(Topic ID: 135676)

JP won't boot. Please help!


By RampShot11

4 years ago



Topic Stats

  • 23 posts
  • 6 Pinsiders participating
  • Latest reply 2 years ago by RampShot11
  • Topic is favorited by 2 Pinsiders

You

Linked Games

#1 4 years ago

Hi Guys, I took in a freinds JP because it would not boot up for him. He had the game slam tilt on him and after that the game would not longer boot. I did find a blown capacitor on the PSU at C2 and replaced it with the same results. Also, there are no leds lighting on the MPU board at all. I checked all the fuses on the PSU and they are good. If someone could help point me in the right direction, I would greatly appreciate it. Thanks.

#2 4 years ago

http://techniek.flipperwinkel.nl/desega/index3.htm is the best source of information I've found for D.E. issues / repair.

#3 4 years ago
Quoted from bobukcat:

http://techniek.flipperwinkel.nl/desega/index3.htm is the best source of information I've found for D.E. issues / repair.

Thanks you. Hopefully they have a section that explains no led lights on the CPU upon boot up. Very informative so far though.

#4 4 years ago

Good luck! I know it can be infuriating and frustrating. My only advice is to start with the power supply and if/when you can completely rule that out then move to the CPU. If you've got a machine to test in that certainly helps, but my JP CPU ran my LAH just fine but not the JP.

#5 4 years ago
Quoted from blondetall:

Good luck! I know it can be infuriating and frustrating. My only advice is to start with the power supply and if/when you can completely rule that out then move to the CPU. If you've got a machine to test in that certainly helps, but my JP CPU ran my LAH just fine but not the JP.

Thanks. I actually read most of your post on this game/issue, but it seems our issues differed after a certain point. Unfortunately, this is the only Data East game I have to work with right now. Would help big time if I could try a different PSU.
Were you getting any led's to light up on the MPU when you turned the game on?

#6 4 years ago

With mine, the power supply blew up and had to be replaced, then it worked fine for awhile slowly getting where it wouldn't turn on and you've have to flip the switch a few times, then it wouldn't do anything. When I'd flip the switch, it would light up the playfield/MPU lights/roar noise for literally 1 second or less. It was like someone flicking a light switch on then off really quick... power then nothing. Sometimes it would fire off every coil just to freak me out, and sometimes it would do the roar noise and the MPU lights would be on (left and center) but nothing else. Occasionally it would appear to power up and do the OPEN COIN DOOR, but as soon as I opened the door it would die. That's why I was having such an issue trying to diagnose it, because it wasn't being consistent about anything. When it would have the MPU lights on long enough for me to test voltage, it was also 4.9 or 5 volts like it should be. I honestly have no idea what the actual problem was, as the MPU board looked totally fine and ran our LAH when we tested it there, but putting in a new one has it fixed. (Knock on all the wood.)

#7 4 years ago

Hey Rampshot. There is a 5 volt led on the cpu board. If that is not on the game won't boot so I would start there. Check 5 volts at the power supply board and then at the cpu. Check the power supply fuses with a meter.

http://techniek.flipperwinkel.nl/desega/index2.htm#poweron

#8 4 years ago

Thanks Terry. I have to check the 5v with the game on right ?

#9 4 years ago
Quoted from RampShot11:

Thanks Terry. I have to check the 5v with the game on right ?

Yezzzzz.....
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#10 4 years ago

Ok so I found a bad capacitor C2 on the power supply , it was leaking onto the trace. I replaced the bad cap fired the game up and.... Nothing. Went back and used a new lead from a different cap I had and resoldered the bad trace and it booted right up!! But... I now get no display at all. My question is , how do I test the display board to make sure it isn't blown? Thanks.

#11 4 years ago
Quoted from RampShot11:

I now get no display at all.

First, make sure you didn't knock the power cable loose from the display board. Mine was very touchy. A little wiggle, and it came back on. I ended up replacing the connector, and have no more issues.

#12 4 years ago
Quoted from woody24:

First, make sure you didn't knock the power cable loose from the display board. Mine was very touchy. A little wiggle, and it came back on. I ended up replacing the connector, and have no more issues.

If you mean the little connector with the red and black cable going to the display board, I reseated it and also tested the voltage to the back of it and everything seems fine with it. But I'll double check it. Thanks.

#13 4 years ago
Quoted from RampShot11:

Ok so I found a bad capacitor C2 on the power supply , it was leaking onto the trace.

Very common.
http://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#Missing_5VDC
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#14 4 years ago

Could someone step me through testing the power to the Dot Matrix display? I tested the 8 pin connector going to the display how i think you are supposed to, and it seems like I am not getting a good reading on pin 8 which is the +68vdc. I set it to DC volts and put the red lead of the multimeter to the pin 8 and am not getting anywhere close to 68volts. Also, what on the PSU would be responsible for providing the +68vdc to the dmd? From what i've read it seems to be TR3 & TR4. Can someone confirm? Thanks.

#16 4 years ago

Thanks Chris. I guess I was testing it correctly last night. I'm getting almost no voltage at the +68 v pin.

#17 4 years ago

And that will cause a blank display. Time to rebuild the HV circuit.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#18 4 years ago
Quoted from ChrisHibler:

And that will cause a blank display. Time to rebuild the HV circuit.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

Chris, What would you suggest replacing first? TR3 & TR4 the NPN transistors MJE340?

#19 4 years ago

Everything except the last two lines of this shopping list...but, measure the 500 ohm resistor just to be sure.

+68v circuit
Part Description Location Equivalent
MJE340† NPN transistor TR3 MJE15030
MPSA92 PNP transistor TR1 available
1n4760B 68v zener diode D9 available
1n5228 3.9v zener diode D6 available
1n4004 diode 400v @ 1A D5 available
47K resistor 1 Watt R8 available
330K resistor 0.5 (1/2) Watt R11 available
1.5K resistor 0.5 (1/2) Watt R12 available
500 ohm resistor 10 Watt Ceramic R15 available
100uF @200v Capacitor C10 e.g. 150uF @250v

Cut the old parts off. Don't try to solder suck the parts off. DE boards are pretty fragile.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#20 4 years ago

Ok thanks. I have most of those components on hand so I guess I'll start with the transistor at TR3. Much appreciated.

#21 4 years ago

You should replace ALL of the parts, all at the same time. If you don't, a failed part will cause the good part you just installed to fail. I've gotten by in the past by replacing individual parts, but it's dicey.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#22 4 years ago

I replaced TR3 last night but it didn't help. Wish I would have saw this message before I popped it back in. And you are right, that board is very fragile, I almost pulled the through holes put where the old transistor was.

1 year later
#23 2 years ago

Just a heads up, I know it's been a while but figured someone could get something out of this. I rebuilt every component listed above by Chris and now the dmd is perfect. Thanks all for the help.

Promoted items from the Pinside Marketplace
3,600
Machine - For Sale
The Colony, TX

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside