Question about Coby Televison & Video
Turned it off, unplugged it
Could be that one of the power supply's outputs is going out of regulation.
While unplugged, remove the back of the set; normally 8-10 #2 Philips screws.
Locate a block of parts with several plugs plugged into it, this should be the power supply.
Look closely at components with a cylindrical case with aluminum visible on their tops.
Note that these parts have a scored 'Y' on the aluminum; this will split open to relieve pressure if the part fails.
Look at each of these, they should all be flat on top.
Any showing a bulge are dying or already dead.
If you or a friend have any soldering skills, this block, the power supply, can be removed from the mounting for repair.
The parts that fail are cheap but will likely fail again due to a design flaw or just lousy parts.
This can be often prevented by adding (under the board) a multi-layer ceramic capacitor with a value of 0.1 to 0.47 uFd parallel to the replaced capacitor. Voltages on these will be 50 VDC or lower and anything above 25 VDC will be fine.
This will protect the chemical (electrolytic) capacitor from trying to deal with high frequencies which cause this kind of failure.
Posted on Nov 20, 2014
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Posted on Jan 02, 2017
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