Tip & How-To about LG 32LN530B 32" 720p LED-LCD TV - 16:9 - HDTV

TV led back-light repair

Tv using power supply unit EAY62810301.

No back-light/sound ok.

No dc voltage measured at P801 led plug.
New board did not fix.
Remove display panel.
With face up, panel will hinge up. (after removing all trim parts) Place folded towels beneath, to prevent strain on tcon ribbon.
Fold other screens up and over on top of display to keep them in right order. Including white background reflector.
Check each series led string with 2*9V batteries and series resistor, minding marked polarity.
Circuit consists of 3 strips of 7 leds all in series.
One bad led disables all .
Check each led of bad string. I used 18V and 1K ohm.
Replace strip or jumper (short) bad led. I just jumpered the bad one that was on edge of panel. (first in string).



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LG 32LN530B 32" 720p LED-LCD TV - 16:9 - HDTV Logo

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Samsung UN65EH6000FXZA (Version YH02)


There is three possibilities:
1. Defective back lights LED strip.
2. Defective LED driver section integrated in the main power supply.
3. the main board.

How to check it:
1. You need a LED back lights tester to check the strips, or open the panel, use a 3.7 V DC power supply to test each LED diode separately.
2. Use a multi meter to test the out put DC voltage from the connector to the LED strip between the + & - for each section, (like 1+/1-, 2+/2- etc.) it should read 140 - 220 V DC. (need power up the TV).
3. Un-plug the cable between the main board & the power supply, power up the TV, if you get the back lights light up, the main board is bad.

Aug 11, 2017 | Samsung Televison & Video

1 Answer

How do I fix my LCD TV?


If you hold a flashlight up to the screen do you see any image or video

May 13, 2016 | LG Televison & Video

1 Answer

LG 32LB530A Tv sound ok faint picture Led backlid off


Hi,
Back light led driver or the led array is faulty. check and confirm the voltage to the led back light from the power supply. normally 35V to 100V according to the brand and model of the tv. Check the voltage if the voltage is somewhere around the above mentioned voltage the then the tv have problem with the led array behind the screen . If the voltage is missing then the led driver is faulty. Normally the led drivers is found integrated to the power supply board. If so then you have to replace the power supply board as a whole.
www.electro-medical.blogspot.com

Oct 10, 2015 | LG Televison & Video

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