[TechAssist] Re: [Fwd: saga continues: callback!Re: partial fix,update:Re: upda
- From: "John Florea" <Watcher000000000@xxxxxxxxxxx>
- To: "techassist" <techassist@xxxxxxxxxxxxx>
- Date: Wed, 14 Nov 2001 00:15:47 -0800
Sometimes monitor's have a problem with the horizontal at cartain resolutions
and certain video cards. It might be that whatever video card they are using is
causing the horizontal to fail. It wouldn't be the first time I have seen this.
John Florea
Affordable Electronics.
Tumwater Wash.
----- Original Message -----
From: Phil Bader
Sent: Tuesday, November 13, 2001 3:12 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] [Fwd: saga continues: callback!Re: partial fix,update:Re:
update Re:Gateway Vivitron 21 (fcc# BGBTHN9105K)smoked,dead,was
off-H.freqintermittantly]]]
-------- Original Message --------
Subject: saga continues: callback!Re: partial fix,update:Re: update Re:
Gateway Vivitron 21 (fcc# BGBTHN9105K)smoked,dead,was off-H.freq
intermittantly]]
Date: Tue, 13 Nov 2001 17:59:26 -0500
From: Phil Bader <philbad@xxxxxxxxxx>
Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
To: Electronic Hardware Repair <ELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
References: <3BF05715.CCB91250@xxxxxxxxxx>
Ran two days solid OK here. Customer picks up, has 4 hours,finds he has
a virus,is repeatedly rebooting PC, Monitor shows off-frequency display
at one certain boot up,then dead. Put on bench again today: the 11 volt
zener I replaced was OK,but my HOT and FET shorted again. I'm
depressed.Don't know if it was anything customer did,or what...If
there's a GOD, I need advice...
Phil Bader wrote:
>
> Tear down again! Found the daughter board (OSD)I removed to access the
> FET and surrounding parts in orig. repair. Remove and reseated. Width
> trouble cured.
>
> -------- Original Message --------
> Subject: [Fwd: partial fix, update:Re: update Re: Gateway Vivitron 21
> (fcc# BGBTHN9105K) smoked,dead,was off-H.freq intermittantly]
> Date: Sat, 10 Nov 2001 11:34:12 -0500
> From: Phil Bader <philbad@xxxxxxxxxx>
> Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
> To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
>
> -------- Original Message --------
> Subject: partial fix, update:Re: update Re: Gateway Vivitron 21 (fcc#
> BGBTHN9105K) smoked,dead,was off-H.freq intermittantly
> Date: Sat, 10 Nov 2001 09:15:32 -0500
> From: Phil Bader <philbad@xxxxxxxxxx>
> Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
> To: Phil Bader <philbad@xxxxxxxxxx>
> References: <3BD6FC1E.34112ACF@xxxxxxxxxx>
> <3BD86BC5.3A4623DA@xxxxxxxxxx>
>
> Replaced shorted 11 volt zener D528, FET Q521 (2SJ307) and HOT Q506
> (C5244A). Seemed OK on test generator. Today I entered menu,tried to
> increase H. Width more. The OSD goes from 0-100 but no change.( a very
> slight linearity change) Its a bit narrow by an inch or so both sides.
> It's not the inch, it is the fact I cannot change the H. width,
> indicating still a problem. No schemo...PLease help. TIA, Phil.
>
> Phil Bader wrote:
> >
> > Here's what I have found: The short in the HOT collector line was due to
> > a shorted zener diode D528 (A-11 on body)Unsolder zener,short gone. D528
> > is in the source lead of shorted FET Q521 (J307). So, I know I have a
> > shorted Q506 HOT (C5244A),shorted Zener D528,shorted FET Q506 (J307).
> > Don't know what else.Don't find any other shorts. I need to find the
> > value of the zener diode,and if the HOT C5244A has a suitable sub.I
> > think B&D has it @ $20.00! I assume the FET is a 2SJ307. Thanks for any
> > input.
> >
> > Phil Bader wrote:
> > >
> > > This was an intermittant problem for a long time. Would go off freq on
> > > 800x600 ( probably all modes,but this was his "working" res.)sometimes
> > > work all day.Customer said last night it smoked and went out totally. I
> > > see no heated areas top or bottom,or source of smoke/burnt areas. I do
> > > have a shorted HOT Q506. Unsoldering Q506 collector lead I still get a
> > > short on the collector trace on board (HOT is also bad). I think I have
> > > a shorted FET Q521 at the middle of board. A row of FET's near HOT are
> > > all OK (Q517,518,519,520)No scan caps seem shorted. Lytics are not
> > > bulged,tho I havn't ESR'd them yet (Many).This is a bear to get into. Is
> > > there any info on these bad parts or the orig. instability that must
> > > have lead to this? TIA, Phil
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