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The board can have bga soldering issue or both data fail and bga issue for me, so for the common humans a replacement board is the only way to run, the best way is reballing+kindly rom writing, when the first is the less problematic, the second needs a good donor board or friend tech.. which way do you prefer?
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Sounds to me no sense, why jumpering the vgh might have a change on screen? it's about unlikely that an interruption can happen from tcon to panel strip board, unless someone other put hands before you.. remove the jumper and check continuity in the vgh path, where it stops, to be true i saw a video from "vcore llc" or similar.. where this happened but tcon was not separated, anyway if you find interruption it is likely dirt that is also in others traces/pins..
check all others signals.
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My suggestion is that the best thing to do is to bring the board to a profess. lab. for reballing each one bga, costs permitting, receive it, test it for at least 3 days, then seal around each bga on board with hot glue and close the tv, the replacement board will have same problems past a certain time..Last edited by Davi.p; 04-22-2024, 04:56 AM.
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A question to the professional tinkerers that usually repair bad emmc software with the in line / icsp programming, does this job lasts many months / years usually ?Last edited by Davi.p; 04-18-2024, 12:45 AM.
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Are you able to do reballing? A first step could be a slight heating of all bga, this can in a lucky sit. activate a bit the bad balls, just to diagnose it well, then the second step if no go is a full reflow with a lot of flux, when confirmed bad balls do a reballing, anyway reballing of all the set of bga is the best, if a light reflow or complete freezing in a fridge gives no complete boot then the emmc partitions has some flaws, you can diagnose it by uart pc connection, when you see error in file reading + unable to mount partition (users partition usually) then file structure is gone and...Last edited by Davi.p; 04-17-2024, 06:49 PM.
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How many blinks? To start, replace all elec. caps except big blue and the 2 Rubycon (them are already replaced and good brand), but the big blue it's better to test it..
bulged cap is on the MB supply section, so BEST to grab an AT / ATX PSU and feed the MB with the couple 12v/5v, you can test the MB using sound and dark picture..Last edited by Davi.p; 04-17-2024, 05:34 AM.
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Does the spy led make a blinking code? Most suspected are all BGA solder on the MB. If it blinks 2 then it is screen.. wait also 2 minutes to get blinking code..
if tcon is separated yo can make screen self test..Last edited by Davi.p; 04-17-2024, 01:50 AM.
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Post the BN44- code of PS board, so i can search good pictures, or report the list of the PSB->MB connector signals..
My 2 bets are for Bad leds or bad BGA solder on MB..Last edited by Davi.p; 04-15-2024, 05:29 AM.
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i don't follow you, and i don't know if you are following me..
i correct myself "the mosfet might be jumpered D-S..." must be: " the mosfet might have to be jumpered D-S... i hope is more comprehensible..Last edited by Davi.p; 04-09-2024, 02:53 PM.
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Ok, this is probably the end, but i want to repeat the move to dismantling the screen without checking well the led control board is definitely a rookie move.. as you can see led strips are not normal led strips (in series), leds are driven individually, so some leds not lit could be because of bad driver board.. this is not a professional way, this is a very well build tv set, sad seeing it go to landfill...
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