The tv screen goes blank at random. sometimes we have the sound and some times we dont have it. this occurs mostly after watching it for 1-2 hrs. but some days it runs entire day without any problem but sometimes it doesnot even run for 15 min. the lg serviceman came 2-3 times but couldnot solve thew problem
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It might be a loose solder connection inside,try to prove it,the next time it goes blank,firmly give a whack to the back or bottom of the set,if it flashes back......sholud be a loose solder conn that a competent technician can find and repair
It is probable you have a poor soldered connection on the power supply board, hence the erratic timing of the TV going on & off. If you are competent with a soldering iron look for dry jointed soldering on the board. If not have a service engineer take a look at it for you.
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
cold solder joint on the power supply or in the vert curcuit. If you know anything about the proceder to troubleshoot cold solder connections GO for it but if you dont and dont wanna cause any other problems with the set My advice would be to take it to a pro before any other problems arise if they already havent. Its not a major repair most of the time.