[TechAssist] Re: Mitsubishi WS-55311 dead set code 23
- From: "John @ Myers TV" <myers_tv_b@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 23 Apr 2005 17:54:35 -0400
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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