[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: "Larry E" <videotech@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 15 Jul 2005 15:36:06 -0400
Bob, yes I have the set at my shop, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 15, 2005 3:24 PM
Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
> You made me think that the customer mentioned "that they had lightning
> problems 2 days before set went down". Since it ran on the variac, it
would
> be doubtful that the problem is in the power supply as they are not very
> forgiving. I am wondering if they may also have an electrical issue at
their
> home as a result. Is the set at your shop now?
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager / Parts Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxx
>
>
> ----- Original Message -----
> From: "Larry E" <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 15, 2005 3:12 PM
> Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
>
>
> Bob, don`t know, haven`t got the parts in yet, (ran out of IC601). I did
> check the customers
> ac outlet when I found out the parts were shorted again, had 124 volts, I
> guess I`m stupid for
> not thinking to plug it straight into the AC at the shop before returning
> the set, never gave it
> a thought, (won`t happen again) the fact that it shorts all 6 pins to each
> other would say a dead
> short to me but I sure as hell can`t find one, Thanks for the reply, Larry
E
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
> ----- Original Message -----
> From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 15, 2005 2:59 PM
> Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
>
>
> > Aside of plugging it into the variac at your shop, what happens when you
> > plug it directly into a normal outlet at your shop? Do it still short
the
> > regulator or does this only happen at the customer's home?
> >
> > Bob Waterman, CET® #RI-28
> > Master Technician License #9109
> > Service Manager / Parts Manager
> > Gemini Computer, TV, & Security Alarms
> > (508)695-7302
> > (508)695-7769 FAX
> > geminitv@xxxxxxxxxxx
> >
> >
> > ----- Original Message -----
> > From: "Larry E" <videotech@xxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, July 15, 2005 2:50 PM
> > Subject: [TechAssist] Sony RA-2A KP-46C65 instantly blows IC601 & R608
> >
> >
> > 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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