[TechAssist] Mitsubishi WS-55311 dead set code 23 FIXED!
- From: "John @ Myers TV" <myers_tv_b@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 27 Apr 2005 13:50:37 -0400
Hi Ken,
I agree. I know Heat sink compound is not conductive. But, I'm at a loss
to explain where this reading came from. I should still have the chips &
compound wadded up in a paper towel in tool bag. I'm going to
investigate further when I get to the shop in the AM.
The final chapter on the set was written a couple hours ago. When I was
re-installing the board Friday, one of the contacts in the KC connector
didn't seat properly. It was sticking out of the connector just a little
bit. This contact was the "- vertical drive" line. So, it's easy to see
why the set didn't start. No vertical drive.
It took me about 5 minutes on the return trip to find it. I was hoping
it was something dumb like that. The set is now working fine, and I have
a large check in my call book.
In case anyone wants to see the manual for this set, I'm going to upload
it to the archives, and the members directory.
John Myers
Myers TV Service
376 E. State St.
Alliance, OH 44601
330-821-6545
myers_tv_b@xxxxxxxxxxxxx
www.myerstv.net
gulftech@xxxxxxxx wrote:
>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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