Sega ST-V problem

Check your power supply and make sure all the voltages are correct.

 

99% chance it's the SH2 cpus - hold them pressed down to the board when you boot it up and see if it lasts any longer before freezing. Whenever I start having this problem with mine I pull out a heat gun and blast them with it, usually lasts a few months.

 

I had same problem on a ST-V board i had, ended up re flowing those CPU's there known for going

 

Please don't reflow it with a heat gun - STVs are rare enough as it is! Take the time to send it to someone on here who can resolder it for you properly, then you won't risk frying it and it will stay fixed once it's fixed :thumbsup:

Stone

 

They're totally standard JAMMA - well, excepting that one of the unused JAMMA pins is used as a pause button (for magazine screenshots). You have a cart problem or a motherboard problem.

Stone

 

This.

Reflowing the joints of an SH2 isn't remotely difficult for anyone with the proper tools and experience. Heatgunning the poor thing is about as good an idea as patching a small hole in your radiator by cracking an egg into the coolant. Sure it'll work, but what damage are you going to do in the process?

 

Is the chip in a BGA package? or is it like TQFP144?

 

They're big QFPs. If you have the right tools it only takes 20 seconds tops to reflow one - maybe 5 minutes if you remove it, wick the pads clean, apply new solderpaste and reflow it back on.

I'm pretty sure it's a four-layer board so heat-gunning it is likely to cause nasty differential expansion depending on what geometry's on the inner layers - worst case is a delaminated board which is a nightmare to fix. And you'll probably burn the soldermask too, so it won't resist the solder properly when you try and reattach it properly. If it was a genuine fix then after each time you attack it it would stay fixed!

Stone

 

Well shit, I didn't think heatgunning it was so bad for it. Although to be fair I've only done it twice so far >.>

Anyone want to properly fix my board for me?

 

Tqfp are easy enough. And heat gunning stuff is never the right solution.

Personally, soldering iron + flux = done. I only use hot air or my Ir station for components with pads under the component... Bga, qfn, wson etc

All these xbox 360 fixes just make me laugh for the same reason.

 

They're rare? I didn't think they were that rare. Mine was pretty cheap, and it came with Die Hard Arcade.

 

yeh mo at Videotronics had a pile of them, all broken though , but he had a pile of them