[TechAssist] Re: KP46V25 Power Cycling on/off
- From: Cliff Afflick <sgt.cliff@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 27 Oct 2002 09:04:25 -0700
Hi Jeff
I am not the Sony expert but your problem sounds like you are having power
supply problem.
Reg is breaking down under load.
Picture information draws more current so whenever the antenna is
disconnected less current is required then at that stage it will not pulse.
I wish I could give you the fix. This is just a wild guess.
Good luck.
Cliff.
Double Zero
Electronics.
The trouble shooter.
sgt.cliff@xxxxxxx
----- Original Message -----
From: "Shoreline Electronics" <jstielau@xxxxxxxx>
To: "Tech Assist Group" <techassist@xxxxxxxxxxxxx>
Sent: Sunday, October 27, 2002 8:30 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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