How To Repair Samsung Plasma TV Won’t Turn On

By on July 19, 2016
Samsung Plasma TV repair

 

 

 

 

 

 

 

This 51 inch Samsung plasma TV problems with the model: no PS51E450 /chassis –F5AA was won’t turn on and always in standby mode.

Samsung Plasma TV

Photo 1

I normally start troubleshooting the power supply board (BN44-00509) first for any abnormality. The connector CN802 (photo 1) was disconnected and all the output voltages on the connector pins were measured. The VS and VA voltages were found to be missing.




On visual inspection on the board, I found the high voltage capacitor CS809 has burnt mark on one of the lead as shown in photo 2. The capacitor was de-solder for confirmation. It was  found to be open circuit.

how to repair samsung plasma tv wont turn on

Photo 2

After changing the capacitor, the voltage of VS and VA rises to around 200V and 58V respectively. This confirmed that the power supply is working normal so I reconnect the connector CN802. With the power on VS and VA re-measured again, the voltage is returned to zero again. I suspect the Y-sustain was faulty, when CN5006 was disconnected the voltages of VS and VA is back to normal. The TV can be activated now and the TV sound channel can be heard.

Visual inspection of the Y-sustain board (LJ41-10181A/LJ92-01880A) , there was sign of overheating around Q5037 see photo 3.and 4

samsung plasma tv wont turn on

Photo 3- Y sustain board

how to fix samsung tv won't turn on

Photo 4-Close up view of Y-sustain board top and bottom burnt mark area location.

This burnt mark on the pcb provide a very good  indication of overheating and maybe defective components. All the power devices around the pcb burnt mark  were checked with a multi-meter and  as expected the following components were found to be shorted:

  1. Q5037-K10A500 (MOSFET)
  2. Q5030-SMK630 (MOSFET)
  3. Q5003-FGPG4536 (IGBT)
  4. D5005-SF10A400H (FAST RECOVERY RECTIFIER)

After changing all the above mentioned  defective components, the TV set come alive when power is turn  on.

my samsung tv not turning on

Although the video looks normal, it is advisable to reconfirm  and calibrate the settings if necessary  for the power and Y-sustain board to avoid overloading the panel. The test points for Vs, Va ,Vsc and Ve are clearly marked on the boards and the voltages can be calibrated with a multi-meter with reference to the manufacturer printed label on the panel (photo 5). Samsung alignment are quite straight forward and does not require an oscilloscope as compare with LG.

samsung plasma tv standby problems

Photo 5-Voltages recommended by the panel manufacturer

Another Plasma TV not turning on has been successfully repaired.

skwong

This article was prepared for you by SK Wong from Malaysia and he graduated from London with a degree in Electronics and Electrical Engineering. He has more than 40 years of experience in the consumer product manufacturing. With the passion to repair electronic products from young , he has been doing it part time until now.

Currently, he can provide turnkey solutions for consumer products including services from idea or concept to design , prototyping , finished products (including electronic,mechanical and plastic parts) and manufacturing.




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Note: You can check his previous repair articles below:

http://jestineyong.com/no-power-in-philips-lcd-tv-repaired/

http://jestineyong.com/lg-plasma-tv-unable-to-turn-on-repaired/

 

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18 Comments

  1. Parasuraman S

    July 19, 2016 at 9:17 pm

    Good job, exposing a thorough knowledge on handling plasma TVs! Many thanks for sharing!

    Likes(2)Dislikes(0)
  2. Humberto

    July 19, 2016 at 9:52 pm

    Good repair SK Wong. Thanks for sharing your knowledge.

    Likes(3)Dislikes(0)
  3. Henrique Jorge Guimarães Ulbrich

    July 19, 2016 at 10:42 pm

    Nice, Mr. SK Wong. Thanks to give some more knowledge.

    Likes(1)Dislikes(1)
  4. vikash

    July 20, 2016 at 12:42 am

    Hello i got a same Samsung plasma tv and similar problem about the y-sus and y-buffer board. But my vs and va output voltages comes out just when power on and then iit drops down to zero volt. So could you tell me how can i activate the power supply only without load.

    thanks

    Likes(1)Dislikes(0)
    • skwong

      July 21, 2016 at 5:00 pm

      You can measure the VS and VA output voltages without load or standalone i.e testing the power supply without connecting to any boards.If your power supply is normal the VS and VA voltages will stay , I suspect yr power supply is faulty on the assumption that yr standby 5V is normal. You may try trouble-shooting the ic'S ICS801S and ICP801S. One or both of them could be faulty.
      Good luck.

      Likes(3)Dislikes(0)
  5. Albert van Bemmelen

    July 20, 2016 at 1:33 am

    Thank you Mr.SK Wong for the impressive repair with so many components shorted! Followed by a terrific adjustment check after repair too!!

    Likes(0)Dislikes(0)
  6. Victor Mash

    July 20, 2016 at 3:17 am

    That's was very nice mr wong and thanks for your sharing. Cheers

    Likes(0)Dislikes(0)
  7. Arnold Que Pia

    July 20, 2016 at 8:13 am

    Wow. Have an amazing sharing Sir. Wong and it really worth to us.

    Likes(0)Dislikes(0)
  8. Tito Kanshulu

    July 21, 2016 at 3:42 am

    The article is well explained Mr. Wong. Thanks for sharing.

    Likes(0)Dislikes(0)
  9. Ross Wedding

    July 21, 2016 at 3:07 pm

    Thanks Mr Wong for sharing your repair information, they most helpful. Please keep them coming

    Likes(1)Dislikes(0)
  10. Samir Mulla

    July 23, 2016 at 4:46 pm

    It is very useful to me...great

    Likes(0)Dislikes(0)
  11. Giorgio

    July 30, 2016 at 4:43 am

    The fault came from a design problem (underrated components). I suspect that the same components will fail again from overheating.

    Likes(0)Dislikes(0)
  12. Robert Calk

    August 2, 2016 at 4:24 am

    Nice job, Mr. Wong. Thanks for sharing the repair with us.

    Likes(0)Dislikes(0)
    • Jestine Yong

      August 2, 2016 at 5:55 pm

      Thanks guys!

      Jestine

      Likes(1)Dislikes(0)
  13. Chandran

    September 13, 2016 at 10:16 pm

    Dear Mr SK Wong.Thanks for the article on troubleshoot Samsung plasma TV no power.My Samsung plasma TV blacked out after a pop sound.The led light blinks 6 times when powered with remote.Tried checking the PSU board but no damaged component found.Based on your tips,further checking found a burnt ceramic capacitor near heatsink of the Y-sustain board.I already replaced it, but feels that need checking some more. Your comment,please whether this will fix the issue or need to test further.Thank you.

    Likes(1)Dislikes(0)
  14. david

    January 7, 2017 at 1:39 am

    Hi Sk
    Thanks for sharing your tips.

    My dad's samsung 42 plasma could not be turned on and gives popping sound from speaker.
    suspect is the Y sustain board lah.

    do you know where to order a replacement board without going through the soldering?

    Likes(0)Dislikes(0)
  15. Jim Sly

    April 28, 2017 at 6:23 am

    I have a Samsung plasma that won't turn on or red light standby. Lost 3 Samsung TV's in a storm, 2 32 inch LED's and one 51 inch plasma. 2 LED's were fixed with power supply boards. Plasma PN51E450A1FXZA year Oct. 2012 VS-ADJ PC8V003132. Replaced power board version TS04 with no results. I'm not sure what's next to check/replace. Any help would be appreciated. Thank You in advance!

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  16. Tony

    July 16, 2017 at 2:53 am

    I have a 32 inch Samsung plasma that won't turn on, i guess it was due to lighting storm, I opened it up but cant find any physical damage capacitor or burnt part, Any help would be appreciated. Thank you in advance

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