You Will Be Stunned Of What’s Found Inside The TV (No Power Fault)
This 32″ Videocon LED TV came in with the complaint of no power. I’d tested it and indeed it was no power. The next was to open up the cover and measure the main fuse. Below is the photo of the power board integrated with the mainboard:
The main fuse was checked and found it to be opened circuit. The reading of the meter showed 000 Ohm which mean the fuse was bad.
Before I proceeded to check on other components, I took out the circuit board and flipped it backward. I got a shocked to see a burnt dead lizard. From the side it looked like a tiny Godzilla! The lizard went inside the TV probably due to the warm environment.
I believe is the heat from the components that had attracted the lizard but it went into a wrong place. It went straight to the AC source killing it instantly. This had caused the main fuse to blow.
I removed the dead lizard with a plier and took out a bottle of PCB cleaner to clean the affected area.
Next I checked on all the components in the corresponding which included the Bridge Rectifier diodes, power FET, Varistor and etc. All the components were tested good. If you want to learn how to test all these components I can recommend Jestine Yong’s ebook HERE.
Since there were no bad components found, I had to connect a 40 watt light bulb in series with the fuse holder to check if there is any other components that was shorted. The bulb lighted for a while and went dimmed and I could see the red LED standby turned on.
This indicated that the power supply no longer have shorted components and I can place a new fuse and then turn the set On – see the two photos below:
Once the fuse was replaced and power was applied, I could see the picture in the screen.
Conclusion- Once you know the electrical safety and the right way to test components, you can actually start the board repair work. If you wish to be good in power supply troubleshooting and repair you can check out Jestine’s SMPS repair 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/blur-picture-in-tv-repaired/
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Parasuraman
June 25, 2018 at 11:21 pm
A lizard inside LED tv is very surprising. How did it manage to sneak in! In fact normally, there won't be such holes! Anyhow, a good job! Well done!
LG
June 26, 2018 at 12:49 am
good work sir.I survive. by your knowledge
Mihai
June 26, 2018 at 12:49 am
Good job Suranga !
Albert
June 26, 2018 at 10:10 am
I'm sure glad we do not have any lizards in our country. Good job but normally 0.00 on a
digital meter should give a value of zero ohm and means it is a good fuse, but here with the
function selector set to maximum 500V scale measurement doesn't it measure the resistance of the fuse.
HICHAM CHAMSI
June 28, 2018 at 2:01 am
Well said ALBERT, everytime you give the good remark. thanks to all.
Robert Calk Jr.
June 26, 2018 at 11:32 am
Thanks Suranga. Poor lizard!
Justice
June 26, 2018 at 7:08 pm
Very interesting and educational information. Its so nice to read your articles Suranga keep it up.
James
June 28, 2018 at 5:18 pm
Awe''' the Geico lizard finally ate the big one'' :[) LoL
wills
July 3, 2018 at 3:24 pm
nice one. I have one TCL CRT Tv with a horizontal pulling picture problem, i have tried i could not repair it, I request u to help me out on this problem what is the cause/symptoms of this problem?