Re: qn75q70rafxza suiciding samsungs
What is the general resistance between 1(3.3v) and 4(GND), is it not low?
What is the general resistance between 1(3.3v) and 4(GND), is it not low?
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Re: qn75q70rafxza suiciding samsungs
Pt9801Comment
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Re: qn75q70rafxza suiciding samsungs
or try by pass it with short circuit..Comment
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Re: qn75q70rafxza suiciding samsungs
You need to determine how and what is assembled on these three channels, what voltages they have at their terminals, and what transistors they are.Attached FilesComment
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Re: qn75q70rafxza suiciding samsungs
Will do lotas, will report back in about 4 hoursComment
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Re: qn75q70rafxza suiciding samsungs
one things more.. if PT9801 (a PTC Thermistor as we thought ) and there swollen at the middle of the surface it will be in cutoff always.Comment
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Re: qn75q70rafxza suiciding samsungs
1.408v you have also on pin 1 9802 ?Comment
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Re: qn75q70rafxza suiciding samsungs
did you read my post #56 ??
you need to free one leg of PT9801... to let Pin 1 zero V. and then we feed Pin 1 with 3.3V... i wrote an example... but you can use any source on TV like power on.... but in this case need to connect it via R 1KComment
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Re: qn75q70rafxza suiciding samsungs
So can I just pull pt9801 off the board then feed pin 1 the 3.3v? I don't know how to free it otherwise. And I will need to buy some resistors I see you say jump 3.3v with 1k all the time but I don't have one. Maybe scrap board. Okay will try tonightComment
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Re: qn75q70rafxza suiciding samsungs
Okay I didn't get into all the exactness of it but installed new led driver board and it's working fine. Points 1 and 2 as established run at 3.1v as picture shows.
Thx story, lotas and diah and anyone I may of missed.Attached FilesLast edited by EazyBone; 10-19-2023, 01:01 PM.Comment
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Re: qn75q70rafxza suiciding samsungs
lol.... wrongLast edited by Diah; 10-19-2023, 01:44 PM.Comment
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Re: qn75q70rafxza suiciding samsungs
I would love to know what was wrong on the old board.
Not sure if you buttoned up this TV yet but if not (and it were me) I would be probing and comparing to see where the fault was. An SMD or an IC.Comment
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Hi and thanks in advance for any input you might provide!
I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO
Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this... -
Hi everyone,
Iām looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).
š§© Problem Summary:- The TV keeps scrolling through the menu or selecting items by itself.
- I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
- The remote control is not in use (batteries removed), and the TV still shows the same behavior.
- I
07-28-2025, 08:34 AM -
Hi everyone,
Im looking for some advice regarding my Samsung UE55MU8000 TV with main board model BN94-11606C. The TV suddenly stopped turning on and now shows no signs of life at all not even the standby light at the bottom.
Initially, I suspected an issue with the PSU, so I took it to a repair center. They tested it and confirmed that the PSU works perfectly, even on other TVs. Based on that, I started investigating the main board.
I disconnected the main board from the PSU, and the backlight turned on, which seems to confirm the main board is the issue.... -
The set is not turning on, when buttons on the front are pressed the button press sound is coming from the speakers, but the set is not trying to turn on, consuming only couple of watts.
I am troubleshooting a Vestel 17PW26-5 from the set. Not sure how it is supposed to turn on main supply, but with the main board disconnected not getting the main supply to turn on either.
Standby supply is working, PFC is working (390V), but the main supply is dead. Checked the mosfets and driving transistors and found they are not shorted and showing a diode junction. The suspicious...Yesterday, 01:55 AM -
Hoping someone here could possibly help. I have a few questions in regards to compatibility with main boards. But I'll give a quick short run down on what's going on first;
I have Samsung Smart TV UA65MU6100WXXY version DA01
Now years ago it started intermittently playing up after a lighting strike. Lighting hit the block of units i was living in at the time. Ever since that night the TV started having a mind of its own, It would randomly turn itself off or on, and all inputs stopped responding like HDMI, aerial, but USB still worked. Anyway, over the next few months...
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