Question about Samsung LN46A750 45.9 in. HD-Ready LCD TV

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Replaced the 4 power capacitors now tv runs for 15min. then picture turns black and volume stays on

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When the picture goes black, dim the light in the room and shine a bright flashlight on the screen. If you see a faint picture, you have a backlight problem. If this issue came about after you installed the capacitors, double check the installation of your caps. Ensure that you don't have cold solder joints or broken joints!

Posted on Oct 30, 2013

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Posted on Jan 02, 2017

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SOURCE: Samsunb 4051: TV screen turns off sound stays on.

Most likely this set has an "integrated" inverter, as most samsungs do--and this DOES sound like an inverter problem. Make SURE thought, there are no more bad "10 volt" caps on the power supply...ALL of them need to be replaced no matter HOW they look.

Posted on Oct 15, 2009

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Comes on fine, good picture and sound. After about 15min. sound stays on but picture goes black


Fault to the main power supply regulator section. Either it will be a separate board, or the part of 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.
http://electronicshelponline.blogspot.com/
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STAYING ON STAND BY NO PICTURE OR SOUND


Good day!!!


That problem is usually cause of faulty capacitors on the power supply board..

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

Jun 20, 2012 | Televison & Video

1 Answer

Samsung Model 860 LCD TV. Just 2 years old. Screen went black but sound still works. Seems like others are having the same problem.


If the screen is black and stays black, no sign of life at all, you may have one of many tv's with faulty capacitors on the Power Supply Board. Capacitors are responsible for distributing specific amounts of power to a tv's components. That would explain why you have sound but no picture. Most likely, capacitors that send power to the screen have failed.

You have a few options. The first and most obvious is to have it fixed by a pro. The second would be to replace the faulty PSB. The third option would be to replace individual capacitors.

Good luck

Let me know if I can help further.

Kaufman605

Feb 14, 2011 | Samsung Televison & Video

1 Answer

Samsunb 4051: TV screen turns off sound stays on.


Most likely this set has an "integrated" inverter, as most samsungs do--and this DOES sound like an inverter problem. Make SURE thought, there are no more bad "10 volt" caps on the power supply...ALL of them need to be replaced no matter HOW they look.

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My Mitsubishi VS50501A Rear Projection TV turns on then off!


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Capacitors on the power pack are going bad they need to be replaced that should fix the problem.

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TV shuts off within 5 seconds of turning on


I had a similar problem with my Phillips 42 in. LCD HD TV.

Here's the problem. The Power Supply Board. I opened my TV up(warranty was up of course) and found several bad capacitors. Phillips and several other companies were sold capacitors that although were highly rated failed within 5 years because of a lack of preservatives. All sorts of electronic equipment is now being effected due to these defective capacitors.
Solutions?
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.

Hope this helps

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TV picture was warped, no it is black, but the power light remains on...


the problem you are having is in the power supply you can go ahead and take your set to a repairman o look at your set good luck.

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