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Samsung led tv model UA40D5900 have black screed no video and audio.power gets on powersupply board physically good no blown capacitors voltages semms ok.baclite getting on. where could be the problem

Power ok backlite getting on, powersupply borad voltages seems ok. screen black no audio video.in the dark we can see light white screen

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Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. 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/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on Dec 03, 2014

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Posted on Jan 02, 2017

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Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

May 04, 2017 | Sanyo Televison & Video

3 Answers

I have an LG 47LN522-UB LED TV that stopped working after three years and need help diagnosing a problem with it.


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.

Apr 26, 2017 | LG Televison & Video

1 Answer

A le-24g90 tv sometimes display ok sometimes black, tested capacitors are ok, when black front panel seems to work fine


Back - light problem. 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.

Aug 04, 2016 | Seiki Televison & Video

1 Answer

Where is capacitor located on TV


There are several.
You should be identifying the four large components
- Power board
- Logic board
- Timing Control (TCON) board
- LED inverter driver board

99% the capacitors you are looking to identify for a power related issue on the power board.
capacitors look like
26155016-a3z50hdvc01hdf5dkelcuavu-4-0.png hope the video below helps you identify the defective capacitors
Fixing the Blown Capacitor in Samsung TV Yourself

Apr 07, 2016 | Televison & Video

1 Answer

Samsung 50" led un50h6350. The TV is about 18 months old and the picture went out, the audio and back light are working. I've replaced the t-con board and that didn't fix it. Someone please help!


Samsung LED TV Screed goes blank periodically for 1 sec - Forums ...

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Are there still capacitor problems with Samsung TVs?


Dec 21, 2015 | Samsung Televison & Video

1 Answer

I have a Samsung Model HPT5054X/XAA 50" plasma TV. the picture went black but still have audio.I purchased a reman Y sustain board.The Y buffer boards looked good. Now when I reassembled the unit,st


Did it work with the Y-sustain board replaced? Likely if it did not work then there is an issue with the capacitors on the Y-sustain board and the power board. Check these caps for failure and replace them with the exact type. Likely the caps are blown and cause voltage loss in one or both boards.

Feb 01, 2015 | Samsung HPT5054 50-Inch Plasma HDTV

1 Answer

How to test the 4 output powersupply on the un55b8500 led tv


First, inspect the electrolytic capacitors on the power supply board. The top of a burned-out capacitor is often domed instead of flat. You may measure proper voltage with no load, but the bad capacitor will not support a load. (Note: the voltages are usually printed on the board next to the output connector.) The page linked below includes a nice illustration of both good and bad capacitors. Also, check the LED driver board for the same problem. If you don't see anything like that, add a comment to the post to that effect, and we'll look at other possibilities.

CapacitorLCDPARTS net

Jun 12, 2017 | Samsung UN55B8500 TV

1 Answer

SONY Trinitron (POWER on. Black screen.)


This is not the flyback, if the model is the one listed in title, it has no flyback, has it is a rear projection. The motherboard is possible, but also C board and D board are likely.

If there is a flashing led on front of the TV, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1 The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the TV will reset just unplugging power cord for one or two hours, sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr suddenly are a blown capacitor on power board, a convergence IC has blown, or a faulty on Digital board.
check also the video cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Check also connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact SonySony Global - "Contact Us".

If you want to repair at your own expenses, just locate any good qualified repairer.


Regards

Mar 06, 2009 | Sony Grand WEGA KDF-42WE655 42" Rear...

1 Answer

Tv wont turn on get audio then tv shuts off timer lite blinking


If TV stays in stand by with audio but no video, then common faults are the ballast board, or a fault on digital board.

If the led stays blinking , and tv turns off then the TV is on protect mode.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

Also ensure that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.

If that does not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.


If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occur are a blown capacitor on power board, a convergence IC has blown, or a fault on Digital board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.


If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

Dec 21, 2008 | Mitsubishi WD-62531 Projection Television

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