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Old 11-11-2018, 02:13 AM   #1
cspiddler
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Default Samsung un58j5190 power supply failed

I need a component # on my power supply board. Backlights failed and shorted the transistor that regulated the power to them. Model number is: UN58J5190AFXZA. Board number is: BN44-00787A. Part is located on back side near the backlights power plug. Location ic Q9102C. Transistor is heat damaged and I can’t read the number. Can anyone help?
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Old 11-11-2018, 11:03 AM   #2
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Default Re: Samsung un58j5190 power supply failed

Quote:
Originally Posted by cspiddler View Post
I need a component # on my power supply board. Backlights failed and shorted the transistor that regulated the power to them. Model number is: UN58J5190AFXZA. Board number is: BN44-00787A. Part is located on back side near the backlights power plug. Location ic Q9102C. Transistor is heat damaged and I can’t read the number. Can anyone help?
I’ve had trouble posting my pics let me see if 3rd try is a charm.
Attached Images
File Type: jpg 5C2E7FC3-FF65-42B3-912C-25D01B4DF6FA.jpg (343.4 KB, 44 views)
File Type: jpg 35824634-DAB1-4252-A6A5-BC5BBCA98C56.jpg (395.1 KB, 34 views)
File Type: jpg 7F7F172A-070F-496D-ACAE-6C9E44CE6392.jpg (449.3 KB, 51 views)
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Old 11-11-2018, 12:09 PM   #3
yohnsee
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Default Re: Samsung un58j5190 power supply failed

Quote:
Originally Posted by cspiddler View Post
I’ve had trouble posting my pics let me see if 3rd try is a charm.
Hello,
it will be a FET. Can you read the part number on the driver IC, located beneath the burned component?
Searching its datasheet would give an idea, because manufacturers often use the recommended solution from the datasheet. But there are a few other things to take into consideration: why has it failed so badly? You have to find it out, maybe the backlight LEDs have made contact with the metal chassis? Also, when this FET goes bad, the driver IC and a few other surrounding components also go bad.

Edit: Found it. AOD3N40. But you still need to find the reason it has failed so badly.
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Last edited by yohnsee; 11-11-2018 at 12:41 PM..
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Old 11-11-2018, 01:55 PM   #4
R_J
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Default Re: Samsung un58j5190 power supply failed

Check Shopjimmy and see their note: https://www.shopjimmy.com/samsung-un...repair-kit.htm
"This model has an above-average rate of LED strip failure"
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Old 11-11-2018, 11:23 PM   #5
cspiddler
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Default Re: Samsung un58j5190 power supply failed

Thank you very much. I think I have some 3N40s on some other junk boards I’ve collected. The IC looks like an SEM 5027A. Don’t know if I have one of those but $3 maybe. Tkhe nearby resistor and diode on the top side of the board seem ok. Looking at the board I thought it would be junk but I checked the traces from the FET and all had “0” ohm continuity and none were shorted to other traces so I thought I might replace a few components and see if the board will fire back up. I’ve been to ShopJimmy and they say if the backlights fail likely it will crash the board, so backlights are next. Just a hobby to keep my old retired brain going. So if I can fix for little or nothing I can find someone that needs. Thanks again.
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Old 11-16-2019, 09:39 AM   #6
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Default Re: Samsung un58j5190 power supply failed

Just an add-on if someone reads this post. Got a backlight taster and the backlights were bad which is what burned out the power board. May help you diagnose if you see this damage. Hard to make a case for repair when I have no use for it and the value is close to the repair cost. I mostly donate them anyway and like donations that bring several times the investment. Anyway this forum is a great resource and I appreciate the help. Thanks again.
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Old 11-17-2019, 02:48 PM   #7
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Default Re: Samsung un58j5190 power supply failed

Here's a close up shot, had a power supply in stock. Hope it help. Looks like its made by Alpha & Omega

Da Bears!
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Old 01-10-2020, 12:57 PM   #8
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Default Re: Samsung un58j5190 power supply failed

Hey "cspiddler", I just wanted to thank you for this post! A buddy of mine gave me this TV and when I opened it up the exact same problem was very evident on the power board. This post saved me a lot of time, thank you.
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Old 03-30-2020, 09:57 PM   #9
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Default Re: Samsung un58j5190 power supply failed

Quote:
Originally Posted by jeffreyulrich View Post
Wouldn't it be better for you to change a bn44-00787a? It's cheap. It's only 26 dollars

https://w***************************...***********tml
Are you only here to sell your parts?

Last edited by SMDFlea; 03-31-2020 at 08:27 AM.. Reason: Spam link removed from reply to a spammer
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Old 03-30-2020, 10:05 PM   #10
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Default Re: Samsung un58j5190 power supply failed

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Originally Posted by r_j View Post
are you only here to sell your parts?
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Basic LCD TV and Monitor troubleshooting guides.
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Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

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Old 03-31-2020, 10:49 AM   #11
cmg3631
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Default Re: Samsung un58j5190 power supply failed

Well! It's a moot point now. I cracked the screen while relocating it. I need to get me a pair of those suction cup screen holders.
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Old 03-31-2020, 11:13 AM   #12
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Default Re: Samsung un58j5190 power supply failed

https://www.harborfreight.com/search?q=suction%20cup
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