Hard to believe that the P1110 and others do not support Dynanmic Covergence. When only using static convergence my P991 seemed impossible to converge acceptably (and I'm talking BIG errors on the edges). From what I understand, dynamic convergence is like having convergence magnets that change strength and/or position depending on where the raster is scanning, done via coils simmiliar to the way the dynamic deflection geometry is implemented. I know that on some monitors convergence ( which I assume is static?) is done via varistors on the yoke of the CRT, I guess more curved and smaller monitors can do without dynamic convergence? How could sony converge all these large, flat CRTs without dynamic convergence? There's got to be some way they did it in the factory.

Anyhow, RAYMAN has sent me memos from sony detailing the oficial fix and diagnosis for the over-brightness problem and the power-on screen zooming. Here they are:

CONFIDENTIAL

Last Update
3/6/2002 Event ID
E14653134 Model
CPDG500
Subject
Countermeasure to prevent background brightness intensifying
with
time

SYMPTOMS

The background brightness may intensify with the passage of
time,
not allowing the brightness control and color return function to make
adjustment.

RESOLUTION

The following measures for the applicable series of models that
are returned for repair.
1. ReplaceIC001 on the N board with the microcomputer
(CXD8744Q-0032 P/N 6-801-416-01) for which measures have been
taken.
2. Change the register set value.
1. When the power is turned on without changing the set value,
images will appear with abnormally high screen brightness.

2. Change the register value shown below and conduct service
save.
OSD_ENILARGE_LINES = 128
V_BLK_WIDTH_MIN_FV = 90
V_BLK_WIDTH_MAX_FV = 10
Please use the latest software to change the monitor register
data.
WinDAS :1.420.117
DAS :DASJB1.0.8
3. White balance control:
The control method is the same as that for sets in which
conventional microcomputers are mounted. It will take several seconds
longer for detection of the standard state of color return, but the
process and control commands is the same.
4. Control of deflecting system (screen distortion)
Control of the deflection system is necessary after replacement
of microcomputers.


MORE INFORMATION
o

Unit/Model Details
o

Links

Unit/Model Detail
Unit(s): SN Start SN End Factory Family Name Product
Category
CPDG500 2,700,001 2,707,200 INY G1 C/P




CONFIDENTIAL

Last Update
3/6/2002 Event ID
E14757495 Model
CPDG500, GDM5402, GDMF500R
Subject
Screen zooming when power is turned on

SYMPTOMS

The ABL circuit is activated by the initial drift of the CRT
when
the power is turned on, possibly causing screen zooming.

RESOLUTION

Change R931 on the D Board in the above-mentioned sets from 1.2k
to 1.0K.

Ref Description Part Number
R931 Metal Film Chip resistor 1.0K 1/10W 1-216-651-11



Be sure to check and adjust auto white balance if necessary in
order to correct the change in luminance due to long-time use. This
change will not cause any problem about the X-ray control standard.

MORE INFORMATION
o

Unit/Model Details
o

Parts
o

Links

Unit/Model Detail
Unit(s): SN Start SN End Factory Family Name Product
Category
CPDG500 ALL ALL INY G1 C/P
GDM5402 ALL ALL C/P
GDMF500R ALL ALL INY G1 C/P

Parts
Part Number Reference Number Description Symptom Code
Section
Code PCB Reference Defect Code Repair Code
1-216-651-11 R931 Metal Film Chip resistor 1.0K 1/10W 1336
VPA D A I

Interesting that the over-brightness is cured by replacing IC1001 with ' a micro-computer for which measures have been taken'. Perhaps this is a simmiliar micro controller with updated firmware burned into its rom? It looks like the problem was a software bug after all.

My P991 exhibits screen zooming on power on. I will try this fix when I get the time. It concerns me that the 'X-ray controll standard' is mentioned, perhaps the ABL circuits limiting of average brightness was just an x-ray safety measure? Could changing the register values that controll the ABL make your monitor an x-ray hazzard? The ABL_SHUTDOWN register shuts the monitor off if the average brightness becomes momentarily too high (such as after switching from a black to white screen) before the ABL can act to dim it, I thought this had to do with protecting the monitor, not the user.

Good luck to everyone, hope RAYMAN's info gives you some insight. Thanks RAYMAN!

Dcnv is available for the Sony GDM FW900 as its not blanked out in windas
but when i change any of the values it does not seem to do anything.

I have tried selecting different areas of the screen(its displayed in sections/squares) but it does not seem to effect the red green of blue guns alignment.

Is there anyone who has used this and if so can you tell me how Dcnv functions.
Thanks

Start from the left, then move right. The changes on the far right are barely noticeable., changes on the left are a lot more drastic. I sugest displaying a crosshatch and running DAS on another computer.

When you start up DCNV it will start in the sugested starting location, each time you hit next it will move you through to the sugested ending position. If you do the whole screen in that order you should end up with perfect convergence.

Unfourtunately, making small changes to just the parts you want to fix doesn't always work out, as it then affects other places, so you may have to do the whole screen in the sugested order even to fix just a bad corner. (Depends on how bad the corner is really, if it's small you may be able to get away with fixing just it)

Whatever you do, make sure to converge on a crosshatch, and make sure your geometry and static convergence settings are done first (if you decide to change them at all). I had reset my dynamic convergence to the defaults (looks horrible) then did the geometry, then did static convergence (gave the center of the screen priority while ignoring the conerners/edges), then dynamic convergence. It took a long time, but gave better results compared to just tweaking the edges and corners.

Good luck.