Re: samsung LN-S4051D diagnal lines
no continuity between bridge+ and main cap+.
no continuity between bridge+ and main cap+.
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Re: samsung LN-S4051D diagnal lines
you dont think its time now to order new glasses ..lol
each time u work on tiny things you kill tvComment
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Re: samsung LN-S4051D diagnal lines
oh I think i killed it a while ago lol, i don't know if i should be getting continuity on bridge+ and main cap+ theres a diode between them, of course i was looking at some work on a led tv, so probably different setup.Comment
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Re: samsung LN-S4051D diagnal lines
it must be the pfc ic is screwed, I lost my boosted voltage.Comment
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Re: samsung LN-S4051D diagnal lines
any way of knowing what kind of ohms i should get on the legs of the pfc ic? or how to test it?Comment
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Re: samsung LN-S4051D diagnal lines
im checking all the tiny resistors caps n diodes, they're testing ok.Comment
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Re: samsung LN-S4051D diagnal lines
you have open R now at pfc... since it was clicking after u disconect MB from PCB.. like there are load / short at LEDComment
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Re: samsung LN-S4051D diagnal lines
it only clicked with mainboard connected, but now that the boosted pfc is gone there is no clicking every 5 seconds connected or not, like i had before with the boosted pfc.Last edited by nomoresonys; 06-06-2022, 06:13 PM.Comment
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Re: samsung LN-S4051D diagnal lines
did not understand this, you mean backlight led? this one is ccfl.Originally posted by Diah View PostComment
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Re: samsung LN-S4051D diagnal lines
can anyone answer the question, why the dc voltage on the bridge rectifier, thats + and - the 2 outside legs is 106, it was 106 when the backlight was staying on for 15 minutes, the ac coming in on the bridge rec. is 120 as it should be, is this normal or does it point to a problem???Comment
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Re: samsung LN-S4051D diagnal lines
can it be just a weak faulty bridge? all the diodes check good in it.Comment
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Re: samsung LN-S4051D diagnal lines
ok, now have the clicking twice every 5 seconds back, gonna call that progress.
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Re: samsung LN-S4051D diagnal lines
Wow Nomoresonys you surely have perseverance. You started this thread in 2014 and you are still at it. I know nobody out there that would do that. Cudos to you.Comment
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Re: samsung LN-S4051D diagnal lines
Lol, that would point to insanity wouldn't it? no, I fixed it with a mainboard in early 215 then it just started acting up again lately, its old as dirt but these early samsungs have a very good picture, otherwise I wouldnt bother with it, kind of heavy and clunky compared to newer stuff. I like the puzzle aspect of it but so far its getting the better of me.
Last edited by nomoresonys; 06-09-2022, 03:58 AM.Comment
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Re: samsung LN-S4051D diagnal lines
the samsung I'm using in place of this one is a un model edge lit tv and it pales in comparison no matter how much calibration is done, much lighter and sleeker looking and no mercury BUT worse picture quality.Comment
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Re: samsung LN-S4051D diagnal lines
just been reading this thread on the shop jimmy picture top right where someone has marked those capacitors with red marker have you tested all of those caps in that area for uf and esr as these do fail maybe heating that ic is also heating these caps and lowering the esr temporyOriginally posted by nomoresonys View PostComment
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Re: samsung LN-S4051D diagnal lines
yes, I was getting the bad cap clicking syndrome, changed those 8 electros out and it worked fine for several months then the connector from powerboard to main burnt out, think it was just from old age, replaced that and touched up the joints worked fine for a few more months. Started clicking again, could get it to stop and the backlights would be on for 15 minutes or so by heating the area of ICS801, then was messing around testing the three 8 pin ics on top side of board while powered while testing one of them tv went on and off, then tested main cap and saw I lost the boosted pfc, found QI802 shorted from gate to source, switched it out with K4087 https://www.alldatasheet.com/view.js...K4087&sField=1, which I think is close but not sure. Now still have no boosted pfc and heating that area of ICS801 doesn't get the backlights to come on anymore.
Last edited by nomoresonys; 06-09-2022, 05:02 AM.Comment
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Re: samsung LN-S4051D diagnal lines
CNI804 does have 12 volts as indicated at the connector.Comment
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Re: samsung LN-S4051D diagnal lines
took out ds805, testing the thru holes I only get 59 ohms, is that too low?Comment
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Re: samsung LN-S4051D diagnal lines
will AR S1 80 diode replace 1n4005? they are same size physically, can not seem to find info on ar s1 80.Comment
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