Wells WG D9200 No OSD On Screen Display Issue

[Keroppi]

Hi all, I just picked up a GT cab with an original D9200 (not D9204/etc) in it. It displays fine (surprisingly) but the OSD doesn't work. The control board does, and the software responds, as I managed to (eventually) blindly press buttons and get to (and adjust) the H-POS and contrast menus...I understand this to be controlled on the neckboard, but I am finding conflicting info on it. WG troubleshooting guide points at IC201, but other forum posts such as http://forum.arcadecontrols.com/index.php?topic=105867.0 indicate that it is IC202. Can anyone verify what to check/which it is, and a source/part # for the chip?

Also, could the "corrupt EEPROM" issue I keep reading about cause this behavior? If so, could someone walk me through the SEL+DOWN factory memory recall (blind, by number of button presses) Thanks!!!

[grantspain]

only time i have seen this is when the screen volts/brightness is too low but if that is the case when you have no video connected then you would not see the "no signal" message

[Keroppi]

The only time you have seen what? The OSD not show up?
The 'No signal' message DOES show up when no signal is connected just fine, and cycles through all the colors.
I could adjust the 'screen' control, but it is at a satisfactory level...
Also worth noting, although I can blindly go through the menus, SEL does NOT degauss the tube.
What exactly are you recommending here? Thanks!

[grantspain]

what you just described ruled out what i was thinking

ic201 is marked as a possible fault on the wg fault guide although I would have been inclined to look at ic101

[lilshawn]

i would look at pin 19 of IC202

IC202  feeds the osd output into an additional input on on IS 201 on pins 1/2/3 (RGB) but it also feeds a high signal on pin 4 to switch on the OSD inputs of ic201 to display them.

it should be high  to display the OSD and low to display the video.

check the connection between pin 19 of ic202 and pin 4 of ic201 there is also a resistor r227 (33 ohm) check that too.

[Keroppi]

Thank you, lilshawn.

I was looking through the schematic, and saw the OSDBLK (blanking?) signal but wasn't sure if it show be low or high, constant or toggle. Now I know.
Since you are knowledgeable, would you allow me to ask a couple of things?

1) It appears that the OSD data/commands are fed into IC202 pins 7-8 by IC101 pins 36-37...what sort of signals should I see coming through here to assess that IC101 is outputting to IC202 properly?

2) Is the 'NO SIGNAL' message overlay'd by IC202? If so, wouldn't that mean that IC202 can clearly bring pin 4 high? I would *assume* that if IC202 creates the message, it would do so by not detecting the V-SYNC signal from pin 1, which would mean IC202 failed on the input side or is not being fed correctly by IC101?

3) Since the non-working degauss circuit is controlled from IC101 pin 1, should I suspect IC101?

[Keroppi]

I checked it again today, and the menu *does* actually display, but it is shifted to the very bottom of the screen, to the point you can see the 'MAIN MENU' text and nothing else. All of the sub menus and the rest of the main menu are off of the screen. If I enter the service mode, the display changes and "collapses" the very bottom portion of the display, so the visible menu area becomes a distorted line.

The display does not fill the screen vertically, and the vertical position is all the way at the top. These *might* be affecting the menu display. I'd like to try adjusting the V-SIZE and V-POSITION to fill the screen, but I can't seem to get to those menus blind  ...could someone *please* walk me to/through it blind? It appears that the menus (in order) are:

CONTRAST
BRIGHTNESS
H-POS
H-SIZE
V-POS
V-SIZE
PIN
TRAP
GAIN
  R
  G
  B
RE (Recall?)

...But I don't know where it starts, or any sub messages or confirm screens or anything. I need something like:
*MENU*  <- Enters main menu, which item is already selected?
*DOWN* <- Item? Is it ordered as I listed?
*DOWN* <- (How many times?)
*DOWN* <- V-POS (or V-SIZE)
*SEL* <- Into Sub-menu
*Up* or *DOWN* to adjust
*MENU* <- Out of Sub-menu
*MENU* <- Out of main menu? Any confirm/save dialog or anything?

Is that about right?
Can you change the OSD position in the Service Menu? If so, I Really just need that walk-through. Anyone who can help, it would be greatly appreciated. Thanks!!
 

[lilshawn]

unfortunately i don't have a game in the shop right now that has a 9200.

you have to hold DOWN and SELECT at the same time to enter the service menu but as far as i know there is no OSD positioning adjustment there.

being at the very bottom of the screen is very unusual. Perhaps giving John Pruski (jpruski@wellsgardner.com) at Wells Gardner an e-mail and describe the symptoms to him, he might have some info.

[grantspain]

this may help you

[Keroppi]

Thank you both for the responses. There definitely isn't an OSD position in the service menu based on that PDF...basically the same as the std menu+bias/gain.
 
I managed to fumble through some of the menus today blind, and increasing the V-SIZE made another problem apparent: The bottom 2 inches or so of the screen have collapse (vertical deflection problem?) and I can faintly see one retrace line at the bottom of the displayed raster...when I would extend the raster into the area, all of the added raster would add into one line. Evidently the previous owners shrunk the raster to fit within the "good" area...Entering service mode calls the factory settings, which fill the screen, hence why the menu would shrink to one line at the bottom...the menu is almost off the screen regardless, it just can't display the raster across the whole tube correctly on top of that.

I found this service bulletin:

TECHNICAL SERVICE BULLETIN
WELLS GARDNER MONITOR
Model: WGM2792-U0TS09B

This service bulletin addresses the following field reported problems with the current Wells Gardner digital monitor chassis.

Symptoms:

The upper portion of the display shows retrace lines during active video display.
The upper portion of the display appears “Dim” and/or “Washed Out” when compared to the lower portion of the display.
The lower portion of the display shows retrace lines during active video display.
The lower portion of the display appears “Dim” and/or “Washed Out” when compared to the upper portion of the display.
The above listed symptoms appear randomly, often after the unit has been operating for a short amount of time. The symptoms may appear and disappear during normal operation.

Analysis:

The electrolytic capacitors in the vertical sweep circuitry have failed. Symptoms 1 and 2 are a result of C306 (2200uF, 25V) failing. Symptoms 3 and 4 are a result of C314 (2200uF, 16V) failing. Both capacitors are located adjacent to the vertical sweep transistor heat sink. The failure is a result of the electrolytic fluid inside the capacitor boiling and/or out gassing, causing the capacitance to decrease. This boiling and/or out gassing also results in a visual deformation the capacitor case. The deformation is typically exhibited by a “Doming” of the top of the capacitor case.


Resolution:

Remove capacitors C306, C308 and C314. Replace C306 and C314 with new capacitors (2200uF, 25V, 105 degrees C. temp) and C308 (220uF, 50V, 105 degrees C. temp.).

Additional Information:

Contact Wells Gardner via FAX at 1-708-290-2200 to request the capacitor service kit (P.N. S-Kit Cap 2792).

Is there any other caps to replace or things to check that you guys could recommend based on the prognosis?

And do you think the 2 could be related, vertical deflection issue and an OSD with improper (vertical) position?

I figure I should get the monitor otherwise 100% before harassing WG about it...so they can tell me to buy an LCD...

Thanks again!

[lilshawn]

don't worry about harassing WG, it's their job.

replacing capacitors is generally a good idea. if you have ready access to caps you may as well change them.

i'm thinking also you may have an eeprom issue. there is separate configurations for all modes and resolutions including one for the OSD. i'm thinking it's been corrupted.

while not impossible to fix i'm not quite sure how you could easily. i have en eeprom burner, so i would just dump a copy from another unit onto my bad eeprom and hope for the best. in your case you may have to try and source a replacement eeprom.

i've heard of cases of the eeprom info getting corrupted by the monitor. there is a way to mod the rom in such a way as to lift out the pin that enables the WRITE. you have to set up the monitor how you like it first as you cant change it after without putting the pin back (or a switch).

i'm beginning to think this might be part of your issue.