheetspdf.com/pdf-file/8.../T650HVN05.4/1

Vizio 56.04219.641G (liteon PA-3231-01WN-LF) Power Supply Unit
https://www.shopjimmy.com/vizio-56-0...-power-supply/

Vizio 55.75J01.001G (91.75J10.004G) Main Board...