[TechAssist] Re: One last plea...Orion TV2501..press power, retrace, then shuts off.

  • From: "George" <grndmstrg@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 22 Aug 2003 20:26:20 -0700

Jerry,

A typical HV probe with a built in 50uA movement has an impedance of 20k
ohms per volt. I you were checking a voltage between 200 to 400 volts it
would have an impedance of 4 meg to 8 meg ohms which is less than the DMM's
10 meg ohms (at 500 volts and up it equal then beat the DMM's load
impedance). However if you used an add on HV probe with your analog
(typically 20k/v) or digital voltmeter (typically 10 meg ohms)  then the
impedance will be increased by the multiplier value of the probe.

George
Afana Electronics
Moreno Valley, CA

----- Original Message -----
From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, August 22, 2003 10:45 AM
Subject: [TechAssist] Re: One last plea...Orion TV2501..press power,
retrace, then shuts off.


> The main reason for using a high voltage probe is for the high input
> impedance. The 10 megs input impedance of a DVOM can drop the screen
voltage
> in half.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave Greenville SC 29609
> 864 232 3889 Fax 271 2080
> greentron@xxxxxxx
> ----- Original Message -----
> From: George <grndmstrg@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, August 19, 2003 8:38 PM
> Subject: [TechAssist] Re: One last plea...Orion TV2501..press power,
> retrace, then shuts off.
>
>
> > Barry,
> >
> > My Digital meter has no problem reading it, but I suppose there is a lot
> of
> > cheapo DMM's being sold.
> > It's nice to have a good analog multimeter when needed
> > like my Simpson 260.
> >
> > George
> > Afana Electronics
> > Moreno Valley, CA
> >
> > ----- Original Message -----
> > From: "Barry Thompson" <barrystv@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, August 19, 2003 4:56 PM
> > Subject: [TechAssist] Re: One last plea...Orion TV2501..press power,
> > retrace, then shuts off.
> >
> >
> > > Most digital meters won't read it. to much RF.
> > > barrystv@xxxxxxx
> > > Barrys TV
> > > 613 224 3406
> > > Ottawa.Canada.
> > > ----- Original Message -----
> > > From: "George" <grndmstrg@xxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Tuesday, August 19, 2003 7:34 PM
> > > Subject: [TechAssist] Re: One last plea...Orion TV2501..press power,
> > > retrace, then shuts off.
> > >
> > >
> > > > Barry,
> > > > Out of curiosity why would you use a HV probe to measure the screen
> (G2)
> > > > voltage?
> > > >
> > > > George
> > > > Afana Electronics
> > > > Moreno Valley, CA
> > > >
> > > > ----- Original Message -----
> > > > From: "Barry Thompson" <barrystv@xxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Tuesday, August 19, 2003 3:46 PM
> > > > Subject: [TechAssist] Re: One last plea...Orion TV2501..press power,
> > > > retrace, then shuts off.
> > > >
> > > >
> > > > > Did you check the crt for shorts? Did you use a HV probe to check
> the
> > > > > screen?
> > > > > barrystv@xxxxxxx
> > > > > Barrys TV
> > > > > 613 224 3406
> > > > > Ottawa.Canada.
> > > > > ----- Original Message -----
> > > > > From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
> > > > > To: "Techassist" <techassist@xxxxxxxxxxxxx>
> > > > > Sent: Tuesday, August 19, 2003 5:08 PM
> > > > > Subject: [TechAssist] One last plea...Orion TV2501..press power,
> > > retrace,
> > > > > then shuts off.
> > > > >
> > > > >
> > > > > > This unit came in with no picture. I checked the G2 on the CRT
> > > > board....0.
> > > > > When I pulled the G2 lead to
> > > > > > check the voltage, it wasn't present, when I replaced the lead,
> the
> > > set
> > > > > started to work and has worked
> > > > > > ever since.
> > > > > > Only problem now, is when I press power, there is retrace lines
> > > > > momentarily, less than a second, before
> > > > > > the set shuts down.
> > > > > > The only thing I can catch, is the RGB cathodes drop to 20vdc,
> then
> > to
> > > > > 40vdc which is where they stay for
> > > > > > standby.
> > > > > > G2 acts no differently..until the power is gone. I've checked
> > > components
> > > > > in the ABL circuit thinking the
> > > > > > problem may be there and they check OK.
> > > > > > I'm ready to send this set home the way it is, unless someone
> gives
> > me
> > > > one
> > > > > last hope, here....thank you.
> > > > > >
> > > > > >
> > > > > > Jeff Dougherty
> > > > > > Intrepid Video TV/VCR
> > > > > > 263 S Front St
> > > > > > Steelton PA 17113
> > > > > > fax...717-564-4952
> > > > > > www.intrepid-video.com www.tech-repair.net
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
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