Re: Toshiba TV problem?

On Jan 7, 10:56 pm, "Forrest" <REMOVETHISrunforre...@xxxxxxxxxxx>
wrote:
"b" <reverend_rog...@xxxxxxxxx> wrote in message

news:e90b06d6-d5c1-43ea-835c-20ee71f4b49e@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

On Jan 5, 11:41 pm, "Forrest" <REMOVETHISrunforre...@xxxxxxxxxxx>
wrote:
I have a 32 inch Toshiba TV (CX32D60) vintage 1994. It developed a
problem
with the vertical aspect of the picture. It started after a local power
failure. I, in my infinite wisdom, ran an extension cord out to the car
and

If  You can solder and have access to capacitors then this is likely
fixable. 99% of the time what you describe is due to one 20 cent cap!

don't bother with ESR meters unless you plan on fixing tvs regularly,.
just change the caps near the frame /vertical IC. there aren't many
and they arent expensive. look for a small ish IC, usually on a metal
heat sink with anything from 6 legs. ( older sets used a pair of
transistors but this is doubtful in your case).

tip:  if the ic is labelled say IC 401, then change all the nearby
caps similarly labelled , eg c405 c408  etc etc. do them one at a time
so you don't mix them up. good luck

Thanks for the replies and advice but I haven't quite figured out how to
start without either killing myself or trashing the TV. One or two things
I've read say to just short out the caps and picture tube. Then I read all
this stuff about using certain resistors to do it. Like this:

For the CRT, use a high wattage (not for power but to hold off the high
voltage which could jump across a tiny 1/4 watt job) resistor of a 1 to 10 M
ohms discharged to the chassis ground connected to the outside of the CRT -
NOT SIGNAL GROUND ON THE MAIN BOARD as you may damage sensitive circuitry.

Do I need to go to an electronics store and buy some resistors before I
start and if so what do I want?

More important than the resistors, I think, is to have something that
will allow
you to safely make electrical contact with the high voltage clip on
the tube.
This is usually under a large, rubber-like cap. You need something
that will
allow you to poke under that cap and touch the clip while electrically
insulating
you from high voltage, also bearing in mind that you're scraping
against a glass
tube (so it shouldn't have any sharp edges). Obviously (I hope) a
long screwdriver
is out, since its metal shaft would be bringing the high voltage
charge close
to your hand. All sets probably use built-in discharge circuits, but
I never trust
those - I just feel safer knowing I've discharged the tube myself.
.

Relevant Pages

  • Re: Homebrew ^V^ amp, which preamp triode for nil microphonics?
    ... the preamp heaters off well filtered dc. ... is your grid cap wire well shielded? ... ohm resistors, or use heater balance pot ... see fender schematic for power tube grid balance pot circuit. ...
    (alt.guitar.amps)
  • Re: TUBE AMPS RESISTORS AND CAPACITORS ??
    ... What about RESISTORS? ... I intend to build a tube based guitar preamp. ... I mean except of high voltage for capacitors when apply. ...
    (rec.audio.tubes)
  • Re: "mild arthritic changes" indeed
    ... One item we made was packaged high voltage, ... Primary power was applied through a Variac with a LONG cord! ... there without an arc popping the breaker, ... take a while for the bleeder resistors to discharge those caps! ...
    (alt.sysadmin.recovery)
  • Re: Alternative OPT current balance method
    ... imbalance with series tube PP amps. ... you can have a series pair with an OPT which is cap ... Just about all PP OPT set up conventionally are intolerant ... the greater the inductance that can be achieved ...
    (rec.audio.tubes)
  • Re: 6K8 Sensitivity
    ... replacing a bad tube. ... Audio first stage? ... A fair number of some of these tubes have, as the cap, the ... If the cap is the control grid of the mixer, ...
    (rec.radio.amateur.boatanchors)