Dell P922 monitor

[Chuck Norisez]

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

 

[D Yuniskis]

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.

This is a common problem (with similar monitors as well).
IIRC, you can rebias this with a change to a resistor
(though that isn't the "right" solution)

 

[Ken]

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

Here is a link that has much on your problem.
http://icrontic.com/forum/showthread.php?t=19549&page=14

Somewhere in there is a fix via the resistor change. If you cannot
find it, post that fact and I will search through my notes on the
monitor fix. The Dell monitor is made by Sony if I recall correctly.

 

[[email protected]]

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

 

[George Jetson]

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.

 

[[email protected]]

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

 

[[email protected]]

Well, it puts the proper voltage on the screen grid of the CRT; I'm not
sure what's not "right" about that.

BTW, it's probably a good idea either to use high voltage resistors or
to make up the value you need out of two or three smaller (but equal
value) resistors in series; there's not much current there, but the
voltage across those resistors makes a longer arc path a good idea.

That said, this fix has restored at least three of these monitors to
useful life. I got 'em free because the brightness control didn't work
8^}.

Isaac

Yeah, sometimes you have to work with what you have available. Of
course, an adapter to allow doing the adjustment properly can be built
for about $10 (less if you have a well stocked junk drawer). And you
don't even have to open up the monitor.

PlainBill