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LG 42LN40 Dead no lights no standby    
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ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Thu Dec 15, 2011 2:04 pm    Post subject: LG 42LN40 Dead no lights no standby Reply with quote

I have an LG 42" lcd tv that I am trying to restore back to working order. I have taken the back off and have tested the main fuse f100 it tested good. I then tested Fuse f501 and that one was blown. there is a bank of Mosfet FDPF5N50FT 4 of them to be exact. What is the best method for Testing Mosfet's ?
The TV has no lights or any sign of life. the main power switch is in the on position. thanks for any help.
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ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Tue Dec 20, 2011 1:34 pm    Post subject: Ordered new power board Reply with quote

I have ordered a new power board for this. I will keep you posted.
ntehicks



Joined: 25 Mar 2009
Posts: 162
Location: Herriman, Utah

PostPosted: Sat Dec 31, 2011 10:21 pm    Post subject: LG 42LN40 Dead no lights no standby Reply with quote

I gave up on doing a board level repair. could not track down the part or parts that are shorting out the 5 volt line. I put in the new power supply board and the tv fired right up. I have tested it for a week and then returned it to my friend. power supply did the job.
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