I'm kind of new to tv troubleshooting. I fixed a few but I have a sansui 42” LED tv in which the backlight shuts down whenever the backlight is any higher than 2 on the settings. This tv has a separate LED driver and inverter board. All the caps on the driver board are not bulged. I also think I read somewhere that bad led's could be the culprit but all seem to light up normal judging by the screen's appearance. Thanks in advance to anyone that may have some troubleshooting tips for me.
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Re: Sansui SLED4280
it's bad led(s) in the back light. They can fail like that. -
Re: Sansui SLED4280
Is there anyway to isolate which strip? There are four leads which head to the strips. If I were to take one off at a time and turn the backlight intensity back up would that work or is there a better way to isolate the bad led or leds? Would a visual check indicate the bad led if I open up the panel?
ThanksComment
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Re: Sansui SLED4280
Measure the voltages on each LED string until it fails. Unfortunately it is a bit hard to figure out what LED failed, since it is working fine until it gets warm. Then you know in what string the bad LED is. Then you'd have to test either each LED or a LED strip individually with a variable CV CC lab power supply.Comment
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Hello, this is my first post and im just a beginner, so be easy on me guy. thanks
i have a LED chandeilier that switches colors from white to cool white to warm when toggling the switch, it has 24 LED arms, each arm is 30 CM length.
i have no datasheet at all for the LED lights, all i have is its length.
long story short, testing the chandelier on the ground, and it works fine for 1 - 2 - 6 hours, no problem.
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Need Audio Driver for Thomson P14C4BK128 (Windows 10/11)
Hi everyone,
I'm looking for help finding the correct audio driver for my Thomson P14C4BK128 laptop.
The sound is not working properly, and I believe the audio driver is missing or not installed correctly.
Here are the details:- Model: Thomson P14C4BK128
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Let me start from the beginning, the motherboard suddenly stopped working one day. There are no beep signals from the speaker, and the debug LEDs are not lighting up. After inspecting it under a microscope and using thermal imaging, I didn't find anything that could be damaged.
After that, I began voltage measurements, in which I noticed the absence of VDDQ, VDDP, VTT, and VPP lines. Later, I checked if there is an EN state on these lines,... -
Problem
Fixing a dimming zone TV with LEDs not lighting up. Dimming zone circuit introduces added variable to diagnose LED and/or Dimming Zone Driver board? Some 1/2 rows of LEDs appears to be out in active dimming zone off AND some brightness flickering with active dimming zone high while playing changing video
Model & Board Pics
Conflicting Spec
Vizio indicate this TV has 10 dimming zones. However, LED strips and Zoned light driver connector suggest 12
https://www.shopjimmy.com/vizio-gj-2k1...
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