[TechAssist] Re: Sony 32" TV KV32XBR45, severe lines across screen, no video

  • From: "Premium Technologies" <premtech@xxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 7 Nov 2002 00:41:01 -0800


Hi Gary,
There are also tips from Sony Videotech that describe these same symptoms
and point to replace IC301, P/N 8-752-063-50.
The CXA1477AS is available for $49.90 at:
http://www.electronicsic.com/Default.htm
Hope this helps.
Bill

Premium Technologies
27501 V Street
Ocean Park, WA. 98640
Phone: (360) 665-5984
Fax:     (815) 425-8530
email: premtech@xxxxxxxxxxxxxx
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 06, 2002 8:05 AM
Subject: [TechAssist] Sony 32" TV KV32XBR45, severe lines across screen, no
video


>
> I have here a Sony 32" TV KV32XBR45. The symptoms are:
>
> First turn it on, there are thin bright lines which go all the way
> across the screen, and also cover the whole screen from top to bottom.
> The spacing between each line is maybe 1/8 of an inch. after about 5
> seconds, the lines dim out but can still be seen. There is no video
> signal visible in the background. The background at this point is black.
> Turning the G2 screen control up causes the lines to go brighter at
> first but then they dim out to almost as dark as before G2 was adjusted.
>
> Scoping the R, G, B inputs to the CRT board shows sync but no video
> information. Scoping heater waveform shows 23 V p-p from cold to warm
> without fluctuation in amplitude. Measuring R, G, B pins on CRT I get
> approx 185V dc on each. G1 measures zero V dc
>
> I have never worked on any of these XBR sets, but through reading tips,
> I believe it could be one of 3 problems:
>
> -IK
>
> -caps bad in PIP module
>
> -bad jungle IC 301, CXA1477AS
>
>
> I have gone over soldering on main and jungle IC boards, checked caps in
> power supply and around IC 301 and changed a few marginal ones but there
> is no difference in operation. I don't know where the PIP module is so I
> haven't checked for caps there. There has to be a PIP module because it
> is a dual tuner set. I also don't have schematic to make measurements
> around the jungle IC or extension cables to make life easier to work at
> it. I don't know much about the IK or how to check it out. Most of the
> tips I read suggest the IC 301 jungle sounds like the probable suspect.
> My supplier has it on back-order until December.
>
>
> Any suggestions appreciated.
>
>
>
> --
> ******* ATTENTION, PLEASE ********
>
> I have a new email address. Please
> send all email in the future to:
>
> "Gary McCartney" <gary@xxxxxxxxxxx>
>
> Thanks.
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
>
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