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(Topic ID: 273896)

Pinbot not booting after NVRAM installation


By sixleggeddog

3 months ago



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  • 23 posts
  • 10 Pinsiders participating
  • Latest reply 3 months ago by sixleggeddog
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#1 3 months ago

I bought an NVRAM chip for pinbot a while ago and just got around to putting it in. I removed the batteries from the battery pack (but didnt unsolder or remove the pack itself yet). Then, I unsoldered the U25 chip and soldered in the socket. I then plugged in the NVRAM chip and put the board back in Pinbot. When I turn Pinbot on now, the lights turn on, but the cpu is locked up (game doesn't boot, nothing on the displays, etc.). I checked that the board is getting the correct voltage (and it is). I also checked and made sure that the chip was getting continuity to the correct locations on the board at each pin. The game was working perfectly before I installed the chip, so not sure what went wrong. Anyone have any thoughts?

Appreciate your help.

Thanks,
Bill

#2 3 months ago

It is not a coincidence that the game ceased working after NVRAM install.
You can install the original RAM to ensure the issue is not with the NVRAM module itself (unlikely).
It is more probable that a trace was damaged or a solder bridge was created.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#3 3 months ago

Is the chip oriented correctly?

#4 3 months ago

Thank you both for your replies!

Quoted from Billc479:

Is the chip oriented correctly?

The chip is oriented correctly.

Quoted from ChrisHibler:

It is not a coincidence that the game ceased working after NVRAM install.
You can install the original RAM to ensure the issue is not with the NVRAM module itself (unlikely).
It is more probable that a trace was damaged or a solder bridge was created.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

I checked to make sure there were no solder bridges created, and checked for continuity at each leg of the chip so I know that none of the traces were damaged.

Unfortunately, I cut each leg of the chip to make the unsoldering easier (made it easier to not damage any traces pulling the whole chip out) so I can't just plug it into the socket. I guess I might have to buy a replacement U25 then just to make sure it's not the NVRAM itself.

#5 3 months ago

Did you remove the batterys before installation?

Edit:
Looks like you did, overlooked that part

#6 3 months ago

first off, post a pic of the nvram you have.....also you could order the old memory chip just to verify your socket is good....also what processor do you have? then we'll go from there...

#7 3 months ago
Quoted from Billc479:

Is the chip oriented correctly?

And check to make sure a pin on the NVRAM didn't get bent when being inserted into the socket. Lot's of times, it still looks like it's in socket but in actuality it bent flat against the bottom of the chip.

Also, are you sure you got the correct NVRAM? Which one did you get?

#8 3 months ago

FYI for testing purposes and I guess being able to play if you find out the NVRAM is bad - if you have a bunch of resistors or diodes cut the wires off and solder them onto the old chips legs and insert into the socket and see if she fires.

#10 3 months ago
Quoted from Startek2:

first off, post a pic of the nvram you have.....also you could order the old memory chip just to verify your socket is good....also what processor do you have? then we'll go from there...

Here's a picture of the NVRAM. Not sure what you mean by what processor I have - all of the boards in the machine are original.

Ordering the old memory chip might be the next step.

Also, I was checking continuity between each pin to make sure that I don't have a solder bridge (even though visually it seems clear that there are none.

I am getting continuity between pins 6, 7, and 8, 17 and also between 9 and 10. It really doesn't look like there are any bridges though. Anyone know if this is normal? Otherwise I might have to unsolder the socket completely and then check for continuity between these pins with the socket out. Then resolder the socket back in. I am reluctant to do this because the solder joints look good though.

IMG_9340 (resized).JPG
#11 3 months ago

Please post a picture of the board at an angle showing underneath the U25 IC socket. There should not be any solder shorts between the pins 6-7 nor 9-10.

#12 3 months ago

Hm, I actually saw this article, but I used the 6116 NVRAM, and pinbot is a system 11a so sounds like I should not have to worry about the jumper.

#13 3 months ago
Quoted from PinballManiac40:

Please post a picture of the board at an angle showing underneath the U25 IC socket. There should not be any solder shorts between the pins 6-7 nor 9-10.

Here's a picture of the top and bottom of U 25. Think it's worth removing the socket and resoldering?

IMG_9341 (resized).JPGIMG_9345 (resized).JPG
#14 3 months ago

Yes. I would remove it, retest pins 6-7 and 9-10 before reinstalling it.

#15 3 months ago
Quoted from PinballManiac40:

Yes. I would remove it, retest pins 6-7 and 9-10 before reinstalling it.

Thanks - bet this is the issue. I'll do that now and report back.

#16 3 months ago

I would test continuity from topside to bottom side before removing it. If you have continuity and no solder bridges there's no point of removing the socket. You're potentially taking more risk at damaging traces otherwise

#17 3 months ago

I know these IC sockets have thin legs so it makes it easy for too much solder to flow up the legs if you leave the heat on too long or add too much solder. The wide IC socket frame is likely hiding the solder bridge between pins 6 and 7.

#18 3 months ago
Quoted from PinballManiac40:

I know these IC sockets have thin legs so it makes it easy for too much solder to flow up the legs if you leave the heat on too long or add too much solder. The wide IC socket frame is likely hiding the solder bridge between pins 6 and 7.

Yup - I believe this is what happened. Desoldered and cleaned it up, and after resoldering the socket and plugging the nvram in - it now boots up! Thanks for your help.

Although - now when I press the start button instead of starting a game up it just displays the rules for Pinbot. Hoping that it shouldn't be too hard to figure out though. Might just be a setting or something... I'll have to report back.

#19 3 months ago

Looks like some gunk here between 9 and 10

20200726_135807 (resized).jpg
#20 3 months ago
Quoted from Tomass:

Looks like some gunk here between 9 and 10
[quoted image]

Already pointed out and solved.

#21 3 months ago
Quoted from sixleggeddog:

Although - now when I press the start button instead of starting a game up it just displays the rules for Pinbot.

Did you go in the settings and set for free play or add credits to the game?

Default game setting is set for the player to add credits after changing batteries or adding NVRAM.

#22 3 months ago

Mark it "solved" for others

#23 3 months ago
Quoted from PinballManiac40:

Did you go in the settings and set for free play or add credits to the game?
Default game setting is set for the player to add credits after changing batteries or adding NVRAM.

Yup - just came here to post that you just need to set it to free play. Everything is working great. Thank you all for your help!

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