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Samsung TV with audio but no picture and no LED backlights. Flashlight test reveals screen image present. No signs of internal damage or disconnected wires. Suggestions?

I have a 28" Samsung TV (model UN28M4500AFXZA- version BB02, 2017 manufacturer date). The TV plays audio from all sources but it displays a black picture/no picture. The flashlight test in a dark room reveals a screen image is visibly present but there are no LED backlights visible on the rear of the TV. I disassembled the TV and no visible signs of damage on any boards, disconnected wires, etc. The toggle switch on the rear of the TV does not function to power up the TV so only recourse is to power on with the remote. ShopJimmy video tutorial suggests highly likely issue is with the "LED Driver" and not the main board or the t-con board. This model does not have a traditional power board but does have an AC adapter. Wondering if the toggle power switch (the part is referred to as a "P-Function Board" on ShopJimmy) is the culprit as it doesn't operate or if the LED backlight strips need to be replaced or perhaps both need to be replaced? Suggestions?

Posted by Mark Steeby on


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The Knight

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SOURCE: 2nd try see last sentences....lg led 32ln5310 tv, sound but no picture, no backlights, nothing visible on flashlight test, what should I replace? Main board, T-Con Board, Power Supply board or Leds

The main power supply regulator section circuit fault. 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. Pull up older posts. It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Posted on Feb 10, 2017


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