Question about Televison & Video
Won't turn on.
Power LED switches between green and red.
Loudspeakers make a tiny pop, so power is getting through, but then cutting
The screen is blank.
Any clues ??
The general problem with LCD type TV's is that the power supply
fails. They are very sophisticated designs that are difficult to
troubleshoot and generally best to just replace the module, but
sometimes there is visible damage in some of the electrolytic
capacitors (visibly bulged) and high voltage rated parts can be
Hope Ya Fix It
Posted on Feb 10, 2008
SOURCE: tv will not power up
it's failing to turn on, the main power supply is probably at
fault and without some technical background and a couple of test instruments,
you will not be able to do the repair yourself.
What you can do though is; unplug the set, let it stand overnight or at least several hours, remove the back panel and look for a separate board with mostly larger components on it; it will have a ferrite core (no laminations as with a line-frequency part) transformer on it and several larger capacitors which are cylindrical and mounted vertically to the board.
Before touching anything inside, especially on that board, allow several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.
If you see signs of overheating such as discoloration of the board material, it may not be repairable but if you can find a part number on the board, you might be able to buy the power supply and install it yourself but it will likely have the same problem eventually unless they have altered the design.
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the power supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload.
Posted on Mar 30, 2009
I had this same problem with my 23" cello TV. It was a problem with the internal power supply - specifically the 12V output. It had fallen to 5V. I noticed that the three electrolytic capacitors (EC7 EC8 & EC9) had bulging tops as though they had been damaged. I replaced these and my TV is now working again although I don't know how long it will last. The three capacitors were 1000uf 16V types. I replaced them with 35V versions (which are physically bigger and a tight squeeze). Your TV repair shop should be able to replace these faulty components in under an hour.
Posted on Dec 19, 2009
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