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Repairing an LG 42 LH3000 LCD TV That Shows No Signs of Life (by Vincenzo75)

Did your LG TV stop working and go completely dead—no lights, no sound, no picture? In this guide, a user shares their step-by-step experience trying to bring their lifeless LCD TV back to life. With a bit of patience, some tools, and the usual DIY care, it might be possible to fix it instead of tossing it out too soon.

Appliance:
LG42 LH3000 LCD TV

Issue:
The TV shows no signs of life.

Repair:
After taking some measurements, I discovered a blown fuse rated at 1.5 Amps, 250V. I replaced it, thinking I had quickly solved the problem—but unfortunately, that wasn't the case, as the TV burned the new fuse as soon as I powered it on.
Further investigation revealed the problem was with the 5N50FT MOSFETs (refer to the second photo). I replaced all four of them, and the TV started working again.
I was lucky this time, as the STR W6252 integrated circuit (refer to the third photo) usually gets damaged as well.

 

Detail of the inside of the TV

Detail of the 4 replaced mosfets

detail of the integrated circuit that did not burn out

Thank you
Vincenzo75.

Warning!

The advice and instructions provided on this site come from hobbyists rather than professional technicians, meaning there is no guarantee that they are accurate or represent the best solution.
Additionally, using the tools and techniques described here should be done with careful consideration of one’s own abilities.
These articles assume that the tasks will be performed by individuals with the necessary skills and knowledge to use the required tools safely, without risking harm to themselves, others, or property.
Therefore, the owners of this site cannot be held responsible for any direct or indirect damages resulting from the application of the content found here.
Before undertaking any DIY activity, it is strongly recommended to read the Safety Notice, which provide a basic (though non-exhaustive) list of precautions to follow.

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