Big Screen TV Help

[Steve]

Hi,

I have 2 big screens and both are not working at the moment.
I have had them for a while in the garage and just decided to crack
them open.

1st is a Pioneer Model SD-P403


Power comes on but no picture . Lights in the tubs tend to seem kinda
dim.
Checked the power board and one of the 4 fuses were blown.
Replaced the fuse and turned power on and it made a kinda hi pitched
noise and then kicked off and would not come back on unless unplugged
and then plugged back in. Still no picture. ??



2nd is a LXI Model 626.54452850

Power comes on but no picture. When you turn the power on you hear the
tubes kick in (static crackle sound) Checked the power board and there
are no fuses but there is a relay that clicks 1 (assume stopping power
to? ) time about 4 seconds after the power is turned on (this is when
you hear the tubes go dead (no more static crackle sound)
I am guessing that there is too much power causing the relay to cut
power to the tubes?

Thank in advance for your time.

Please respond to :
Steve Smith
Florida (Email address does not have spaces)
Pay4Back @ aol.com

 

[b]

Hi,

I have 2 big screens and both are not working at the moment.(snipped)

Your first unit seems to have a short on one of the outputs of the
line transformer(flyback), maybe a shorted diode or even the vertical
IC which results in the squeal and protective fuse doing its job.
Could be the line transformer itself at fault. By the way I take it
you replaced that fuse with one of the same rating...?

sounds like the second unit goes into protection mode also, probably
due to a similar fault in the deflection or High voltage area, voltage
regulator, dry capacitors.....

These are my generalised guesses based on past experience. In truth it
could be any number of things causing these symptoms.

From what you say, both units seem to have startup drive but may well
have faults in the deflection which lead to the unit shutting down.
Unless you have experience with TV repair this is not something you
will be able to tackle safely and effectively. Take the sets to a
local repair shop and get a proper estimate. Then you will be able to
make an educated decision about whether to go ahead with a repair.
Bear in mind the age of the sets and I would not recommend spending
more than about 30 percent of the cost of a new one.

These problems are not easy to diagnose or treat over the internet.
Good luck
Ben