[TechAssist] Re: Mitsubishi WS-55311 dead set code 23
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 25 Apr 2005 08:01:25 -0500
John,
Heat sink compound is NOT conductive; however, it could have been
contaminated by a substance that is conductive.
Another possibility is that the STK's shorted to the back. No, I see you
had the heat sinks removed by then.
Put a glob of compound on a conductive surface and put your meter probes
to each side. It will show infinite resistance, unless you are using
Eugene's chicken manure for compound. :-)
Regards,
Ken
Kenneth Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
On Sat, 23 Apr 2005 17:54:35 -0400 "John @ Myers TV"
<myers_tv_b@xxxxxxxxxxxxx> writes:
> Hi Jeff,
>
> Yes, exactly. I believe the grease was conductive. I measured less
> that
> 10 Ohms to ground on the -24V line I assumed that we needed to
> replace
> the Convergence IC's.
> After unhooking the the cables to that board, and removing the hold
> down
> screws, I checked again, and got a reading of 150 Ohms. At this
> point,
> the heat sinks had been removed from the board. I then double
> checked
> all my readings on both boards. I was getting a low resistance
> reading
> from the -24V line to ground. This reading disappeared after I wiped
> the
> heat sink compound from the board. I felt it was prudent at that
> point
> to replace the IC's anyway.
> Good point about the vertical system failure. Although there's a
> separate code for Vertical failures, it bears checking. On the V20
> chassis, the +24V line feeds the Vertical section. Fuses are god on
> both
> + & - supplies.
> I'm planning a return trip on Wednesday, armed with the scope. I'll
> be
> prepared to pull the guts, if I can't track it down on site.
>
> John Myers
> Myers TV Service
> Alliance, OH
>
> Jeff Farnsworth wrote:
>
> >Are you saying that the heat sink compound shoted the convergence
> IC's? And
> >that is why you replaced them? Check for an open pico fuse
> supplying the +
> >and -24v that in some of these also supply the vertical op IC. If
> these are
> >anything like the sonys you get a deflection failure error code
> because the
> >set is shutting off before it gets to the horizontal section
> because the
> >vertical is not firing up.
> >
> >TV Doctor
> >Avalon, Wi
> >
> >----- Original Message -----
> >From: "John @ Myers TV" <myers_tv_b@xxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Saturday, April 23, 2005 11:26 AM
> >Subject: [TechAssist] Mitsubishi WS-55311 dead set code 23
> >
> >
> >
> >
> >>Hi,
> >>
> >>Sorry for the length of this.
> >>Here's what I have. This is a service call job on a WS-55311
> (Chassis
> >>#V20C).
> >>It was throwing an error code 22 (Short protect). I measured a
> dead
> >>short on the -24V line, which feeds the convergence output.
> >>When I removed the Heat sink from the convergence outputs, I found
> that
> >>too much heat sink compound had been applied to the chips, and had
> >>seeped down onto the board. This was the cause of my short.
> >>I replaced the convergence IC's, and now I'm getting a code 23
> >>(Horizontal Deflection Failure). The 110V supply is OK. I assume
> that I
> >>have deflection, since I'm reading HV drive to the power board.
> >>
> >>I double checked that I had replugged everything.
> >>
> >>Has anyone had any code 23 problems with these?
> >>Any ideas will be appreciated.
> >>
> >>Thanks,
> >>
> >>John Myers
> >>Myers TV Service
> >>Alliance, OH
> >>myers_tv_b@xxxxxxxxxxxxx
> >>www.myerstv.net
> >>
>
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