[TechAssist] Re: RCA PTV P46151WK, Odd Problem, FIXED

  • From: Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sun, 30 Dec 2001 17:35:28 -0800


What did you use to clean the messy compound from the bumpers?
Dennis

gulftech@xxxxxxxx wrote:

> Friends,
>
> I haven't posted this as a problem before, because I couldn't identify
> the problem well enough to ask for help.  After many, many hours of work
> and two failed attempts to return the light box to the customer, the set
> is finally fixed and I hope this will help others in the future.
>
> The set came in with the complaint of instant shutdown.  The green CRT
> was arcing at the second anode.  There appeared to be a contaminant
> spilled in the area.  Cleaning and RTV appeared to repair the set.
>
> Took lightbox back to customer.  Found light horizontal lines, almost
> like retrace on all three CRT's.  Had not seen in shop.  Also, appeared
> to have a slight sync problem.  For example, bring up convergence
> crosshatch, vertical lines had slight "s" shape in middle.
>
> After many hours of troubleshooting and failed attempts, tried PIP pix.
> PIP image was totally out of sync, like is typical of Mitsubishi.  Pulled
> the PIP module.  It had three rubber bumpers to isolate the pcb from the
> shield.  These bumpers had melted like Hershey's Kisses.  What a mess!
> Also found seven bad caps.  For the record:  C424, C425, C426, C501 (all
> 15ufd, 50V), C318/.47@50, C518/10@50, and C121/25@100.  Most of these
> caps check good with a normal cap meter, but high ESR.
>
> Set works fine now.
>
> Ken Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL  32561
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
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