Question about LG Televison & Video
Symptoms: no audio, no video, no backlight. Diagnostics performed so far: Power light goes blue/blue white from the standard solid red/orange when powered on with remote control. audible click is heard during the power on cycle, no blink code noted. Flashlight test fails to show anything have disassembled and put light behind the panel as well still no image seen on power up cycle. When powering up after power indicator led has turned blue/blue white TV with back off of unit I press the single black button on the mainboard and i get a momentary flash of the backlights then TV powers down. I i do previous test with allowing tv to power up and stay in blue power indicator status for 1 min or so the button push yields no led backlight flash. Power on TV do or do not not press button on mainboard plug in lan cable to switch or laptop and activity is seen in both cases. Power on and plug hdmi 1 (only port I checked) in to laptop windows recognizes the tv as a second monitor. Voltage through to main board from power supply is 3.46 if i recall correctly on 2 leads into the mainboard from power supply/backlight driver combo board. Voltage out to led cables from powersupply/led backlight driver board is 56+ VDC if i recall correctly on multiple pins / leads. Can I verify with you that this would likely be a failure in what I am seeing referred to as a t-con board?
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.
Posted on May 12, 2017
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Posted on Jan 02, 2017
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