[TechAssist] Re: fix Signature2000 (Zenith) 12690 dead,front LED erratically flickers
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 05 Jun 2004 12:42:24 -0700
If a 100uF cap measures above 3 ohms ESR, then it cannot function
properly at the high frequencies that the SMPS requires. The higher the
cap value the lower the ESR is needed for the cap to be good.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Phil Bader
Sent: Tuesday, June 01, 2004 1:27 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] fix Signature2000 (Zenith) 12690 dead, front LED
erratically flickers
Inside this Wards Signature 2000 was another model/service number:
PLF2027H12.
I searched this in my TECH-CD program and saw "dead: replace C3407
(100mfd@50V in power supply"
I did. Nothing. After more time, I went back to C3407 again. Some how a
10mfd got in my 100mfd bin. carelessly put it in. After I swapped it
with an actual 100mfd, it powered up and ran OK. I esr's the bad cap,
reads 7.9ohms, cap meter showed about 90mfd.
This would not seem bad enough to stop the smps, but it was.
Tech-Repair CD rules.
;-)
Phil Bader
Phil Bader wrote:
>The only response is plug it in, and the green front LED erratically
>flickers. HOT good, nothing obvious. ESRd two smps caps, seems OK.
This
>zenith 20" used two modules:
>9-873 sweep/smps
>9-871 main "signal"
>Phil Bader
>
>
>
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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