52'' rca projection screen tv goes on and off, and has a high pitched squeel??? Please Help if you can Thanks
This is most likely the death song of the main power supply. They normally operate at frequencies well above the audible range but certain components in the process of failing can cause their oscillating frequency to shift downward into normal hearing range.
The
squealing you are hearing is from a dying 'switched mode' power supply and
is normally caused by a ferrite-core transformer running at the wrong frequency
and complaining about it.
The
problem with them is almost certain to be caused by failed or failing
electrolytic capacitors (cheap to replace) but continued attempted
operation could cause further damage.
This
problem is common enough that any half-way competent tech with a capacitance
meter could weed out the culprits pretty quick.
I'm
tempted to suggest you get these repaired if they were otherwise satisfactory
since the our later sets too often seem to only survive the warranty.
If
I was doing the repair, I would give you an estimate of under $75. US
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