[TechAssist] Re: H. P. Monitor (D5258A)
- From: Wally & Sue Heise <sifcamp@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 04 Jan 2002 22:47:01 -0600
Hi Shaun,
Sorry I don't have specific info on this model, but most monitors use
one or more FET's to produce B+ for the various resolutions, trace back
from the primary windings (B+) of the flyback to find these fets or just
visual the board for fets (usually on heat sinks) and located between
the flyback and the smps. More than likely one of these fets or
associated circuitry is bad, also maybe fusible resistors or pico fuses
in their circuits. It is possible to have an open flyback, but unusual
from what I have seen on my repairs.
Good luck,
Wally Heise
South Isle Repair
sifcamp@xxxxxxxxxx
Shaun wrote:
>
> I checked as far as I can without the print on it but it does seem to
> regulate because the secondary voltages are all there.
> ----- Original Message -----
> From: "Rafael Gallegos" <gallegra@xxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, January 04, 2002 8:56 PM
> Subject: [TechAssist] Re: H. P. Monitor (D5258A)
>
> >
> > Did you check the voltage out of the voltage regulator yet? there might be
> =
> > your problem
> >
> > Rafael Gallegos
> > Lead electronics technician
> > Rockford corp.
> >
> > >>> ssroark@xxxxxxxx 01/04/02 08:27PM >>>
> > Hi Techs, I have this Hewlit Packard monitor that tries to come on you can
> =
> > hear HV for 2 sec then it shuts down but the on/display light stays on and
> =
> > is green not yellow. There is only 3-5 v dc on the horz output but the =
> > supply voltage from the secondary of the power supply is 187v dc only =
> > notes I have on this one is replace flyback but i really want to make sure
> =
> > before I tell customer its the flk because usually they wont repair. I do
> =
> > not have a print so any advice or help would be great.
> >
> > Thanks=20
> > Shaun
> >
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