Re: Samsung UE55MU6120K Boot loop with backlight no video
Yes, dc to dc converter, somehow I put it in wrong and came up with this, didn't think that seemed right, lol: https://www.aliexpress.com/i/3256803...apt=4itemAdapt
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Samsung UE55MU6120K Boot loop with backlight no video
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Cool, bet that was it, damn solder crack on that little bugger, didn't think it was anything major because it ran for 30 hours straight.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by lotas View PostThis is a DC / DC converter for powering the panel, there may be a problem in tying this converter with ceramic capacitors.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
This is a DC / DC converter for powering the panel, there may be a problem in tying this converter with ceramic capacitors.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
so I wonder what exactly it could be, do any of those little mlc caps test short, maybe check those resistors too, what is that chip the ethernet switch?Last edited by nomoresonys; 03-11-2023, 01:25 PM.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Actually it probably is the mainboard, well there's your proof, posted this after the above post, as in wrote this before your above post so didn't see that til after I posted.Last edited by nomoresonys; 03-11-2023, 02:02 PM.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by lotas View PostWell, now try, with each lvds cable (from the left, then from the right).
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by nomoresonys View PostWell you can replace the mainboard 47 times but it still won't fix it if the problem isn't the mainboard.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by fanaticgames View PostI'm back, I bridged the points indicated by you (without connecting the display flats) and the TV turns on and off repeatedly as always, at this point I buy a motherboard once and for all
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Well you can replace the mainboard 47 times but it still won't fix it if the problem isn't the mainboard.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by lotas View PostYou didn't seem to put a jumper there.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Evidently if you have forced TCon-Ready signal and something heated on the main board, the main goal is to locate the short circuit, actually it can also be on a small cap on mainbboard, thethermal cam helps, but also if you go to the supermarket you can ask the shop man for a piece of adhesive thermal paper for the fiscal record, if the heat comes from an inductor only on mb then better to search on the panel distribution boards
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by Davi.p View PostDon't waste time with thoughts of bad soldering joints and Macumbeiras... the problem reseats on the display and obviously without surgeries and with the eprom comparison equal you have a alternating defect maybe little heat related, maybe to gate COG , better to start the tespoint searching, clock lines, and prepare masking flats with tape..
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Re: Samsung UE55MU6120K Boot loop with backlight no video
doubt it very much, can not recall a shorted panel ever not working then working for 30 hours.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Don't waste time with thoughts of bad soldering joints and Macumbeiras... the problem reseats on the display and obviously without surgeries and with the eprom comparison equal you have a alternating defect maybe little heat related, maybe to gate COG , better to start the tespoint searching, clock lines, and prepare masking flats with tape..
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Re: Samsung UE55MU6120K Boot loop with backlight no video
lmao...hate when that happens.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by nomoresonys View Postprobably won't work but if it's still on the wall try a quick reset before you wrestle it back off the wall, unplug tv, hold power button for 30 seconds and try it, prolly no joy, then off the wall again.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
probably won't work but if it's still on the wall try a quick reset before you wrestle it back off the wall, unplug tv, hold power button for 30 seconds and try it, prolly no joy, then off the wall again.
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Re: Samsung UE55MU6120K Boot loop with backlight no video
Originally posted by nomoresonys View Postnot sure, but probably retaining a lot more heat if it's snug against the wall, well was it sitting straight when running for 30 hours as in same position as on the wall.
It just didn't turn on, plugged into the wall...turned on and baamm rebooting like always
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