Re: Samsung UN58H5202AF - killing mosfet.. no power

Are you saying that bad led strips are causing q9101 to fail?

I've replaced the one I am working on twice now.... first time lasted a few hours. 2nd time I dimmed the leds to 50% and it has been on for 24hrs so far (thanks budm). My board is burnt in the same sport just like the original posters. Wish I had the testing voltages for the PSU board.



Used:
[url]https://www.digikey.ca/products/en?keywords=IPD50R380CEAUMA1CT-ND%20[/url]Re: Samsung UN58H5202AF - killing mosfet.. no

Re: Lc-60le810un 1-1

have you got the K to come up by holding vol - input and pressing power ? this tv you dont do it with plugging in but by pressing power button


Once you have K hit vol - and ch up I believe to get the menu.

Re: Lc-60le810un 1-1

I don't know why people actually lift the screen out of its case.... I could access everything with out removing the lcd from the back light assembly.

Yes, I will test for sure this time. :P. Change in symptoms now. in bypass mode before it would operate normally with remote just no back lights. Now it shuts down after about 15 seconds back into 1-1. Maybe a short?

Re: Lc-60le810un 1-1

replacement led works well... colour is a bit off but cant really tell.


on a side note after reassembly the leds still do not light I guess I will take her apart again.

Re: Lc-60le810un 1-1

yeah it looks very similar.


I think the colour and current should be right, we'll see tomorrow when I get them.



...

Re: Lc-60le810un 1-1

Found an open LED, first one in the side strip bottom left. Must had been iffy which allowed the back lights to fire briefly before it went completely open.

Ordered a few from [url]https://www.digikey.ca/product-search/en?keywords=1516-1038-1-ND[/url] and will report back on how it works out so others know.Re: Lc-60le810un 1-1<br /> <br /> ...038-1-ND[/url]

Re: Lc-60le810un 1-1

voltage output for the LEDS seems wonkey on 1,2 and 3 when I power up in error override mode..... sometimes nothing.

4 was consistent 120+ (my meter was probably not fast enough for the 1 second led blink)


I guess I will wait for the board on Monday and if that doesn't solve it I will pull the panel.

I have read many topics on this forum and it seems this can be caused by different issues. I get the one slow one fast error (lamp\psu). If I by pass the error with the terrible touch sensor buttons I can get the back lights to flash on for a second then turn off, the panel displays the input w\o backlights.

Thoughts on how to confirm what is really the cause ?

I ordered a new psu\driver board from sharp and thought id play it safe and replace that first, but I have my tv sitting on my bench with the back cover off and I am excited to troubleshoot it further while I wait...

Re: New Members - please post your introductions here

hi