On Thu, 15 Sep 2005 22:28:48 GMT, (Carl Jenkins)
wrote:


Hello,

I'm afraid I'm experiencing a bit of a problem with
the red gun or it's circuitry in my VGA monitor. Any
solid red colour has turned to very dark red (almost
black) and there is a slight cyan wash on the screen.
The monitor is a Panasonic PanaSync E70i (model numb.
TX-T7F22M).
My local library has not purchased the SAMs schematics
since they thought the monitor schematics collection
was too expensive. I'm a computer technician but I've
repaired lots of TV recievers and a few monitors in
the past and have some repair equipment. I can't seem
to find any web sites that have free downloads of
schematics (only DVD collections for sale). Has anyone
ever had this problem with this model monitor or
equivalent and could advise me of what to do to get
the red gun to show up again? Or does anyone know of
any sites that have monitor schematics for free download?

Well, any assistance/suggestions are appreciated.


TIA,

Carl



First, measure the cathode voltages. One should be a lot higher than
the others. If they are all about the same, the CRT is weak. I've
seen a lot of bad video output ICs in monitors. Bad soldering on the
CRT board is also common with some monitors. The good news is that
the entire video circuit is normally on the CRT board, so it's easy to
get to and trace.
Andy Cuffe

-- Use this address until 12/31/2005

-- Use this address after 12/31/2005