Hi everyone i have a samsung tv here and the red power light just continuously turns on and on trying to turn the tv on and the screen remains black but after awhile the backlight will turn on and the tv makes a effort to turn on but there is no samsung logo and the backlight is just on with no boot up logo and no picture, cant access menu, switch sources etc. I took the tv apart to inspect the boards to see no bulging at all not even slightly even checked the backlight inverter no obvious damage anywhere. I heated up the power board very carefully with a heatgun and when i heat the power caps on the power supply board that makes the backlight turn on with no picture and no bootup logo instantly instead of it taking 15 mins to finally turn on the backlight and eventually keep power cycling, so my question to everyone is this a power supply cap issuehttps://www.ebay.com/itm/Repair-Kit-...item4cf49aa524or is this a backlight inverter issue. Thanks for taking the time to read my thread any help would be greatly appreciated i will post pics of anything that people request. -thanks
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Last edited by Super360; 05-05-2018, 09:06 PM. -
Re: Samsung LN37A550P3F
Do you have a multimeter for testing the powersupply?Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS. -
Re: Samsung LN37A550P3F
Yes I doComment
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Re: Samsung LN37A550P3F
Test voltages at connector CNM802, see the legend/map right to the left of it, test with negative lead to ground back of tv chassis is ok, probe top of connector, theres a 1 where number 1 pin is right there, test with tv plugged in then hit tv on, report back with both conditions, second video shows powersupply testing.Last edited by nomoresonys; 05-06-2018, 02:17 AM.Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.Comment
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Re: Samsung LN37A550P3F
example, pin 1 xxx then pin 1 with tv power button pressed xxx.Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.Comment
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Re: Samsung LN37A550P3F
https://imgur.com/a/uMJQKjAplease check imgur for pics of motherboard
also updated on/off voltage and i checked the t-con board no apparent damage and fuse was perfectly fine.Attached FilesLast edited by Super360; 05-06-2018, 02:58 AM.Comment
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Re: Samsung LN37A550P3F
.Last edited by nomoresonys; 05-06-2018, 03:20 AM.Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.Comment
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Re: Samsung LN37A550P3F
.Last edited by nomoresonys; 05-06-2018, 03:21 AM.Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.Comment
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Re: Samsung LN37A550P3F
that is cmn802 that is just the legend for it and also i should let ya know i bought a cap kit https://www.ebay.com/itm/5x-Panasoni...72.m2749.l2649 for the main psu caps also it amazing turned on and it worked till i unplugged it so i suspect its just some bad caps you can continue to ask question and i will still reply and keep you guys updated on what happens.Last edited by Super360; 05-06-2018, 03:17 AM.Comment
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Re: Samsung LN37A550P3F
Yes, didn't see your results in the red boxes at first.Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.Comment
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Re: Samsung LN37A550P3F
Sounds like a solid plan, without a meter that does esr readings, a recap will fix it or at least eliminate the caps as a fault, let us know how it goes.Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.Comment
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Re: Samsung LN37A550P3F
I sure will update you guys with how it goes thanksComment
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Re: Samsung LN37A550P3F
LNS LNT LNxxA and LNxxB model years are known for bad caps. I would replace them all even if not bulged, ezpecially Samwa and Capxon brands. Though not common, caps can fail and look fine. I have come across replaced caps that are the wrong value or non low esr.Comment
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Re: Samsung LN37A550P3F
here is the model/serial for anyone interested.Attached FilesComment
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Re: Samsung LN37A550P3F
This model is know for having bad C102 that causes boot loop problem.
http://www.shopjimmy.com/samsung-bn9...550p3fxza.htm#Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Samsung LN37A550P3F
you know what now im thinking thats whats wrong with it hmm so im thinking i will still replace all the caps and buy that as well. Honestly i think that repair kit is all thats really wrong but it wont hurt to replace all the caps from a tv from 2008. thanks by the way man.Comment
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Re: Samsung LN37A550P3F
I would replace C102, then try it, see if that was the problem, just for curiosity, before you replace the caps.Quit because THIS SITE LETS A ROGUE MEMBER TYPE ANY GARBAGE HE PLEASES AND THE POWERS THAT BE NEVER DO ANYTHING ABOUT IT SO HE NEVER QUITS. THEN YOU GET A PENALTY FOR RESPONDING TO HIS ATTACKS. BEEN GOING ON FOR WAY TOO LONG. DONE SUPPORTING A SITE THAT ALLOWS THIS BS.Comment
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Re: Samsung LN37A550P3F
ok well thanks for all the help guys i will report back in about a week when all these parts come in.Comment
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Re: Samsung LN37A550P3F
C102: Notes, white bar on the cap is POSITIVE!
https://www.badcaps.net/forum/showth...highlight=c102Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Samsung LN37A550P3F
Thanks for that bro im just going to order the repair kit and replace that cap with the one included, the kit also comes with a 2 new ic's. So just in case the ics are blown as well. btw really appreciate the help everyone especially budm he helped me with a stubborn vizio and helped me fix it almost 2 years ago, so shouthout to budm thanks buddy.Comment
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This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...09-07-2024, 05:50 AM
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Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
Summary for TL-DR readers:
• Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
• Have obtained Samsung schematic & service documents - Can upload if helpful.
• Have read ALL applicable threads
• C1818 and CP820 replaced as low hanging fruit
• CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
• VCC pin (18) of PFC... -
Hi everyone!
Hope you're all having a great day, and thank you very much for stopping by and taking the time to read this post to help me with my parents' Samsung TV.
My issue: No backlight.
Model: QE82Q70RAT
Type No: QE82Q70RAT
The TV was already serviced by Samsung once under warranty for the exact same issue, but six months after the fix, the backlight went out again. Now, Samsung is asking for nearly the same price as a brand new TV to fix this with the same 6-month guarantee.
So hopefully, I can fix this cheaper.
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TV was fixed just after removing Samsung's rear snap cover.
This curved TV's construction is rather interesting. When the snapped on back is removed, rest of the TV will relax the curvature. Top of LCD panel is loose as it wants to straighten out against the slightly curved bezel. Snapped back provide most of the curvature shape. So just simple disassembly of rear cover will allow the rest of the TV frame to relax its curvature. Thats probably what fixed it but no idea which connection. 4x LEDs are edge lit.
Maybe PSU->backlight connector didn't have a good contact?...07-23-2025, 12:34 AM -
- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
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