New WG d9200 monitor stuck in 31 khz mode. Please help

[BurgerKingDiamond]

I just transplanted a very squeaky clean (therefore I'm assuming barely used) d9200 monitor into one of my cabs.

It worked fine for about a week in both 15khz and 31khz modes. I went back and forth several times between JAMMA boards and my laptop by switching the video hookup to the correct header (it's not an auto-switching monitor).

But, today I tried switching back into 15khz mode but the screen is saying NO SIGNAL and I know that it's not going into 15khz mode because the monitor never does that characteristic 15khz hum. 

Any ideas? I really don't know what to do about this.

[MonMotha]

The D9200 actually is auto switching.  The only thing changing the connector on the back does is adjust the expected signal levels and termination.  The options are 3V with high-Z input (suitable for more low-res arcade boards) or 0.7V with 75-ohm input termination (suitable for PC sources regardless of resolution).

The D9200 runs at 31kHz (VGA) unless it receives another signal to sync up to.  Therefore, if it's not seeing a sync signal, it will display the "NO SIGNAL" message at 31kHz.

Check that you've got a signal applied.  The video signals are not important, but the sync signal of course is.  Use another arcade board or similar to test.  It's possible that you don't have a monitor problem at all.  Also check that the connectors are not damaged.  All that switching may have cracked a solder joint loose or something.  You can safely apply 15kHz to the "VGA" input on it; it just may be too dim or too bright, depending on the signal source.  It should sync right up, though.

[BurgerKingDiamond]

Thanks. I tried another board and it worked fine. So the monitor actually waits to see the 15khz signal and then switches into that mode? I remember reading something about the d9200's that the electronics are known to burn out prematurely due to switching resolutions. So it seems to me that it would be better for the longevity of the monitor to stick to 31khz since that's default...

That's a shame since the low res picture looks so good on this monitor. I would really like to be able to go back and forth, but not at the expense of burning something out and having to pull out the monitor again and go into repairs. What do you think?

[MonMotha]

The transient nasties upon mode switch are no worse than initial power up.  Powering it up with a 15kHz signal should put it straight into 15k mode, at least before anything has a chance to "settle" anyway so no harm no foul there.  The rapid switching that some people seem to do when running frontend at high res and game at low res does seem to stress them out a fair bit.  Whether it causes premature failure seems to be up for debate, but it can't help.

The D9200 is unfortunately a pain to work on: when they die, they tend to take out huge numbers of components on the board, so it may be wise to be nice to it.