[TechAssist] Re: Hitachi 46UX13K very intermittent
- From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 29 May 2002 11:25:50 -0400
Walter,
I had one that drove me nuts until I checked ALL of the electrolytics in the
power supply. Found a couple of high ESR caps that solved the problem.
Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: "walter wood" <wwood_38478@xxxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, May 29, 2002 11:10 AM
Subject: [TechAssist] Hitachi 46UX13K very intermittent
>
>
>
> > The customer has brought this set in 5 times for
> > a
> > "dead set" condition.
> > The first 4 times I played it for weeks and found
> > no problem other than a slight short vertical at
> > the top, which corrected itself quickly.
> > A few weeks ago he said that the set was not
> > working again, and would I come and check it
> > there.
> > I agreed, and found that it had sound but no
> > picture and apparently no high voltage.
> > Using the old NE2 neon bulb trick, I could detect
> > High voltage around Q777, but not around the
> > flyback.
> > No ammount of beating, twisting, or pushing would
> > restore operation however.
> > The set is now back in the shop and It WORKS.
> > No, there is nothing wrong with the customers
> > voltage, checked that while the set wasn't
> > playing.
> > I have pulled the sweep/power supply/convergence
> > board out anyway, expecting to at least find some
> > bad solder.
> > The only bad solder I can see, even with high
> > magnification, is on pins 11 and 12 of the blue
> > convergence amp. yet, the convergence is ok.
> > Quite frankly I don't have a clue about what to
> > do
> > to make this set play reliably, other than to
> > resolder the ihvt, etc.
> > I don't think the driver transformer is at fault
> > as
> > hv was detected at the hor. output transistor.
> > Would the slight, temporary, vertical short scan
> > be
> > a factor???
> > Convergence IC???
> > Does anyone have any suggestions??????
> > Thanks
> >
>
>
> =====
> Walter Wood
> Future Tech Home Center
> 2786 Hwy. 43 N.
> Lawrenceburg Tn. 38464
> 931-829-3337
> Fax 931-829-4044
> mailto:wwood_38478@xxxxxxxxx
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! - Official partner of 2002 FIFA World Cup
> http://fifaworldcup.yahoo.com
> ------------------------------------------
> To REMOVE your email address, click here:
> http://www.tech-assist.org/unsubb.html
> To CHANGE your email address, click here:
> http://www.tech-assist.org/change.html
> ------------------------------------------
> ***NEW*** Tips Added Instantly!!!***
> Submit Repair Tips here:
> http://www.tech-assist.org/secure/tip/
------------------------------------------
To REMOVE your email address, click here:
http://www.tech-assist.org/unsubb.html
To CHANGE your email address, click here:
http://www.tech-assist.org/change.html
------------------------------------------
***NEW*** Tips Added Instantly!!!***
Submit Repair Tips here:
http://www.tech-assist.org/secure/tip/
Other related posts:
