[TechAssist] Re: Mitsubishi WS-55311 dead set code 23
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 23 Apr 2005 22:34:20 -0400
I do have a jar of highly conductive silver-filled silicone lubricant. It is
a gray color. It is intended for lubricating the blades and pivots of knife
switches and other types of sliding electrical contacts. Its just too
dangerous to use on semiconductor heat sinks but I guess somebody might try.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "John @ Myers TV" <myers_tv_b@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, April 23, 2005 5:54 PM
Subject: [TechAssist] Re: Mitsubishi WS-55311 dead set code 23
> 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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