[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: "Larry E" <videotech@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 15 Jul 2005 17:24:45 -0400
Phil, no vdr`s in this chassis, I`m looking at the isolation issue only
because I find no
parts in the primary circuit that are bad, (or the secondary for that
matter) yet it runs
if I power it from the variac? I`ve ordered new IC`s and resistors, I`ll try
operating
it from the variac when I get the parts in and if it runs off the variac
I`ll try
running it directly from the shop wall outlet, if it runs from my AC outlet
then
Bob Waterman may be right there may be an issue with the customers AC as he
said he had a violent strike of lightning 2 days before the set went out,
you know
the drill down here, sprinkler system, garage door openers, etc. etc. His
outlet
read 124 volts though when I was there, we`ll see when the parts come in,
Thanks for the reply, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 15, 2005 5:01 PM
Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
> You are assuming this is an isolation breakdown issue. Maybe not. Does
> this chassis use VDRs around the MXO841? These VDRs do go bad.
> Just a thought. I'll polk around when I'm not fixing table radios.
> Phil
> Phil
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
> personal/ alt. email: pbader@xxxxxxxxxxxxxxx
> see our ad at:
>
http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.c
om/
>
>
>
> Larry E wrote:
>
> >Hi Guys, My week for headache sets, this Sony RA-2A covers the following
models
> >KP41T65, 46C65, 48S65, 53S65, & 61S65, went to customers house and all
pins
> >of IC601 (MX0841AB-F) were shorted to each other, also R608 the .1 1/2w
> >fusible resistor was open, pulled all of the little blue caps around
IC601 and checked
> >them on the sencore, all ok. I ordered a new IC & resistor, installed
them and when
> >I powered up the set they instantly blew, pulled set to shop,
re-installed new chip
> >& resistor, plugged into variac & brought up slowly, set started and
worked fine, heres
> >the fun part, I brought the set back to the customer hooked it up and all
I get is a
> >constant blink of the led, of course IC601 & R608 were blown again,
Obviously my
> >Sencore variac being an isolation transformer let the set run but
connectiong to the
> >customers AC outlet lets the parts short, I have pulled every cap in the
"hot" side
> >of this power supply and found no shorted caps, checked the 2.2 meg
resistor
> >R601, there is no continuity between hot & cold ground, customer told me
second
> >time out that they had lightning problems 2 days before set went down but
I see
> >no arcs etc on board, main fuse was not blown, HOT circuit good, seems to
me it
> >has to be hot & cold ground connected somewhere???
> >please help if you can, I`m pulling hair out at this point, Larry E
> >Larry Eastman
> >American TV & Electronics
> >Crystal River, Fl. 34428
>
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