[TechAssist] Hitachi 46UX13K very intermittent
- From: walter wood <wwood_38478@xxxxxxxxx>
- To: Tech Assist <techassist@xxxxxxxxxxxxx>
- Date: Wed, 29 May 2002 08:10:16 -0700 (PDT)
> 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/
Other related posts: