Samsung PN50B450 50 in. Plasma TV Logo
dan mowers
dan mowers Posted on Mar 20, 2017
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Not the capacitors

TV will not turn on and I think there is a short somewhere. I'm aware of the capacitor problems and positive its not that. I also replaced the power source from shop jimmy.com and have the same problem as before. The red light on the front is constant and when the power button is pressed the green light on the inner back flashes a couple times and then a few clicks and then everything turns off. I then disconnected the connection from the y/x buffer board that runs to the power board and then powered up the TV. The power board didn't short out and weirdly the start-up sound came on with no picture. I'm thinking that I maybe have bad X/Y buffer board because when this board is connected to the power source the TV seems to short out. Thoughts?

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5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Nov 16, 2008

SOURCE: Samsung TV won't turn on- trying to fix it. A challenging problem

I had the same problem. I live in NJ and called the local authorized "service provide" listed on the Samsung website. What a joke. Quoted $350 just to show up, never showed up. So I opened my own TV. Took off the plastic back (10 screws) took off the large metal RF shield (12-14 screws) and noticed a blown component. The markings on the component were KL15L and it is apparently an NTC Thermistor. Obviously it got fried and not knowing if there was other damage I decided to set out to replace the entire Power PCB Board Assembly and not the component. There were two part numbers on the assembled board (BN97-00457E & BN94-00622E). After searching online I also found a suitable replacement number for these (BN96-04896A). I found two places who claimed to have the part or have it on order (shopjimmy.com and vancebaldwin.com). After placing orders with both and having neither come through, I broadened my search and found out that the LNR409D was basically the same model as my LNR408D so I looked for its Power PCB Board Assembly part number which turned out to be BN41-00521B. Google search for that part number showed the item available on ebay. I bought it a week ago (ebay 260311519904) for $144 plus $12 shipping. I removed the bad board an hour ago (6 screws about 7 connectors) installed the new one, plugged in the connectors, replaced the covers, plugged in the TV... AND IT WORKS!
Suggestion: If your TV is out of warranty then open it up (what have you got to lose) and see if the problem is obvious and maybe something you can fix (replace) yourself. The parts, spare boards, etc. are out there if you look.

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Anonymous

  • 110 Answers
  • Posted on Jun 22, 2009

SOURCE: Samsung LN-T4042H 40 inch LCD TV with cracked panel

Email a request for your part here they will give you a price and part number to order. Good luck.

[email protected]

# NOTE - If this info was helpful to anyone please click on yes!

vinhson65

  • 257 Answers
  • Posted on Aug 13, 2009

SOURCE: Samsung LN-T2632H won't turn on.

Follow these steps to figure out what problem is.
When you turn on TV, look at the back and see if the back light on. If it is on, the power supply and inverter work fine. The suspection now is main board and T-con board (the small board on the middle-top of the panel)
To find the problem from the main board or not. Look at the power supply and measure Vs on - turn on the TV, this approx 5 vlt DC needs constant once you turn on the TV. If it is drop or unstable - main board problem - replace it.
If Vs on is good - disconnect the T-con cable from the power sup. If power sup stop clicking - T-con need replacing. Hope it help.

dick davis

  • 610 Answers
  • Posted on May 21, 2010

SOURCE: One day I turned my tv off and it wouldn't turn

The power board is the usual culprit but I have also seen the main board, T/Con board or the panel itself cause this problem. I would recomend calling a trained tech to figure out the problem. You could spend hundreds of dollars on parts and still not fix it. You can call 1-800-samsung to find nearest service center.

Chi Chu

  • 8457 Answers
  • Posted on Jul 14, 2010

SOURCE: blue light flashes 4 times but no power

U know basic electronics,have tools and know basic soldering?Take the tv aparts,the power supply,that board where the a/c power cord plug into it.That the power supply board,searches the power supply board, for those dying about to be dead,capacitors alway bulges up on it tops or puff up on it tops.Replaced these dying and about to be dead capacitors,the tv power will up again and work.Or tries websites like Shopjimmy.com,Ebay,com to buy a refurbish power supply board for the replacement.

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Hello,
The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.
The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.
All these can be checked on the power supply board.
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The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)
You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.
What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.
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You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

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You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.......

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If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

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please do use the thumbs to rate this solution but please leave a positive rating for your free answer today.

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