[TechAssist] Re: Sony KV27TS27 intermittant shut down nightmare

Hello Phil!
I am confusing about AN5521 (vertical O/P) in sony TV's . I did alot in
TOSHIBA TV's. I am confuse because I don't think AN5521 can handle -15
volts. If this is TRUE , then VERTICAL O/P ckts is simple to fix.
Dr. VCR    est:1994
20 Hanson Ave
Kitchener, Ontario
CANADA N2C 2E2
Tel 519-579-7112  Fax 519-579-1996
drvcr@xxxxxxxxxx

----- Original Message -----
From: "Phil Bader" <philbad@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 26, 2002 10:37 AM
Subject: [TechAssist] Sony KV27TS27 intermittant shut down nightmare


>
> Originally the customer said this set would have erratic vertical,got
> worse, finally just shut down.
> It was at this shut down stage when he brought it in.I noticed the vert.
> output IC501 (AN5521) had questionable solder on the pins.Resoldering
> helped. I finally replaced it with a new one.I soldered around the area
> and other parts of chassis (H. driver transformer,etc). Symptom seemed
> cleared.
> Carried it home.Hours later called back.Same thing.Back to shop. I
> removed the "E" board that had vert. centering switch and other vert.
> components, resoldered it all, cleaned switches,pots,connections,
> reseated it on main board. Resoldered all the three leg regulators I
> could find.
> (I also removed the audio board and replaced a borderline SBX1637-11 as
> afterthought).
> I use good lighting and a head band magnafier as well.
> Well, it's baack!
> Definately a bad connection issue.He said it was shutting down again. It
> runs here on my bench, but if I tap chassis I see flashing/instability.
> Sometimes looks like a AGC bend distortion.Tap again, and all clears OK.
> I am at wit's end.
> This chassis seems designed to shut down for many reasons. (originally,
> loss of vertical) now, don't know.
> Help!
> Phil Bader
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: philbad@xxxxxxxxxx
>
> ------------------------------------------
> 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: