[TechAssist] Re: RCA ITC 008 fam shorts 27v zener again.
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 24 Mar 2005 19:20:49 -0500
Here is an excerpt from a previous post:
Chassis: ITC008
Symptom: Dead
Found: DP027 244838 27v zener shorted.
DP025 shorted, in parallel with DP026. pn 244870
Cause: Capacitor CP064 201162 1000uf 25v hi temp bad.
The gory details.
Found DP027 and DP025 shorted. Based on CTC203 experience I replaced
all of the active components in the primary, ip50 and IP001 and tp052 in
the feedback line.
At plug in I heard the switch mode supply come up, about 130v, but the
supply was making a slight squealing sound, then the B+ jumped over
200v, DP027 shorted.
In standby the set monitors the 13V supply for regulation, CP064 is the
13V supply pump-up cap.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxx
----- Original Message -----
From: "larry" <schntv@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 24, 2005 4:04 PM
Subject: [TechAssist] RCA ITC 008 fam shorts 27v zener again.
> the SMP may have had a power surge, the 27v zener DPO27 and
> the SMP drive transistor TPO25 were shorted.
> cant find anything else shorted,
> when zener is replaced it shorts a mediately.
> RP006 and 007 check right on value.
> Is this a special zener, What am i missing??
> Thank you,
> Larry
>
>
> --
> Schneider TV & Electronic Inc.
> 5415 N. Wooster ave.
> Dover, Ohio 44622 www.geocities.com/schntv2000/
> 330-343-0768 FCC. first class & Extra class K8WLY
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