A regular customer who is a cctv technician called me on phone to meet him at his client house, on which getting there, this 43″ combo led tv was shown to me with complaint of no picture, but there is audio. When i flash my flash torch light on the screen i could see traces of faint images which indicates it’s backlight problem.
So i carried tv to workshop, removed back case of tv and on visual checks, i noticed e- caps on backlight circuit had bulged. (Let me point out here the brightness of backlight had been defaulted to 50% by the manufacturer.)Moreover when i checked the backlight voltage from connector pins, it reads just 15V.
The bad e- caps values are 220uf/50v ×2, 470uf/16v, however i don’t have 220uf/50v in stock, so i had to use 220uf/35.
But before i use this, i did measure the voltage across the positive pin of cap on board which was 30V, so i did assume 220uf/35 should be able to work for it….I stand to be corrected guys.
After replacing bad caps and powered tv, it came on beautifully, picture below. This’s the finished repaired work.
This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.
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