[TechAssist] fix Toshiba CF27E30 (TAC9512?) snow only even after tuner rebuilt
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 08 Oct 2004 16:34:29 -0400
Thanks, Bob Waterman for the tech help.
Using the tuner voltage chart provided, I found the SCL line pin 4 on
tuner was low. (normal @ chan.2 was 4.7V, read only 2.3V)
I traced back from tuner pin 4 to find an open trace. Toshiba used white
silicon glue globs on the bottom to hold wires to the board underneath
tuner,and this pulled one trace open. Bridged it and tuner operation
returned. Finished by replacing both speakers (one open, other rasping).
The set was on a rack outside a restaurant in the waiting area and
humidity probably ruined the cones.
Phil Bader
Phil Bader wrote:
>This CF27E30 TV with only snow was possibly due to a storm. Snow only.
>OSD OK.Video input works OK. Uses a long style tuner with exposed rear
>part showing an IC and about 14 pins # EL471LW.
>Sent the original to Tip-Top Tuner (didn't have an exchange in stock).
>Came back, same issue.This tuner looks like it does it all. I am not
>sure of the pins, but some have +5V, and one has +33V.
>Wondering if I got a bad one back.
>Can someone send pdf of the tuner ckt so I can check voltages? Or serv.
>manual?
>Thanks,
>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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