[TechAssist] Re: Sharp 32RS400 Horzintal Freq -Hash
- From: "D Thunhurst" <dthunhurst@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 6 Jan 2003 16:22:12 -0700
Peter,
I had a 32 inch Sharp a couple months ago that was giving pie crusting when
on for a few minutes. It turned out to be the horiz. driver transistor.
It used a 2SC2482.
Hope this might help.
Daryl
Daryl's TV
3310 Dyer St.
El Paso, TX 79930
915-565-9184
915-564-1024 Fax
http://dynacomp.freeyellow.com
-----Original Message-----
From: Peter oliver <oliver_peter1@xxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Monday, January 06, 2003 1:01 PM
Subject: [TechAssist] Sharp 32RS400 Horzintal Freq -Hash
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>A schematic for Sharp 32R-S400 (Chassis 32NS350) Sams 4542 ( an OEM or
>efact would work) would be helpful. {can send another email address to
>handle large files 10mb + this hotmail account limited to ~1mb}
>Set had broken RF connector Customer indicated before rf broken had horz
>hash problem. Customer abandond TV, Shop set now so Fixed the connector
>looks like horz sink problem but also looks alot like Arcing in the focus
>block or a bad signal path adjusting the horz phase in the menu helps a
>little but top is diffent phase from the bottom (also looks like Zenith
when
>C2212 fails but worse), loosened yoke to take a look did not see or smell
>anything, looked under FBT saw nothing. Touched up any connections didn't
>help. You can see the OSD with some horzontal tearing/spikes in it but the
>main picture is out of phase in tuner or video input mode. The PIP
>connections on the main board had a filmy flux residue on them so It could
>have been reworked. Is there a PIP bypass procedure for this set?
>
>I've done more testing there is a pervasive amount of chop (somewhat
>sawtooth signal with downward spikes) on pin 2 of pip, on the jungle IC on
>the tuner data line. The cathode signals are a mess the to is essentialy
cut
>off with the rest of the signal extending downward looking more like a
>curtin fluttering. The video signals on the board look realitivly clean,
The
>swithing power supply is based on STR-F6626 which we all know and 'love'
>from JVC, Daewoo, ..... output on the secondary after the diode is a little
>noisy. It could be an internal arc in the FBT from the way it acts but that
>is difficlut to isolate since it requires full power (the fbt is a
F0035ME).
>Adjusting the Horzontal phase in the menu does a little but the to is very
>scewed and the bottom is out.
>My present suspects are Jungle IC, FBT, or a small part?
>
>Peter Oliver
>Tucson Radio TV
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