[TechAssist] Re: Sony projection KP46XBR25 1k blanking
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 13 Apr 2004 20:44:10 -0400
Maybe a loose HV lead in the splitter for the Green CRT.
Try swapping the anode wires in the splitter
Also check the return IK pulse for the green CRT board.
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
jstielau@xxxxxxxx
========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd
----- Original Message -----
From: "James M. Osburn" <josbu@xxxxxxxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, April 13, 2004 6:52 PM
Subject: [TechAssist] Sony projection KP46XBR25 1k blanking
> Hi Techs,
> I am working on this set that has a wierd problem. Set comes on normally,
> has a good pix then after about 15 minutes the pix blanks out. I suspected
a
> bad tube and checked all 3 with my Sencore CR-70. None showed to have
shorts
> or weak emission.
> Next I replaced the jungle chip IC302 with original Sony part. Problem
still
> exists. Tried to isolate with freeze spray with no success.The CRT heaters
> and HV are all ok. I have not done a lot of 1k blanking troubleshooting on
> these sets so after researching it a bit I discovered that you can tell if
> the jungle IC is putting out the 3 1k pulses by looking for a bright line
at
> the top of the screen for all 3 tubes when the set is acting up. My red
and
> blue lines are there but my green is missing when the set is blanked.
Also
> another wierd thing is when the set is blanked and I try to turn up the
> green screen control the red and blue tubes get dimmer. The red and blue
> screen controls act normal. I have the service manual on CD rom (old
> version) and have the new Sony ESI for this year, unfortunately they
> neglected to tell me that they were changing to DVD format which my
computer
> doesn't support. It's always something. Can anyone help shed any light on
> this wierd problem? Any input is greatly appreciated.
> Mark Osburn
> J.M. Audio Video Repair
> 3701 Carthage Street
> Fort Smith, Arkansas
> 72903
> josbu@xxxxxxxxxxxxxxxx
>
>
>
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