[TechAssist] Re: Mitsubishi WT42311, ch# VK20 open pico fuse F9A02
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 11 Apr 2005 12:40:12 -0400
Yes, you likely have a bad convergence output. Make sure you use a good
supplier. Have seen no other problems with these other than bad solder
joints on the outputs and bad ICs.
Mitsubishi techs have told me that some of the amps blow because they are
over driven and the convergence needs to be reset and redone from scratch.
I have not seen one that appeared to have that problem. If you find that
the convergence is at its limits on any of the adjustments you might need to
do so, but I would avoid it. Every one that we have done has been fine with
minor alignment and no repeat failures. The chips do run hot, however.
1. RESET THE CONVERGENCE EEPROM, PRESS "MENU 2259" TO ENTER THE CONVERGENCE
MENU THEN PRESS "8970" TO RESET.
Leonard G. Caillouet
Electronics World
1261 NW 76 Blvd
Gainesville, FL 32606
352-332-5608
352-332-5668 FAX
----- Original Message -----
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, April 11, 2005 10:10 AM
Subject: [TechAssist] Mitsubishi WT42311, ch# VK20 open pico fuse F9A02
This is a compact table top projection set. Cute. Chassis pulls out.
Push power, just a click.
Customer said after a storm (that took out other things in the home)
this set was dead.
On the power supply board I found one pico fuse open: F9A05, a 5 amp
fusing the negative (-) 24 volt source. This supplies negative voltage
to the two convergence IC's IC8C01 and IC8C02, both STK392-110 on
another board.
Nothing else "seems" bad except the fuse. Would you replace the two
converg. STKs as well?
(- )24VDC source runs as follows: smps transformer pin 22 to F9A05, to
diode D9A61, filtered by caps C9A72 and C9A73 both 330uF@35V, and
exiting at edge connector "KF" pin 15,16, coupling the power board to
the deflection board where the STK392-110's live. All the lo-ohm fuses
near STKs are OK, no diodes seem bad.
Phil Bader
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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