[TechAssist] Re: Zenith B25
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 20 Sep 2001 02:36:57 -0500
Man I don't want to scare you, but that symptom reminds me of a shorted crt.
You may want to monitor the b+ and see if you can use that as a reference to
watch during failure. If so, you can pull the crt board and see if your B+
returns to normal with the crt unplugged and goes bad with the crt
connected. ALSO NOTE: we have seen cathode to heater shorts on some zenith
crts which will exhibit white screen with retrace lines, shrinking vert/horz
deflection and sometimes some smps squeal (slight). If this is the case you
can purchase a heater isolater, cut the heater connects and install the
isolator.
----- Original Message -----
From: "Mark Simpson" <res050hb@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, September 19, 2001 10:59 AM
Subject: [TechAssist] Zenith B25
> chassis 9-2143.pix drops down with retrace and pulls in on sides.gets
worse if screen is turned up.tapping or violent shaking or freeze does not
affect.swapped out yoke and fly with known good,str53041,numerous caps
> very intermittent,sometimes shutsdown.please any tips on this chassis even
if seemingly unrelated to this problem.set came in for surge then
dead,replaced B+ fuse and it played for a week with no problems.
>
> Mark Simpson
> Mark Electronics
> Plant City,FL
> (813)717-9700
>
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