[TechAssist] Re: Quasar 27" TV - YAMRD204C - Vertical Distortion Top of Screen - FOLLOWUP
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 13 Apr 2005 14:04:05 -0500
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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