[TechAssist] Re: Repaired: Follow up: Sony Proj. KP-43T90 Chassis RA-3B. No video, sound ok, OSD / menu is bowed, mis-converged.
- From: "Robinson Electronics" <RobinsonElectronics@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 14 Dec 2005 14:07:34 -0500
Cause was the +5v. filter capacitor C666 (bad) 2200uf. 10v. for the
regulator IC653 - 7805A.
Voltaged on several connection points measured only 3.6v.
Caused all kind of symptoms with this set.
Replaced C666 - cured all problems.
Thanks to all who responed to this email, appreciated very much.
David.
Robinson Electronics
1075 Sweeten Creek Road #51
Asheville, NC 28803-1757
Ph./Fax. 828 274-3787
Toll Free. 1-888 ROBELECT
www.robinsonelectronics.com
www.robelect.com
Mailto: RobinsonElectronics@xxxxxxxxxxx
----- Original Message -----
From: "Robinson Electronics" <RobinsonElectronics@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, December 10, 2005 2:41 PM
Subject: Re: Help: Follow up: Sony Proj. KP-43T90 Chassis RA-3B. No video,
sound ok, OSD / menu is bowed, mis-converged.
> Still working on this set for a good customer of mine, has been a
headache!
> The only voltage fault I can find is the low +5v. on the connector CN202
to
> the "A" board, measured only 3.6v.
> Could not find a test point (TP) on the "G" board to check the main +5v.
The
> standby +5v. is good.
> I subbed out a good "A" board from a good know set, still same problem, so
> the problem is localized to the "G" board somewhere.
> Can anyone help with this? Or any tips on what to check?
>
> So far changed:
> Both conv. IC's., all the pico fuses were ok, though (must not have been
bad
> though).
> Flyback xfmr. and h.o.t.
> Resoldered serveral connections on def. circuit, but didn't look to bad.
> Thanks for any help. David.
>
>
> Robinson Electronics
> 1075 Sweeten Creek Road #51
> Asheville, NC 28803-1757
> Ph./Fax. 828 274-3787
> Toll Free. 1-888 ROBELECT
> www.robinsonelectronics.com
> www.robelect.com
> Mailto: RobinsonElectronics@xxxxxxxxxxx
>
> ----- Original Message -----
> From: "Robinson Electronics" <RobinsonElectronics@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, November 27, 2005 9:44 PM
> Subject: Follow up: Sony Proj. KP-43T90 Chassis RA-3B. No video, sound ok,
> OSD / menu is bowed, mis-converged.
>
>
> > Anyone have any tips or notes on this chassis, working with out a
> schematic?
> > These voltage test points G board check good:
> > TP 19v. (ok)
> > TP +15v. (ok)
> > TP -15v. (ok)
> > TP 11v. (ok)
> > TP -12v. (ok)
> > TP stby 5v. (ok)
> > TP 200v. (ok)
> > TP 135v. (ok)
> > On G board connector CN202 to A board CN501
> > the -5v. (ok)
> > but the +5v. measures only 3.6v!
> > With clip CN202 lifted +5v. measures 4.3
> > Going to check the 9v. supplies on the A board tomorrow.
> > Maybe someone has ran into this before, or can help?
> >
> > Robinson Electronics
> > 1075 Sweeten Creek Road #51
> > Asheville, NC 28803-1757
> > Ph./Fax. 828 274-3787
> > Toll Free. 1-888 ROBELECT
> > www.robinsonelectronics.com
> > www.robelect.com
> > Mailto: RobinsonElectronics@xxxxxxxxxxx
> >
> > ----- Original Message -----
> > From: "Robinson Electronics" <RobinsonElectronics@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, November 21, 2005 7:32 PM
> > Subject: Sony Proj. KP-43T90 Chassis RA-3B. No video, sound ok, OSD is
> > bowed, mis-converged.
> >
> >
> > > Can one of you Sony Techs help us out with this set?
> > > Set powers on with a blink code of 6 blinks, then led stays on but no
> > video
> > > at all, sound is ok though., and the OSD comes on but is bowed and not
> > > converged. I changed both of the convergece ic's anyway (not the
problem
> > > though).
> > > Has anyone encountered this, that can help us, or offer some possible
> > > problem areas?
> > > Thanks. David.
> > >
> > > Robinson Electronics
> > > 1075 Sweeten Creek Road #51
> > > Asheville, NC 28803-1757
> > > Ph./Fax. 828 274-3787
> > > Toll Free. 1-888 ROBELECT
> > > www.robinsonelectronics.com
> > > www.robelect.com
> > > Mailto: RobinsonElectronics@xxxxxxxxxxx
> > >
> >
>
-----------------------------------------------------------------------------
This Email List is accessible to the general public through search engines.
Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
- » [TechAssist] Re: Repaired: Follow up: Sony Proj. KP-43T90 Chassis RA-3B. No video, sound ok, OSD / menu is bowed, mis-converged.
