[TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical Distortion Top of Screen - FOLLOWUP
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 14 Apr 2005 08:56:15 -0500
OK David,
it was a shot in the dark as I said I couldn't remember the chassis I had
problem with.
Must have been older than yours
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, April 14, 2005 8:32 AM
Subject: [TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical Distortion
Top of Screen - FOLLOWUP
> Could find D559 on this chassis even with the glasses on. The problem
> here is instant, no warm up required for the problem to occur. Wouldn't
> the whole horizontal sync be out of whack and not just the top 1" if the
> horizontal hold circuit was failing?
>
> I hate second guessing myself however I've looked at everything. Could a
> bad vertical IC cause this problem?
>
> David Lessard
> Alexandria, Ontario, Canada
> Mr_fixit@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of tvservice
> Sent: Wednesday, April 13, 2005 3:04 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical
> Distortion Top of Screen - FOLLOWUP
>
> look for a diode D559 near flyback
> IF it has one replace with NTE177 or 519 or equivalent
> fast switching diode.
> Don't remember what chassis version it was, but I have seen many lose
> horizontal sync as set warms up the diode would get leaky. I think the
> diode
> was in the horizontal hold down circuit.
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
>
>
> -- Original Message -----
> From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, April 13, 2005 10:36 AM
> Subject: [TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical
> Distortion
> Top of Screen - FOLLOWUP
>
>
> > FOLLOWUP
> >
> > Okay I decided to get back to this dog today. I changed a few more
> > questionable caps to no avail. The problem may not be vertical but
> > horizontal because I do have a full vertical deflection it's just the
> > top 1" of the screen that is scrambled as if the horizontal is off but
> > just at the top. Has anyone seen this on this chassis?
> >
> > David Lessard
> > Alexandria, Ontario, Canada
> > Mr_fixit@xxxxxxxxxxxx
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> > Sent: Friday, April 08, 2005 7:23 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical
> > Distortion Top of Screen
> >
> > 5" missing video on top of screen that "was" pulsating up and down is
> > gone; C559 220/35 reading 42 was the bad guy. I still have an inch or
> so
> > of vertical distortion (pulling to the left) at the top of the screen.
> > Also 1/3 of the screen seems to be brighter (flickering also) then the
> > rest of the screen which has a stable image. Now to find the bad cap,
> > changed seven now and I still haven't found it. Any ideas?
> >
> > David Lessard
> > Mr_fixit@xxxxxxxxxxxx
> > Alexandria, Ontario, Canada
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> > Sent: Friday, April 08, 2005 4:56 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical
> > Distortion Top of Screen
> >
> > Oops...wrong model...should be YAMED204C. What is the chassis number
> for
> > this? Anyone?
> >
> > David Lessard
> > Mr_fixit@xxxxxxxxxxxx
> > Alexandria, Ontario, Canada
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> > Sent: Friday, April 08, 2005 4:29 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Quasar 27" TV - YAMRD204C - Vertical Distortion
> > Top of Screen
> >
> > Hello Techs,
> >
> > Unit came in with vertical lines top of screen. Replaced usual
> suspects
> > around vertical deflection heatsink, C451, C453, C455, C458 and a
> > .1uf/50V cap (forgot its board location). Anyway now I get vertical
> > distortion at the top of the screen while viewing a channel. With just
> a
> > blue screen (like from a VCR menu) I can see the top 5" of the screen
> > pulsing up and down, I rechecked all caps and verified the charge-pump
> > circuit is working properly. What am I missing here? Another cap?
> >
> > Thanks,
> >
> > David Lessard
> > Mr_fixit@xxxxxxxxxxxx
> > Alexandria, Ontario, Canada
> >
> >
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