I have a UE40D5520 with the common fault of stuck in boot logo on and off and repeating. No mainboard for 40 inch model currently available but I do have a board from a 32 inch model which suffered screen damage available. The BN94 numbers are almost identical the 40" being BN9405069D the 32" BN9405069AD. Havnt got the 40" TV yet just a customer repair enquiry so cant try it and see. In the past on the older Samsung LCD TVs it used to be possible to change the screen size in service menu. Anybody able to advise whether this might be possible in this case??
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Re: Samsung UE40D5520 main board compatability
Im pretty sure the 32inch board will work in the 40inch screen. Only difference might be a usb connector for example.I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!
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Re: Samsung UE40D5520 main board compatability
Thanks for your reply. An in house repair to customers TV could be worth a try?
All usb sockets are identically placed. Appreciate your input.Comment
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Re: Samsung UE40D5520 main board compatability
You could call the customer saying you might have a solution but your not 100% sure. I think the board will work , maybe a service menu option that needs to be changed.......
We will only find out if you try it but you cant really damage anything. It will turn on or not.
Problem is probably the cpu chip , bad bga solder. Reflowing the board might work for while...I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!Comment
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Re: Samsung UE40D5520 main board compatability
Just thought I would close this thread with a report that fitted 32" inch board today in 40" Model today without any problems. No adjustments needed in service Menu just a straight transition. hope this might help in the future with similar non availability of 40" board for this model problems.Comment
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Re: Samsung UE40D5520 main board compatability
Why not just replace the nand and fix it yourself.Comment
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Re: Samsung UE40D5520 main board compatability
I will vouch for this seller.
I've bought one from him and it works perfectly.Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Samsung UE40D5520 main board compatability
I know you've fixed the tv but try to keep the board in circulation.Comment
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Re: Samsung UE40D5520 main board compatability
Thanks for the information. So youve had similar issues and this is the micro to change. Will keep that in mind for the future.Comment
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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.... -
Schematics for the main board needed please. Sticker on board states BN94-07517A but the silkscreen says BN41-02157B. Cant find here or anywhere on the web.
Backlights work when main boards disconnected. When connected and power button switched, the relay on the PSU board turns on for one second then back off.
While relay is on, all voltage rails are present and steady (scoped) on main board.
I love a good logic puzzle but getting lost without any schematics.
No shorts on ANY capacitor main board.
Thermal camera shows 3.3V inductor getting warm instantly but...10-19-2025, 06:32 PM -
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 -
When plugged in it will click and cycle the BL on and off, no pic and does not respond to remote. When I disconnect the cable from the PS board to the main board and then plug it in the BL will come on and stay on. There are only two boards in this set, the LVDS cables from the panel driver boards connect directly to the main board. Since the BL comes on and stays on I'm thinking the PS board is ok and the problem is on the main board. Should I order another main board or do I need to do more testing? thanks, Lee
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