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

Dennis,

MEK.  The I tried soap and water--no good.  Ditto for alcohol.  Oh, yes,
I used the MEK in a well-ventilated environment!

I should have stated that this is a PTK169.


Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL  32561
850-934-8324 (Voice) 850-932-0819 (Fax)

-----------------


On Sun, 30 Dec 2001 17:35:28 -0800 Dennis Viereck <wa6ati@xxxxxxxxxxxxxx>
writes:
> 
> 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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