On Fri, 11 Sep 2009 03:39:04 -0400, "George Jetson"
wrote:
wrote in message
.. .
On Thu, 10 Sep 2009 03:50:15 GMT, Chuck Norisez
wrote:
My Dell P922 monitor is too bright. Even at minimum brightness setting, it
still shows retrace lines. Otherwise works fine. Anyone know of a source
of
technicial info on this monitor? I think its made by Sony.
Thanks, Chuck
Yes, it's a Sony monitor. The screen adjustment is done via software.
This thread covers the options.
http://www.badcaps.net/forum/showthread.php?t=6770
PlainBill
I found these notes from some old posts, don't know who wrote them but they
worked for me:
having repaired over 500 Dell P1110
Most of the problems I have seen are for Excessively bright picture.
R459 is the best to Mod and Have found that 5.6M ohms to 7.5M ohms to be the
repair range depending on how bright the picture has become. The lower the
Value of R459 the darker the picture will become. I have noticed that when a
lower value is needed often the bightness adjustment will also shift the
picture color. Darker settings will shift to blue and brighter settings will
shift to red. I have not found a way to compensate or repair this problem.
also:
This is a common problem with these monitors and there are many posts about
it in this forum. The best solution is to change a resistor - R459 on the
tube base board to a lower value. It should be 10meg ohms but changing it to
a 6.8M ohm should bring the brightness level back to a normal level. Doing
the colour restore after changing the resistor should bring it back unless
the CRT is faulty.
There are three problems with this approach, and one advantage.
First of all, changing resistors because you can't do the
adjustment is a kludge.
Second, it gives only an approximate setting.
Third, the CRT characteristics will continue to change, and you will
once again have to change the resistor.
The advantage - it's easier (and cheaper) than building a rs232 to ttl
adapter. Of course, a 74C914 IC will do an excellent job and costs
about $5.00 (including shipping) from DigiKey.
PlainBill