[TechAssist] Re: Mitsubishi WS-55311 dead set code 23
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 23 Apr 2005 12:50:11 -0400
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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