[TechAssist] Re: Sony KV27FS13 Shutdown ! Schematic Needed!
- From: "D PANDAY" <dpanday@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 07 Oct 2002 22:38:09 -0400
Jeff,
This is what I have on KV27FS13.
1. Symptom:
Dead / Standby light flashes 4x, 135v line pulses between 0v - 30v several
times, then unit shuts down. Power on to recycle.
Solution:
D501 is leaky. Measures 80 ohms in both directions.
Part's ...
D501 Diode -- 871994580 -- ERC06-15S
2. Symptom:
Immediate shutdown at power up, 4 blinks of LED
Solution:
Found a transistor in place of D616 that was open, replaced w/correct diode
and unit powered up and
operated normally. The transistor that was in place of D616 was a 2SC4370
and did have original
solder indicating this came from factory this way. Transistor checked open.
Replaced D616 w/originally listed part number (871951037) and unit operated
normally. Located off of T603/pin 14 of the power supply.
Technical Description:
Disconnected 200v line to CRT board and still shuts down. Horizontal Output
checks good, 135v good, IC-502/pin 2
0v. Unsoldered IC502 and still shutdown and no +/- 13v, no HV rush at power
up, no HD/VD drive at first power up.
Low B from D616 does not come up at all.
If you need more info, let me know.I can send you cct operation/ trouble
shooting tips.
Hope it helps'.
Panday
>From: "Larry E." <videotech@xxxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Re: Sony KV27FS13 Shutdown ! Schematic Needed!
>Date: Mon, 07 Oct 2002 22:15:46 -0400
>
>
>Jeff, don`t have anything specific on that set but I believe you can
>pull up the fault codes on that set and see what the set has entered.
>This is NOT the same as the service mode so be sure to push "vol minus"
>in the sequence, Display,Channel,5,Volume Minus,then Power. The screen
>will now show all fault codes this set has encountered and the number of
>times they have occured. This might help you figure which circuit is
>causing you all this grief, hth, Larry E.
>
>Larry Eastman
>American TV & Electronics
>Crystal River, Fl.
>
>Shoreline Electronics wrote:
>
> >
> > Make : Sony
> > Model : KV27FS13 New ...right out of the box ( 27" WEGA/VEGA)
> > Problem : Shutting down on startup. LED code blinks 2 times.
> >
> > Scoping the Horiz Output collectors waveform , we saw excessive ringing
>&
> > static between H pulses. Figured the flyback was the issue. Changed
> > it.....no help.
> >
> > A little more digging revealed D504 shorted ( ERC06-15) ....this is
> > paralleled across an identical diode D501.
> >
> > Replaced the diode ( From a scrap set).....set fired up HV
>great......then
> > shutdown a few seconds later. Now 4 blinks! ( Vert failure)
> >
> > Scoping the yoke pins...showed very little/weak drive. Changed the
>TDA8172
> > ...used the STV sub for that.
> >
> > Still no fix....cycled the set a dozen or so times while checking
>waveforms
> > the D504 shorted again !! UHG !
> >
> > Odd for this set to be like this right out of the box. This set was
> > bought at a local casino with comp points....customer doesn't want to go
> > thru the warranty routes...he's willing to pay us to do it.
> >
> > Is there any Sony bulletins on this model OR a PDF file someone could
>send
> > us for this newer set?
> >
> >
> > Jeff Stielau
> > Shoreline Electronics Repair
> > 125 Beech Tree Lane
> > Westbrook, CT 06498
> > 860-399-1861
> > 860-664-3535 (fax)
> > jstielau@xxxxxxxx
> >
> >
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>
>
>--
>Larry Eastman
>American TV & Electronics
>Crystal River, Fl.
>http://www.tvjunkyard.com
>
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Panday
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