The customer said this Viewsonic PF790 monitor was flickering and
now
has only blue on the screen. The OSD (blue only) and front panel
controls
work, so I assume the EEPROM is OK. If I raise G2, I get a grey raster,
so
I know the tube is good. I found a pinout for the three channel video
preamp IC
and all three outputs are active. By deduction, I determined most of the
pinout
for the CRT driver IC, a VPS16. All three inputs are there but two of
the
outputs are missing. I therefore believe that driver chip is bad. It's a
large
15 pin SIP mounted on a heat sink. I need a source for a replacement
chip. I'm
in the USA. Thanks in advance for any help!

Ray
--
My return address is munged. To email me, use rrcc at myuw dot net

On Mon, 24 Nov 2003 00:04:02 -0800, Ray wrote:

The customer said this Viewsonic PF790 monitor was flickering and
now
has only blue on the screen. The OSD (blue only) and front panel
controls
work, so I assume the EEPROM is OK. If I raise G2, I get a grey raster,
so
I know the tube is good. I found a pinout for the three channel video
preamp IC
and all three outputs are active. By deduction, I determined most of the
pinout
for the CRT driver IC, a VPS16. All three inputs are there but two of
the
outputs are missing. I therefore believe that driver chip is bad. It's a
large
15 pin SIP mounted on a heat sink. I need a source for a replacement
chip. I'm
in the USA. Thanks in advance for any help!

Ray
--
My return address is munged. To email me, use rrcc at myuw dot net



NEI shows it at $35.99 http://www.neiparts.com/

Wayne