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Sony kdl55hx800 no sound picture. did flashlight test nothing no backlighting. i was thinking it was the power supply

The green light on the front works as well as the optical sound out red light. ive had it on for a while just for fun and it clickes that sounds like it is coming from the power board the green light after about 30 secounds will turn off then on again, makes me believe it is the power board

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Probably a failing power supply

Posted on May 08, 2017

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Posted on Jan 02, 2017

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My LG tv (Model number: 32LS3410-UB) has sound, but no picture. When I do the flashlight test I can see a very dark image on the screen. Will replacing the LED driver fix this problem?


If you already tested with the flashlight which is the first step in the blank screen with sound fault then you have to test the LED Backlight supply voltages if you are familiar and good in the electronic repair. First you have to check if bulging capacitors for the LED Backlight drive voltage circuit, replace them. If capacitors are good then you have check the backlight LEDs. The flashlight test proves that the power supply is good and TV is working fine because the sound is ok and picture is fine. Attached videos and links may help you for the repair and replacement of backlight LED strips or LEDs itself depending on the type of LED strips used in your model.
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Use a voltmeter to verify the different voltages on the power supply board are present within tolerance. Look for discolored , puffy or domed capacitors. Repair kits and complete replacement boards can be had from: TV Parts Universal TV Stands DLP Chips ShopJimmy

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About the Sony Bravia Kdl55hx800 55" Lcd Tv


The 12 volts comes FROM the power supply board.
TV Parts Universal TV Stands DLP Chips ShopJimmy Go to this web site. You will find repair parts kits as well as complete boards there.

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1 Answer

No picture on mu LG television.


Try the old flashlight test, turn off the lights in the room. Turn on the set and flash a bright flashlight on the screen. Do you see the image or is the screen totally black?? If you see the image, then most likely you have a backlight problem. Verify that you have 24V on the power supply for the inverter

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Hi mstevens376,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
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Hope I helped you.
Have a nice day!
Thanks for using Fixya.

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1 Answer

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Sounds like maybe power supply, but I would check with flashlight 2 in from screen when the green light comes on to see if you have a picture, if so then you have a bad inverter board, if not then power supply problems. You can look for bad or bulged caps in PS

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