WG 27D9202 no sync

ELutz

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I'm fighting with a Wells 9202. It started out dead. Now, I've got it back to life. If I run a VGA signal (via a 60-in-1 board) into it...it looks great, though, I can't get the menu to come up. If I move the jumper on the input board and run a CGA signal into it. It won't sync properly. It looks how a monitor looks when you run the wrong resolution into it. Though, with a CGA signal, the menu does try to come up. It actually pops up for a second and then disappears. I also ran EGA into it, and it behaved the same as CGA (looked like it was running with the wrong resolution).

I capped the entire chassis. Touched up many cold solder joints (many on the input board). I've doubled checked cap polarity, checked solder splashed.....what am I missing? It looks beautiful with a VGA signal:confused:.

Thanks!
Edward
 
Have you done a factory reset yet? Sometimes before a reset you'll get one mode working while other modes don't, or don't properly...
 
Oh, and I had one of these once that had an issue with that input selection board. Even moving the connector from VGA to CGA/EGA and hooking up the normal monitor molex, it wouldn't work. Swapped in another of those little boards and it worked fine...
 
If you try switching the monitor into CGA mode with the VGA board (or vice versa) does the picture change?

With the monitor set to CGA/EGA, but sending a VGA signal into it.....I get a blank screen (not even the "no signal" box.

With the monitor set to VGA, but sending a CGA signal into it.......I get raster with the same sync issues (like when it's set to CGA with a CGA signal), but no image.

Edward
 
Oh, and I had one of these once that had an issue with that input selection board. Even moving the connector from VGA to CGA/EGA and hooking up the normal monitor molex, it wouldn't work. Swapped in another of those little boards and it worked fine...

You know....I've got another one of these in the shop (it's also dead....well, ticking). I did compare the input boards. This one had a few ceramic caps....the other one did not....just legs (looked like someone snipped them off.....or they vaporized:D). I'll try swapping them. How do you do a factory reset?

Edward
 
How do you do a factory reset?

Edward

get a stable image on the screen, then hold down the DOWN and SEL buttons at the same time. Once the Factory Menu pops up, go to RE and select it. After that, adjust brightness and colors up in the Factory Menu, then exit to the regular menu and adjust brightness, colors, and geometry to where you want. Then try your different modes again and see if that helped...
 
get a stable image on the screen, then hold down the DOWN and SEL buttons at the same time. Once the Factory Menu pops up, go to RE and select it. After that, adjust brightness and colors up in the Factory Menu, then exit to the regular menu and adjust brightness, colors, and geometry to where you want. Then try your different modes again and see if that helped...

Thanks Steve!

Edward
 
Sync?

I'm fighting with a Wells 9202. It started out dead. Now, I've got it back to life. If I run a VGA signal (via a 60-in-1 board) into it...it looks great, though, I can't get the menu to come up. If I move the jumper on the input board and run a CGA signal into it. It won't sync properly. It looks how a monitor looks when you run the wrong resolution into it. Though, with a CGA signal, the menu does try to come up. It actually pops up for a second and then disappears. I also ran EGA into it, and it behaved the same as CGA (looked like it was running with the wrong resolution).

I capped the entire chassis. Touched up many cold solder joints (many on the input board). I've doubled checked cap polarity, checked solder splashed.....what am I missing? It looks beautiful with a VGA signal:confused:.

Thanks!
Edward

Did you fix it yet?
I dought a factory reset will work here!
You must have a good stable OSD to reset it.
if yours is dropping out,i would check the sync decoder board
check the dc and Horiz and vertical sync pulse is good,or the osd won't work.
Let us know what you find.
 
Did you fix it yet?
I dought a factory reset will work here!
You must have a good stable OSD to reset it.
if yours is dropping out,i would check the sync decoder board
check the dc and Horiz and vertical sync pulse is good,or the osd won't work.
Let us know what you find.

You know, this is by far the worst monitor I've ever worked on. I got it working (sort of).....

If I ran a VGA signal into it through the D-15 connector, with the monitor jumpered to VGA....I got a nice picture, but the OSD wouldn't display.

With the monitor jumpered to VGA and a VGA signal running into it, but using the .156 molex connector....I got a blank screen....no OSD, either.

If the monitor was jumpered for CGA/EGA and I ran an EGA (or CGA) signal into it through the .156 molex connector....I got an out of sync picture. The OSD would come up, but with it bouncing around....it was very difficult to read. I did notice, with the CGA signal, the OSD was stating 31 something kHz. I also ran a CGA signal into it through the d-15 connector with the same results......and the same 31 something kHz on the OSD.

Next I ran a CGA signal into it through the D-15 connector, but with the monitor jumpered to VGA. I got a nice picture, and the OSD would display. Setup like this the kHz would change between 15.3 and 15.9.

I tried various other combinations between the D-15 connector and the .156 molex input connectors, the resolution jumpers, and different signals running into the monitor. This monitor came out of a San Francisco Rush 2049. At some point, I said screw it......stuck it into the game and fired it up.....it came up with a beautiful picture. The OSD worked, so I adjusted everything......and called it done:)

Edward
 
You know, this is by far the worst monitor I've ever worked on. I got it working (sort of).....

If I ran a VGA signal into it through the D-15 connector, with the monitor jumpered to VGA....I got a nice picture, but the OSD wouldn't display.

With the monitor jumpered to VGA and a VGA signal running into it, but using the .156 molex connector....I got a blank screen....no OSD, either.

If the monitor was jumpered for CGA/EGA and I ran an EGA (or CGA) signal into it through the .156 molex connector....I got an out of sync picture. The OSD would come up, but with it bouncing around....it was very difficult to read. I did notice, with the CGA signal, the OSD was stating 31 something kHz. I also ran a CGA signal into it through the d-15 connector with the same results......and the same 31 something kHz on the OSD.

Next I ran a CGA signal into it through the D-15 connector, but with the monitor jumpered to VGA. I got a nice picture, and the OSD would display. Setup like this the kHz would change between 15.3 and 15.9.

I tried various other combinations between the D-15 connector and the .156 molex input connectors, the resolution jumpers, and different signals running into the monitor. This monitor came out of a San Francisco Rush 2049. At some point, I said screw it......stuck it into the game and fired it up.....it came up with a beautiful picture. The OSD worked, so I adjusted everything......and called it done:)

Edward
Ok if the input board is good.
and sync decoder.
the osd should be working at all times..
at each frequency.or its missing a sync pulse
or may be weak,i mention it because i found
it bad once before.

you may have a leaky mosfet.
like Q415,and q416 one way to tell
if either heatsink is hot within 2 minutes
it needs to be replace.Just a tip.
i understand it doesn't matter now.
things to look for next time.
its kinda like more then one mosfet
on at once for Horiz-scan switching.
Check the freq-table for correct turn on
in the schematic.
 
Ok if the input board is good.
and sync decoder.
the osd should be working at all times..
at each frequency.or its missing a sync pulse
or may be weak,i mention it because i found
it bad once before.

you may have a leaky mosfet.
like Q415,and q416 one way to tell
if either heatsink is hot within 2 minutes
it needs to be replace.Just a tip.
i understand it doesn't matter now.
things to look for next time.
its kinda like more then one mosfet
on at once for Horiz-scan switching.
Check the freq-table for correct turn on
in the schematic.

Thanks for the tips!! I'll check those mosfets.

Edward
 
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