[TechAssist] Re: Mitsubishi WT42311, ch# VK20 open pico fuse F9A02
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 11 Apr 2005 13:55:01 -0400
Understood. But, I don't want to do the reset of the converg. eeprom as
you described in procedure #1. if it comes up almost perfect without,
right? That's the last resort?
Phil
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
Leonard Caillouet wrote:
>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
>
>
>
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