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Dead chassis?


mR_CaESaR

Question

Is my chassis dead?

 

Last night I tried turning my racing cab on and I can't get any picture...

 

The boot sequence completes and I just get this grey screen.

 

3f2ae615bdf9406bcaeafd289631b290.jpg

 

Definitely a glow on the neck

 

d46601a080535773a6d5f8f2893649ea.jpg

 

The jpac is showing that it's in sync.

 

eca94bcee1ab36c0d138cc6f40f991d0.jpg

 

Last week it was working perfectly fine.

 

c7eb56c8bcb3a0dbd1b2739d1a7cc093.jpg

 

5b36bbdde9777f3113b7810f503105e8.jpg

 

110034b0f1f987a801dd3f8480ecfc51.jpg

 

Any suggestions?

 

 

 

Sent from my SM-N950F using Tapatalk

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Weird for a chassis to be dead but still show a raster. Usually when a chassis dies you will get nothing at all, as the chassis has blown a fuse and has no power. Or, you will get things like a horizontal or vertical collapse line.

 

Yours is showing a perfect raster, which I've never seen when a chassis dies. Not saying it isn't dead, just something I haven't seen when a chassis dies.

 

Jomac will know :)

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I'm not sure where or what that is... Is it safe to do so whilst turned on?

 

Edit: after some googling, I turned it all the way down and it's still giving me the same result.

 

I've tried putting a Pandora's box and changed it back to 15khz, same result..

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I've pretty much come to the conclusion the chassis is dead.

 

Had a spare 29 inch tube and MS9... And voila! We have picture!

 

601ad700fdb6999d7c17be1ae99ab5f9.jpg

 

Need to change the rgb clipping pots to get a respectable picture.

 

I just hope this fits in LAI racing cab

 

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Check this site, looks like the same issue your having: https://forum.arcadeotaku.com/viewtopic.php?t=34650

 

I would like to think I'm pretty OK with a soldering iron, but I'd be too scared to touch the chassis.

 

Joey said what I'm seeing is most likely a dead sync module.

 

Also got referenced to this thread:

 

https://www.aussiearcade.com/showthread.php/68425-Hold-issue-on-MS8-26SE-chassis/page2

 

I thought I was careful with booting and thinking the jpac protects the signal, but I guess going forward, I'm going to need to be more diligent with powering on and off the monitor when there's no signal.

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Struggled to get picture at first...

 

Kept on getting this..

 

fa3fa7a1f02a422055809e0d16494164.jpg

 

Then HH24 pot and assumed its horizontal hold 24khz.. A little turn and voila! We finally have 24khz picture again!

 

2e1b3ce119bd148c50817897f2b06871.jpg

 

7364631eb6e33d2cb2834c89bbdd3a4c.jpg

 

77ee07f339c86ad8eb954e63a55c60f5.jpg

 

Need to adjust as it looks washed out.

 

Next step is taking it off the floor and popping it into the cab!

 

0363040aee7eee6c472b6a90ec5ab886.jpg

 

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Well the mounting of the 29" MS9 was a massive PITA for me since the frame didn't have the correct mounts as the other Sega Japanese racing cabs and I didn't really have to skills to fabricate it.

 

Sent the chassis to Jomac and she's come back fixed!!

 

19fd81be85aca9b835fcde91fc572604.jpg

 

I'm not sure who's happier, me or the kids :) :)

 

 

Sent from my SM-N950F using Tapatalk

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The blank screen with retrace lines means that the RGB amplifiers (the three transistors mounted on heat sinks on the neckboard) are not working and the most obvious reason is that they're not getting the supply voltage. This is typically 180-200VDC from the flyback (sometimes called video B+). This line usually has a fusible resistor that can go open. On a Nanao MS8-26 it's R570 near the flyback.
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