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What is causing a humming noise on the power supply circuit board on my Samsung TV and how can I determine which components need replacing?

Recently a lightning strike hit my apartment building and caused a power surge that damaged several people's electronics. I have checked capacitors, resistors, diodes and the ceramic fuse, and none of them appear to have a short. It seems like it could possibly be a transformer issue, since one of them seems to be close to where the humming sound is located. Could replacing the transformer let my TV power on and actually work? (apologies for the short details, I originally wrote a few paragraphs with ~200 words, but somehow it did not save and I didn't feel like rewriting it.)

Posted by Taylor H. on

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5 Related Answers

Anonymous

  • 579 Answers

SOURCE: Fuses blow afer power surge

These are switch mode power supplies and very difficult to repair. If you don't find all the blown components, they just blow up again when you try it. If that model has a separate module for the supply, you can try and order a replacement, but they usually are too expensive.
What model is it? Maybe I have a junker I can take the supply from for you?

Posted on Jan 02, 2008

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Anonymous

  • 1 Answer

SOURCE: Sceptre power supply short circuit

I have the same problem. TV was JUST out of warranty. Sceptre part number is X37SV-Naga and the cost - $285.00 plus $20 shipping. Non-refundable, no returnable.

The TV is of course going to de-solder the board within a year again, so either a good heat sing on both thermistors is in order OR a law suit against Sceptre is in order for putting us a risk of fire.

Posted on Jul 09, 2008

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Jaime Hernandez

  • 2337 Answers

SOURCE: Samsung LN-S4051d power supply board

The replacement of the power supply is quite easy. You will have to remove the base if applicable and the back cover, once you remove it; you should see the power supply.
Click here to see how the power supply looks like and availability or Click here to find a cheaper one.

I can also repair your power supply. If you need further assistance you can write to [email protected]

Posted on Jan 05, 2009

Anonymous

  • 1 Answer

SOURCE: HUMMING/CHATTERING NOISE ON SANYO TV

Confirmation: Lee2fixit's solution also worked on a Sanyo 19" TV Model DS19580with 'buzzing relay'. Chassis carriessimilar relay (Type DG1U 12VDC II TV-5 8A 250V~ also by DEC) at location RL601and a 25VDC 470uF electrolytic cap at C622. After confirming the relay was sound and finding no obviously faultedcomponents tied to it, replaced the cap. Bingo, normal operation and a quiet relay. Will post a follow-up ONLY if the fix failsbefore the rest of the TV .. it's almost10 years old after all. Thank youLee2fixit and FixIt.com.

Posted on Mar 05, 2009

Anonymous

  • 1066 Answers

SOURCE: possible burnt out power supply on Yamaha RX-V557

Can you check the power transformer, voltage & resistance.
You may have to unsolder some components to test them...such as the rectifying diodes and the transformer.  I believe that the outputs from the power supply board are all DC voltages.  Is there all so a IC chip on the power supply board?  Does your insurance cover lightening damage?   

Posted on Mar 25, 2009

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if the sounds a high pitch squeal !! I had an ole tv that did that when u watched it , finally one day the dang power supply up and gave out !! so that must be what the noise was coming from all that time !!!

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What is causing my LCD tv to turn off on my Toshiba 52hl167 tv.


. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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Have a Samsung LN40D550K1FXZA 40" TV that turned on,was making a buzzing noise.I turned it off & now it won't turn on. Power cord,fuses, capacitors - ok. I plug it in I hear humming but no sound/pic


Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
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Vizio model vx322 hdtv10a is losing sound and makes a loud humming noise and a poping sound every few minutes


Good day!!!!


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Just follow this instruction to fix your TV..

1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

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its possibly dry joints on the power supply-the heat generated causes the solder to crack,and when warm creates a "crater" on the affected joint and expands with heat,and loses contact until cool.(retraction).should be easy if you are handy with a soldering iron!.failing that,take it to a repair shop as its out of warranty,and samsung will not want to know! (unless you got extended warranty,of course!)
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I have a Samsung LN40A450 LCD TV that is only a year and a half old. I am getting no power to the tv only a consistent blinking red light and a audible clicking/beeping noise. What needs to be replaced?




I will explain how to:


  • Open the case of the LCD
basically in all LCD monitors have two circuit boards (power supply board and system board)
  • After you open you will see the two boards are

  • You see a board that has a socket for the power source. wrote that the board we're looking for (power supply board)
  • Remove all cables connected to the board and take out the board. (get noted before you unplug it)
  • Now you see it components on board, we looking for capacitor.(see picture below)
46ddc22.jpg

  • Looking for damaged capacitors, physically you will see a capacitor on the top like a bloated (see picture below)
7a91ba9.jpg
  • Replace the damaged capacitor with the same value that you can see on the surface of the capacitor. (In this step you need any soldering tool)
My advice: replace capacitors with higher voltage, like 10V replace with 16V or 25V will be fine.

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Best regards
CircuitCity

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