Question about Televison & Video
Assuming there are no other symptoms:
If this appears after extended operation - an hour or more - it may
just be a build up of dust, dirt, and grime over the years. After
understanding the safety info, some careful vacuuming inside may help.
Just don't be tempted to turn any screws or adjustments!
Dust is attracted to the high voltage section in particular - even the
front faceplate of the CRT collects a lot and should be wiped with a damp
cloth from time to time.
If the symptoms develop quickly - in a few minutes or less, then there
could still be a dust problem - a power resistor may be heating a wad of
it but other possibilities need to be considered.
If not dust, then probably in the power supply but realize that TVs don't
have a nice metal case labeled 'power supply'. It is just a bunch of stuff
scattered around the main board. Without identifying the part that is
heating, a diagnosis is tough especially if the set really does
work fine otherwise. However, if a series regulator were faulty and putting
out too much voltage, the set could appear to work properly but in fact
have excessive power dissipation in certain components. If cleaning the dust
does not solve the problem, you will probably need a schematic to identify
the correct voltages.
You have to take the television to the manufacturer,
Posted on Jun 01, 2010
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Posted on Jan 02, 2017
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