[TechAssist] Re: Mitsubishi VS 5006 repeat vert fail???
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 20 Sep 2001 09:06:10 -0400
Damon,
I'd try another Vert Output IC to be sure ( Different batch....no SK's!!!)
Also...my notes show the zener should be an 11V...not a 10V.
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 2:35 AM
Subject: [TechAssist] Mitsubishi VS 5006 repeat vert fail???
> Hello everybody,
>
> I have a VS 5006 that had a dead vertical Ic about 2 weeks ago. I had
replaced the LA 7838 vertical output, along with c4000 and c4006 which are
the 28 volt power supply filtering caps, the 10 volt zener diode on pin 1 of
the ic, and also had a dead SMPS output ic which isn't even associated with
the vertical circuit. When I installed the new vertical ic, it didn't even
work, fortunately I had another one, installed it and it ran fine for 2
weeks. Now I'm back on the job again with a dead vert ic and wondering if I
ran into a bad batch of LA7838's or if I'm missing something on this repair.
>
> Here's what I'm seeing: 10 volts is present on Pin 1, sync is present on
pin 2, my 28 volt supply is running at 14 volts (this uses a 28 v Ihvt
supply) and the diode and resistor on the 28 v supply measure good. Looks
like the vert output is loading down the 28v supply, but nothing is smoked.
the vert yokes each measure 2 ohms for a total of 6 ohms, so I don't think I
should be looking at that..... Any body had any problems like this? The vert
pump up diode measures ok too.
>
> Thanks to anybody who has seen this problem and can resolve this.
>
> Help make your TechAssist online repair tips
> database better! Submit your fixes here:
> http://www.circuitwork.com/techassist/tip/#tips
> To unsubscribe write to:
> techassist-request@xxxxxxxxxxxxx
> with unsubscribe in the subject line.
>
Help make your TechAssist online repair tips
database better! Submit your fixes here:
http://www.circuitwork.com/techassist/tip/#tips
To unsubscribe write to:
techassist-request@xxxxxxxxxxxxx
with unsubscribe in the subject line.
Other related posts:
