[TechAssist] Re: KP46V25 Power Cycling on/off
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 28 Oct 2002 06:42:38 -0500
Well the CXA1477as failure seems to have fixed the stretched vertical
problem and that is a known symptom/failure.
Relay clicking on/off .... >>>MIGHT<<< be due to the other common failure
that I've consistantly seen (and hard to verify with a scope). The
convergence amps STK 392-010 (or STK 392-110) have been known to cause
shutdown. Could try freeze spray. I've seen the red amp short 99% of the
time so I'd try that first. I don't think removing the convergence yoke
connections will help identify the cause, I think it will still shutdown
with those disconnected. I've had both problems occur separately, and in
conjunction with each other.
I think the amps "flatline" and can blow the - 16v Supply fuse, so you may
want to check the 3.15 amp fuses and see if one looks stressed.
HTH
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Shoreline Electronics" <jstielau@xxxxxxxx>
To: "Tech Assist Group" <techassist@xxxxxxxxxxxxx>
Sent: Sunday, October 27, 2002 10:30 AM
Subject: [TechAssist] KP46V25 Power Cycling on/off
>
> Make : Sony
> Model : KP46V25 (Sim to KP53V25 & KP61V25)
> Problem : Initial problem was distorted image containing pulsing vertical
> height & widely spaced scan lines.
>
> Typical CXA1477AS jungle IC failure. We changed the IC with an original
> Sony 8-752-063-50 part at the customer house.
>
> Set came up beautiful! Perfect image. Ran the set for about 10 minutes.
> Buttoned up the cabinet & was doing the final channel programming & video
> adjustments and then the set turned off & the power started cycling on &
> off.
>
> Well.....we open it back up & then inspected all the board & connectors
for
> anything we may have over looked. No problems found.
>
> Changed the CXA1477AS Jungle chip again......no fix. Still Pulsing On &
Off
>
> When then discovered that if the Antenna is not hooked up , the set WILL
> start up. Timer light blinks for a few seconds as normal then stops. HV
> good, Filaments good ,Typical no signal static form the speakers.
>
> The CRT's light up for a couple seconds with no snow , just a dim blank
glow
> then they shut off. Timer light on the front stays off after the CRT's
shut
> down.
>
> If I reconnect the antenna wire at the point , the set will start cycling
of
> & off again.
>
> Broke out the fluke & checked all the B+ voltages that were labeled on the
> connectors on the Jungle ( M) board & sweep boards.
>
> What is going on with this beast!! Set was working great with no sign of
> any issues to come!!
>
> Any thoughts from the Sony Experts!!!! Help!
>
>
> 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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