[TechAssist] Re: Sony KV27TS27 intermittant shut down nightmare
- From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 29 Aug 2002 06:39:08 -0300
drcvr,If I'm not mistaken,I beleive Phil got the fix for this unit;bad VIF
module,solder-up job.But as for the AN5521,it is capable of handling 24vdc
and from my experence is one of the most reliable vert o/p ic's used in
various tv's.I personally have replaced very few of these.Still have old
stock from many years back.May be the supporting circuitry used in
conjunction with the AN5521 but for my.02 it's one rugged little
chip...Don....
HARTS-TVCR''ASC''
9 Robert St.,Oromocto,NewBrunswick,Can
E2V 3N2
Tel#506-357-9785,Fax#506-357-6010
hartstv@xxxxxxxxxxx
----- Original Message -----
From: "drcvr" <drvcr@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, August 27, 2002 10:39 AM
Subject: [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
> >
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