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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Note: You may check out his previous post in the below links:
https://jestineyong.com/simple-way-to-repair-color-problem-in-led-tv/
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Parasuraman
March 29, 2018 at 4:27 pm
As usual, very professional easy fix because of your expertise?
Justice
March 29, 2018 at 5:47 pm
Thanks once again for this article always informative.
charles
March 29, 2018 at 7:32 pm
Thank you sir for a detailed article always learn something new on your repair reports.
Albert van Bemmelen
March 29, 2018 at 11:26 pm
You forgot to mention in detail the most important part being what Universal LCD Inverter Board you bought? And some schematic or datasheet of that part would be very helpful too.
Tyrone.
March 30, 2018 at 4:55 am
Very good repair Suranga.
Robert Calk
March 30, 2018 at 9:58 am
Good job, Suranga.
Kigoma charles
March 30, 2018 at 6:36 pm
Thank you,i have learnt some thing new and i want to assure you that i have ever faced with the same problem and i replaced the capacitor but with in a short time it heats up and burst.
Charles from Uganda
Obar Salazar Pérez
March 30, 2018 at 11:47 pm
muy interesante este caso y es parecido lo que le tocó a un colega técnico
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very interesting this case and it is similar what it was to a technical colleague
Andrew F. Ali
March 31, 2018 at 12:57 am
Excellent repair Suranga. Sometimes I convert the LCD CCFL Backlight TV to LED Backlight TV. Finding and using the same 4 inputs to power the Universal LED Driver Board Sometimes I have to include the Adjustable Step-up DC-DC Converter the bring up the 12Vdc from the PSU to 24Vdc to supply the LED Driver. It costs more as I have to replace the CCFLs with LED Strips. However, I have found it to last longer and makes the TV to use less power. Thanks for a good read.
Yogesh Panchal
April 6, 2018 at 3:43 pm
Good job! Suranga.
Ulises Aguilar
July 22, 2018 at 12:16 pm
grate Job Sir keep it up