[TechAssist] [Fwd: Re:fix. Zenith SS2509H 9-914-2 main dead,still no chirp]
- From: Phil Bader <philbad@xxxxxxxxxx>
- To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
- Date: Sat, 13 Oct 2001 16:39:29 -0400
-------- Original Message --------
Subject: Re:fix. Zenith SS2509H 9-914-2 main dead,still no chirp
Date: Sat, 13 Oct 2001 16:38:59 -0400
From: Phil Bader <philbad@xxxxxxxxxx>
Organization: Jan Phyl TV Inc. Winter Haven, Fl. Estab. 1976
To: Topics of interest to consumer electronics repair professionals
<CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
References: <3BC89B85.7D437AEA@xxxxxxxxxx>
The final fix was power supply diode CR3432 ( 344-00 on part) was
shorted.Don't know actual equivalent number,as there were many of the
same on another salvage board. I'll note for future reference this diode
will not cause a short condition,but shuts down the SMPS and no chirp
when plugged in. Easy to overlook with all the low ohm resistors near
by.Thought I was reading across one when I measured that very diode
earlier.
Phil Bader wrote:
>
> I went thru the SMPS as usual replacing Q3431 (121-1244), the two caps
> C3434 (22mfd/63V),C3432 (100/25V),opto IC ICX6300 (162-18-0),. Also
> C2604 (22/100V),C6054 (47/25V) as these were leaking fluid also, reg ic
> STR53041 changed. Checked all lo-ohm resistors in SMPS. I still don't
> get the characteristic "chirp" of the SMPS when plugged in.Nothing,of
> course past the SMPS transformer, because it's still not oscillating. I
> am stumped.Help needed!-Phil
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