[TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical Distortion Top of Screen - FOLLOWUP
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 14 Apr 2005 09:32:59 -0400
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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