[TechAssist] Re: Mitsubishi VS4551 - Intermittant Dead?
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 20 Sep 2001 09:03:12 -0400
Damon,
This was in Winstips...
1) Power Supply Intermittent Power On
Fix : Install Pt#Kitvzpwr A. Remove Ferrite Bead (L9a30) From R9a21
Located On The Main-Pcb.
2) Power Supply Power Supply Pulsates
Fix : Power Supply Pulsates On And Off,Check Ic9a1 To Be Shorted Or Leaky.
Located On The Main-Pcb. Pt#267p062010
3) Power Supply Won'T Turn On:-Osc.
Fix : Will Not Turn On,Supply Oscillates.Check The Voltage At Pin 5 Of Ic9a0
If 0v.Replace Ic9a0 (Pt#267p112050),D9a00 (Pt#264p102020) On The Main-Pcb.
Jeff Stielau
Shoreline Electronics Repair
125 Beechtree Lane
Westbrook,CT 06498
860-399-1861 Voice
860-664-3535 Fax
jstielau@xxxxxxxx
----- Original Message -----
From: "Damon" <damon101@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 20, 2001 2:29 AM
Subject: [TechAssist] Mitsubishi VS4551 - Intermittant Dead?
> Hello everybody, and Thanks in advance to anybody who has seen these
symptoms on a Mitsubishi VS4551. My first time repairing this specific
model.
>
> Cust complained of intermittant dead set. I saw it fail once, looked like
the Tv went black, then saw 3 flat lines (R, G, B)
> and Tv always had sound and remote/front panel control. Turn it off for
20-30 minutes and it would then function fine.
>
> I replaced the vertical output , but that didn't fix the problem. After
further questions I also found out that the TV when cold would not start the
first time, but if turned off, then back on it would work, Lo and behold I
got it to show that symptom. When it does that, you hear the power relay
click, no HV or sound at all. 2nd time and it starts....
>
> I've worked on Mitsubishi's a long time , but this is my first VS 4551
with these symptoms. I'm thinking it may be an intermittant SMPS output, but
that doesn't explain the missing picture with sound symptom, only the dead
when cold symptom. I'm sure somebody has seen this, and thanks for any info
you have.
>
> Damon
>
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