Need some advice here. So I picked up this 55" off the curb and diagnosed it with bad leds. I opened it up, tested the 4 strips with the tester and yes, 2 strips had burnt leds. I ordered a new set and installed them. But before putting tv back together, I always test tv to make sure I did it correctly. Tv lights up and works, however when turning tv off, the top set of leds remain on. Swapped power supply with identical one and same results. Swapped MB with identical one, same results. So I put the tv back together and reset MB. Tv works fine like new, but leds remain on when powering off. They go off only when unplugging tv.. Im ready to tear it apart again and inspect the led wiring, but any ideas what causes this before I do?
-
-
i think the top LED set which remain on was the one defect at the original one.
Roku TV, android TV, Google TV, they have active circuit at PSU, so when you put the set at STBY , and when you turn it on again you will have direct Home Picture Displaying , this called ( Hot Start )
check at setting or at service menu this point and let it be ( Cold Start ) , if there are no option about this to switch it off, then you have only to DIY the BL circuit at PSU via the Optocoupler to let it BL_ON signal control whole LED BL. -
Or you may have short contact of the top strips set LED - with chassisComment
-
Hi I am having an issue with the LED backlight of this TV. I can see the picture with a flash light, so I determined it was a backlight issue.
Initially, after opening it I found 2 shorted and 1 open LED on 2 strips (total of 4). I removed the LEDs and shorted the pads together to verify if the backlight would work.
Testing it, I found the backlight turned on and I measured 54V when TV was in standby (off), and 100v when TV was turned on. The 4 strips each contain 9 LEDs, so 36 in all minus 3.
Instead of putting it back together I decided to replace... -
Hi There!
Having fixed 5-6 TV sets by replacing full LED strips, and having watched other people fix that by replacing just one LED in the strip, my question now is what should I consider before doing so.
At this time I have some old strips removed from TV's with all but one LED working. Are there different voltage/current LED on different strips? Are 99% of them just the same and interchangeable?
How do you find which specific model is needed for each strip? When I check if a LED is OK by attaching the multimeter leads to the individual led pads on the strips I... -
Does not turn on, lights 3 of the 4 LEDs and turns off and stays like this, presses the power and repeats.
I saw that the room LED lights up only when the screen is connected, so quiet.
We have all the power supplies, even processor, 1.8V
One thing I found strange, it has a very low resistance in the Vcore is giving 1 Ohm , work with notes and such, I know that this is normal in some processors but with this resistance only take video card so found it strange.
I suspect that there may be some leak in the processor.
Anyway, when I press the power, it... -
Hello, i have some issues with my laptop Lenovo Y700-17ISK (motherboard BY511 NM-A541), it started when i turn on the laptop, but the lcd wont turn on, i then connected it via hdmi to tv and screen was ok. So i thought maybe lcd stripe is faulty, i removed the bottom cover, disconnected main battery, reset the cmos by disconnecting battery for 1 min, then slighty move the lcd stripe. Conncted power supply and tuned on my laptop, the lcd turn on, it started to load os, then it turn off, after a second it turn on, then after like 3 seconds turn off again, and so on. Removed power supply, waited... -
Ok.. this is the story:
Have an old Samsung LED 3D TV (UE55F6475). First it started to lose light on the lower 40% of the screen now and then. Like for 10-60 mins and then it would work again. Then a bit later it just got stuck in that position. The lower 40% of the screen is dark, and it gets progressively darker the lower u go so it's obviously that LED strips where not working. I also looked for similar errors online and saw an exact copy and on that one it was faulty LED strips.
This is kinda how it looked, just that mine were at the bottom of the screen:
...
Comment