Re: Testing a TV with Yoke Removed

Agreed: unless the CRT has a direct short internally the HV will be
contained within the Glass Packaged Capacitor called the CRT. However you
will not want to come into close proximity to the CRT Pins while doing this.
If the CRT indeed is shorted the Uthor Voltage will occasionally be
available directly at the pins. This procedure is used when diagnosing
problems within RPTV devices to not induce the CRT Burns, Etc related to
deflection circuit failures.
"James Sweet" <jamessweet@xxxxxxxxxxx> wrote in message
news:BEspe.13241$yS2.874@xxxxxxxxxxx
>
>> >
>> hmm, unplug the CRT board?>, since it looks like there are
>> some dangerous idea's being past around! what happens to the
>> voltage on the anode while you have this CRT board unplugged?
>> i mean, disconnected the yoke and firering it up don't seem
>> to be a problem here! i can only assume your going to fire up
>> the TV with the anode voltage on the CRT while the CRT board
>> is off?,
>> i wouldn't want to be the one working in the back of that set
>> at that time!
>>
>
> Nothing at all happens, with the neck board unplugged the CRT cathodes
> aren't heated, no current flows, the pins are dead. If you *do* get any
> arcing then the tube is up to air.
>
>


.

Relevant Pages

  • Re: Zenith SA2539P Green Picture
    ... The drive and output transistors are on the main board ... I have an old CRT tester however no ... I may try to build one out of an old crt board ... the signals and see what sort of peak readings I get. ...
    (sci.electronics.repair)
  • Re: Sony TV - picture remains black.
    ... >often associated with a weak picture tube. ... But the CRT on this set ... I had suspicions about a weak CRT prior to this failure. ... I'll check the CRT board to see if anything shows up there. ...
    (sci.electronics.repair)
  • Re: JVC 36" T.V.
    ... >CRT board, now red is fine, but if G2 is even close ... >to normal setting, CRT arcs blue in the neck, lower ...
    (sci.electronics.repair)
  • Re: JVC 36" T.V.
    ... >CRT board, now red is fine, but if G2 is even close ... >to normal setting, CRT arcs blue in the neck, lower ...
    (sci.electronics.repair)
  • JVC 36" T.V.
    ... CRT board, now red is fine, but if G2 is even close ... to normal setting, CRT arcs blue in the neck, lower ...
    (sci.electronics.repair)