[TechAssist] Re: Sony KV27TS27 intermittant shut down nightmare
- From: Gary McCartney <number63@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 26 Aug 2002 11:02:20 -0400
Check for hairline crack where circuit boards traces meet HOT solder
pads.
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: number63 (at) inetsonic.com
Phil Bader wrote:
>
> 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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