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Now You Too Can Use Universal LCD Inverter Board
This 32″ LCD TV Eurostar came in with the complaint of no display but the power and the sound were good. If a torch light is used to shine on the display you will be able to see the faint picture but many users did not know about this trick. This kind of problem is usually related to the inverter board problem. If the display comes out and goes dim then you can suspect a weak or bad backlight or even inverter board.
The cover was removed and I could see the three circuit boards i.e; Power, Main and Inverter boards-see the photo below:
From the visual inspection on the inverter board I saw an e-cap was exploded and the value was 470uf 35 volt. I have checked the surrounding components except the high voltage transformer but all seems to be working fine-see the photo below:
After the replacement of the e-cap and powered On, there was still no display but when I touched on the high voltage transformer I could feel it was overheated. Although the high voltage transformer is overheated the e-cap did not explode.
I believe if I turn it On for sometimes it will surely blow again. I soldered out the high voltage transformer and found that the underneath winding was burnt-see the photos below:
The problem now is I do not have the spare part for the high voltage transformer so I had to use and modify the universal LCD inverter board as a replacement. Just tap the 4 important signals such as the brightness/ADJ, vcc, gnd and Enable. When you buy this board you will be able to know the details at the connector pins.
Once done the modification and powered On, the display came back to life as seen from the photo below:
Conclusion- If a repair work takes you lots of time and hard to search for the exact part, you need to find the universal board that can help to solve your problem. If you want to learn how to convert the universal LCD Inverter board in a step by step guide, you can check out Jestine’s ebook HERE.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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