Toshiba 48" Projection TV possible capacitor problem model #TP4871B

[30W]

Hello all I was hoping someone here might be able to help me out on a
little problem I am having with my TV. On the tv there is a small
line going across the screen which goes away after 10 minutes of being
powered up. My wife called a television repair man and he wrote down
on his receipt "Needs vertical rebuild capacitors bad" and he wanted
to charge $400.00!!!! I am an electronics tech but never worked on a
TV before so I thought I would look over the pcb to see if I see any
bulging or leaking caps. All the caps seem fine, I even took a few out
and measured their capacitance but realized after reading up on ESR
that is not totally reliable. I had repaired a grainy arcade monitor
once for someone but all I did was change every single electrlytic cap
on the board and it did the trick. Anyone know like a certain position
that the caps the repairman are referring to might be in? Like near a
hor/ver. transistor?


Also one last question I know working with tube televisions you have
to be careful of the high voltage. Someone told me with a projection
TV there is no high voltage stored once the TV is off because there is
no tube. Is this true? If not good thing I have been treating it like
it is charged.


TIA for any help!!!

 

[Rono]

The capacitors in question are by the vertical IC!
The IC is probably bad, & check the supplines of
12, & 24 volts! Diode may be shorted, resistor open,
& caps by the IC likely bad! Rono.

 

[30W]

Thanks Rono ill take a look at that. I was hoping the pcb would be
labeled as what section controlled what. I guess I will order the
schematic from sams and see whats controlling what.

Thanks Again

 

[Jeff Rigby]

Thanks Rono ill take a look at that. I was hoping the pcb would be
labeled as what section controlled what. I guess I will order the
schematic from sams and see whats controlling what.

Thanks Again

Vert out is usually a vert mounted IC with 8 to 13 pins. $400 for repair,
call another servicer. We generally charge $150 TOTAL for the repair in the
home. There are some cases where it need shop repair and that's about $220.

In your case it's probably a bad connection or a bad cap, parts cost $6.00

 

[30W]

Yeah thats what I figured. The TV had two main PCB's and I think im
looking at the wrong one. I looked up the standing IC with maybe 10
pins and it was an audio amp so im figuring the board i was looking at
was the sound board. So now im going to pull out the other pcb with
the fly back transformer on it. I was delaying on that board because I
am still not sure if there is high voltage or not after the TV is off.
Its a projection TV and I was told only tube TV's store that voltage
but still want to play it safe. If I remember right it did not have
any high voltage warnng stickers, im at work so I cant check right
now. Do you know if there is high voltage in projection tv when it is
off? Thank for your help Jeff.