[TechAssist] Re: Sony KV27FS12 - shuts down
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 13 May 2005 09:33:13 -0400
SYMPTOMS
Unit has what looks like severe pincushion problem with horizontal
compression on left
side of screen.
Pin amp adjustments have very little effect.
CAUSE
Unit has what looks like severe pincushion problem with horizontal
compression on left side of screen. Pin amp adjustments have very little
effect. e parabola signal normal at pin 2 of IC501 and varies in amplitude
with adjustment normally. R513 or R551 will overheat depending on position
of horizontal centering switches. Found both L503 and L504 shorted. part
number 140667711 for both. replacing these restored normal operation. found
several cases of this problem and it may well affect other BA-5 and
possibly BA-4 chassis with this circuitry.
RESOLUTION
Parabola signal normal at IC501/pin 2 and varies in amplitude with
adjustment normally.
R513 or R551 will overheat depending on position of horizontal centering
switches.
Found both L503 and L506 shorted. Replacing these restored normal
operation.
Found several cases of this problem and it may well affect other BA-5 and
possibly
BA-4 chassis with this circuitry.
The nominal resistance of the good 10 mh coil is about 15.3 ohms on the
Fluke 83.
The bad ones read between1.5 and 1.9 ohms with the Fluke 83 meter.
SYMPTOMS
D504 keeps shorting out.
RESOLUTION
Found the EW pulse from CN2006/pin 5 was not getting to the pin drive. This
pulse is supplied to Q501(base) Pin drive. If this pulse disappears D504 can
short out.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxx
----- Original Message -----
From: "KENNETH BARNES" <KENNYB928@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 13, 2005 9:20 AM
Subject: [TechAssist] Re: Sony KV27FS12 - shuts down
> Larry: I checked these out and this is not the problem - still haven't
located the problem. Any other suggestions would be welcome. Thanks,
Kenny
> ----- Original Message -----
> From: KENNETH BARNES<mailto:KENNYB928@xxxxxxx>
> To: techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, May 11, 2005 3:03 PM
> Subject: [TechAssist] Re: Sony KV27FS12 - shuts down
>
> Larry: Thanks for the info - I will check things out. The chassis is
BA5. Kenny
> ----- Original Message -----
> From: Larry
E<mailto:videotech@xxxxxxxxxxxx<mailto:videotech@xxxxxxxxxxxx>>
> To:
techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@f
reelists.org<mailto:techassist@xxxxxxxxxxxxx>>
> Sent: Wednesday, May 11, 2005 12:41 PM
> Subject: [TechAssist] Re: Sony KV27FS12 - shuts down
>
> Kenny, chassis # AA-2 ? If so, check L511, D502, 503, 504, C511, C513
and
> check Q512 one of them or a combination of them are shorted, If you
include
> the chassis number you`ll get more responses as many models are
covered
> under
> certain chassis numbers, Good Luck, Larry E
>
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
> ----- Original Message -----
> From: "KENNETH BARNES"
<KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:
KENNYB928@xxxxxxx>>>
> To:
<techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@
freelists.org<mailto:techassist@xxxxxxxxxxxxx>>>
> Sent: Tuesday, May 10, 2005 10:56 PM
> Subject: [TechAssist] Re: Sony KV27FS12 - shuts down
>
>
> > Damon: I replaced IC301 - have pix and all functions. Now I have
way
> too much width. Called up service adjustment mode. Secured HSIZ
(Horz
> size); cannot adj. Can't see all the service writing. Missing the s
on
> service writing. Checked Q503 & Q504 in the pincushion circuit. They
are
> O.K. Also picture bowed in the middle even though I have a full pix.
Any
> suggestions? Thanks for your input. Kenny
> >
> > ----- Original Message -----
> > From:
Damon<mailto:damon101@xxxxxxxxxxxxxx<mailto:damon101@xxxxxxxxxxxxxx<mailto:d
amon101@xxxxxxxxxxxxxx<mailto:damon101@xxxxxxxxxxxxxx>>>
> > To:
techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@f
reelists.org<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx
<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:tech
assist@xxxxxxxxxxxxx>>>
> > Sent: Monday, May 09, 2005 7:17 AM
> > Subject: [TechAssist] Re: Sony KV27FS12 - shuts down
> >
> >
> > You missed the vertical circuit completely. Most of the time the
> vertical
> > drive signal dies and you have to replace the jungle, other times
it's
> the
> > V+ and V- supplies that come from the IHVT.
> >
> > Damon Brunger
> > Telrad Electronics
> > Fort Wayne IN
> > ----- Original Message -----
> > From: "KENNETH BARNES"
<KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:
KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:K
ENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx>>>>
> > To: "techassist"
>
<techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@
freelists.org<mailto:techassist@xxxxxxxxxxxxx<mailto:techassist@xxxxxxxxxxxx
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hassist@xxxxxxxxxxxxx>>>>
> > Sent: Sunday, May 08, 2005 10:11 PM
> > Subject: [TechAssist] Re: Sony KV27FS12 - shuts down
> >
> >
> > > Sony KV27FS12 - still have a problem. 4 blinks. Set came into
shop
> dead.
> > Replaced HOT. It then blew two HOT. Changed flyback (bad) and
> installed
> > new flyback, another HOT and changed vert IC502. Hi voltage is
normal.
> B+
> > on HOT is 134V. All voltages on IC502 are normal. When you plug
TV
> into AC
> > it comes on for 6 - 8 seconds then shuts down - cannot turn off TV
with
> > power button. Once it shuts down, you can make it come on by
pushing
> power
> > button, then it shuts down in 6 to 8 seconds. By turning on
enough
> times,
> > you get a horz line in pix, slightly above center of pix.
> > > Also D501 and D504 are ok. D620 & D616 are OK. Ring yoke
is ok.
> > Changed IC702. 200V source is normal.
> > > What have I missed? Appreciate any help with this one.
> > > Kenny Barnes TV
> > > 928 S. Marshall St.
> > > Boone IA 50036
> > > Ph. 515 432 5250
> > > Email:
>
KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:KENNYB928@xxxxxxx<mailto:K
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>
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> >
>
>
>
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