[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 15 Jul 2005 20:14:54 -0400
124 volts is suspiciously high, even for Florida. If he has lost the neutral
the voltage will go up and down as various loads around the house change.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "Larry E" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 15, 2005 5:24 PM
Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
> 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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