[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 15:50:27 -0400
Leonard,
Yep, first thing I checked was for fluid. I also checked the fuses, and
confirmed operation of the + & - 24V supplies.
So you're saying that the heat sink compound is not conductive?
John
Myers TV
Leonard Caillouet wrote:
>Did you replace the open pico fuse on the -24v line? It will typically open
>with a bad output IC.
>
>The silicon that oozes out of the heat sink compound does not cause shorts,
>just a mess. A 55311 should be guttered from the factory so it should not
>have coolant on the board.
>
>Leonard Caillouet
>Electronics World
>1261 NW 76 Blvd
>Gainesville, FL 32606
>352-332-5608
>FAX 352-332-5668
>
>----- Original Message -----
>From: "John @ Myers TV" <myers_tv_b@xxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Saturday, April 23, 2005 12:26 PM
>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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