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Old 03-11-2017, 06:20 AM   #9
Adriatic
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Join Date: Mar 2017
City & State: Ljubljana
My Country: Slovenia
I'm a: Knowledge Seeker
Posts: 23
Default Re: LG LCD 42LD750 Backlight flashes 4 times, then tv off.

Now this is spooky ?
I recovered PSU board from the dead but only to the point when it starts three times and then stops.
But here is the catch. If I stick probes of DMM to the input of ccfl lamps and set it to AC than TV set starts normally , no shutdown no error etc. It is not pressure or contact related btw and that is what is bothering me. Immediately when I pull out probes from DMM (from DMM not from TV set !) the TV shuts off and show error. Reading are avg at 340V, at start there is spike up to 440V, one thing I noticed is when tv was already running 5 mins or so there was a spike over 1040V ?? DMM complained about it and played a music for me and TV shuted down.
I cannot even tell what am I measuring and why this is happening .
However from the ohm readings, the inverters are fine (confirmed by my 6 year daughter ) but there is one little transformer which is suspect to me but cannot find datasheet for him.
The markings on suspected transformer is LIP-100.SC091111C (third photo)
It shows different ohm reading from second one (all messed up) but it is also in reverse from second one so hmm.

Long story short: Why is DMM causing TV to start normally ???
Can anybody help me. Ohh and sorry for long post.
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Last edited by Adriatic; 03-11-2017 at 06:28 AM..
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