How To Repair Samsung Plasma TV Won’t Turn On
This 51 inch Samsung plasma TV problems with the model: no PS51E450 /chassis –F5AA was won’t turn on and always in standby mode.
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.
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
Photo 3- Y sustain board
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:
- Q5037-K10A500 (MOSFET)
- Q5030-SMK630 (MOSFET)
- Q5003-FGPG4536 (IGBT)
- D5005-SF10A400H (FAST RECOVERY RECTIFIER)
After changing all the above mentioned defective components, the TV set come alive when power is turn 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.
Photo 5-Voltages recommended by the panel manufacturer
Another Plasma TV not turning on has been successfully repaired.
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:
https://jestineyong.com/no-power-in-philips-lcd-tv-repaired/
https://jestineyong.com/lg-plasma-tv-unable-to-turn-on-repaired/
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Leave a Reply
Parasuraman S
July 19, 2016 at 9:17 pm
Good job, exposing a thorough knowledge on handling plasma TVs! Many thanks for sharing!
Humberto
July 19, 2016 at 9:52 pm
Good repair SK Wong. Thanks for sharing your knowledge.
Henrique Jorge Guimarães Ulbrich
July 19, 2016 at 10:42 pm
Nice, Mr. SK Wong. Thanks to give some more knowledge.
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
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.
Roberto
April 6, 2019 at 11:13 pm
I have a plasma ps51e490 tv where the tensions are missing (va vs)
I replaced the failed components on the ysus module but without results. even if I disconnect the ysus connector I do not have the voltages (va vs) immediately go down to 0volt.this power supply works even without load?
affie
February 26, 2021 at 3:04 pm
mr sk.i also have ps51e470 have no vs n va output,pwr standby 5v also have...without connect any board only main board...starting sound activate...already check all component but still not gind it..any suggestion for troubleshoot it mr sk?
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!!
Victor Mash
July 20, 2016 at 3:17 am
That's was very nice mr wong and thanks for your sharing. Cheers
Arnold Que Pia
July 20, 2016 at 8:13 am
Wow. Have an amazing sharing Sir. Wong and it really worth to us.
Tito Kanshulu
July 21, 2016 at 3:42 am
The article is well explained Mr. Wong. Thanks for sharing.
Ross Wedding
July 21, 2016 at 3:07 pm
Thanks Mr Wong for sharing your repair information, they most helpful. Please keep them coming
Samir Mulla
July 23, 2016 at 4:46 pm
It is very useful to me...great
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.
Robert Calk
August 2, 2016 at 4:24 am
Nice job, Mr. Wong. Thanks for sharing the repair with us.
Jestine Yong
August 2, 2016 at 5:55 pm
Thanks guys!
Jestine
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.
david Jones
December 20, 2017 at 5:07 am
Hello Chandran if you read this - I have had exactly the same problem - C5009 on the Y sustain board was blown up. Replaced the Y board and the PSU board but still dead. Did you fix your fault and how did you do it ?
David Jones.
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?
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!
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
Johnny Philibert
August 1, 2017 at 12:58 am
Thanks a lot. You won't believe this. I have a TV just like that and the component that were burnt were the same as yours: Q5037-K10A500 (MOSFET, Q5030-SMK630 (MOSFET) and Q5003-FGPG4536 (IGBT). So your article directed me straight to the failed components. Thank you again.
david Jones
December 20, 2017 at 5:50 am
Can you offer any suggestions on the following fault ( same model as in this article ). TV went pop , picture failed but sound remained. after switching off and on sound also gone.
Found Capacitor C5009 Near top left of Y sustain board blown up. Changed board and picture briefly appeared then disappeared. Suspected PSU so changed the board, fault remained the same. 5V present but Vs and Va absent on both boards. your article seems to indicate that the PSU is always running 24 hours a day ? could it be that Vs and Va are switched on/off by the main board as needed ? I can get replacement boards (2nd hand) cheaply so board changes are not a big problem. Got any suggestions ?
Many thanks for your attention ,
David Jones. (In Wales !)
david Jones
December 20, 2017 at 6:03 am
David Jones here - I should have mentioned the flashed fault codes which are a bit odd !
dash longdash longdash longdash dash pause dash pause pair of quick dots repeated 5 times. This last bit (5 pairs of dots ) then repeats ad infinitum. please forgive the morse code analogy but how else could I describe it ! ! !
Matt
February 15, 2018 at 5:48 pm
Hello,
I recently got a Samsung Plasma TV PS-42c96HDX for free.
I fixed the smtp board which had bad capacitors at the bottom right part .
I checked voltages outputs and everything seems to be ok. when I switch on the the TV I have Vs / Va / Vamp 18v / Vg / 12v / DC 5.3V / STD 5V as expected.
The logic board led is blinking and I can see the red light from the optic source on the main board.
The main board processors are hot.
But there is no start up sound and a very fade image backlight seems to flicker a little.
At this point, I could think I got a problem with X Board or Y Board but would it prevent the tv from starting correctly ?
I followed the service manual instructions and I disconnected X board, Y board and Logic board from STPM but TV did not started.
Reconnecting each board one by one didn't make it too.
Any Idea, please ?
Thank you !
Manohar Arekar
September 27, 2019 at 4:07 pm
Hello i got a same Samsung plasma tv problen. vs and va output voltages comes out just 210 and 55 volt when power on and then fast down to zero volt.test on load and without load same condition. So could you tell me how can i activate the power supply
Plasma TV SAMSUNG model PS43F4900
Ahmed
March 19, 2020 at 6:01 pm
Mr Wong
Good in detail i appreciate yours efforts
I have checked all this components shorted but now issue i cant found these parts in local Pakistan market. some peoples have old circuit boards of faulted or dead tv and surprising thing all of boards have these shorted parts
any equivalents specially smc 630
leonard james keyaa
May 23, 2020 at 1:25 pm
I have aproblem with vs voltage.is not staying on comes then gos off.itryed to check invater its like ok,ineed your helep pls.
SOMANTAK GHOSH
August 18, 2020 at 3:11 pm
Hi, Mr. S K Wong,
I have Samsung 43" Plasma TV 43H4900 model which is 6 yrs old. Yesterday the TV just stopped working with a "kaput" noise and observed that my MCB tripped. I checked with other appliance and found that the power socket at wall is fine.
What may be the issue? Let me tell you that I have no idea about any of these electronic repairs. I just want to know what is the actual fault and also to check if the service engineer is cheating me or not.
Thanks in advance.
Regards,
Somantak Ghosh
Douglas
January 20, 2023 at 1:39 am
I have a 20-year-old PN50A400 50-inch TV with no picture, buck power is on and the screen is vaguely grey. Any suggestions?
hidroportosjalcobia@hotmail.com
May 22, 2024 at 3:28 am
A forma como as explicações foram transmitidas não como se apreender muita coisa sobre reparação de plasmas. Muito obrigado meu amigo e mestre.
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The way the explanations were conveyed didn't make it possible to learn much about plasma repair. Thank you very much my friend and master.