WPC CPU problem

Hi guys.

Bought a CPU board from Whitewater, it had battery damadge.
Worked well, exept 4 buttons for menu.

LM339 ic and also U20 2803 ic was damadged.

both ics got new sockets.

Here is the problem, when U20 ic in the socked it burned fuse F115 3/4A RIGHT away.
When i take the 2803 ic off, put in a new fuse, game starts up. Volume up/down works BUT menu and Escape button is really f....d up, when i press menu, it acts as i pres menu/exit at once, same problem is when i press exit, then i makes sound 2 times it exits and enters menu.
Now some how, menu exit legs are shorted, DOES ANYONE know where to look?

More info, cpu board blows F115 on driverboard both in my normally fully working Hihgspeed 2 and fishtales.

#2 6 years ago

DEN

Inactive member

Anyone know whitch ic runs menu/exit button. I could try replacing that one

#3 6 years ago

ZAZ

zaza

Pinside+ Frequent

https://pinside.com/pinball/forum/topic/wpc-89-cpu-board-info

U16 Dedicated (direct) #5

compare orientation (notch) of U20 here as well.

#4 6 years ago

DEN

Inactive member

OMG Zaza i love u man
New socked on U16, new LM339 ic, looked at your scematic, and now.......... menu buttons works GREATTTTTT hell yeah

Now i need 2803 ic, its sold out at bestofpinball.de, damn!
Also put in a new socket for U20, thecked scematic, caaaaant wait to get another 2803ic now.

What will happen if i put in the bad U20 2803 ic again now? will it blow/damadge anything?

is it possible to check the 2803 ic?

#5 6 years ago

ZAZ

zaza

Pinside+ Frequent

OP
Quoted from DEN:
What will happen if i put in the bad U20 2803 ic again now? will it blow/damadge anything?
is it possible to check the 2803 ic?

If the old 2803 blows a fuse, the ic is shorted inside.
You can measure with a multimeter set to 'diode' and put RED lead on pin9 (see pic) and with black probe test all other 17 pins.
It should on all pins read 500-something mV.
If one or more gives a 'short', then don't use this ic again. I don't think it will blow something but it could confuse switch matrix.

edit: it will blow fuse again if there is a short between pin 9 and pin 10

u20- meten.jpg

#6 6 years ago

DEN

Inactive member

Zaza you are the man!!
Okey red on 9 all but one checks okey, leg 16 makes contuniuaty/beep sound.

Leg 9 and 10 is not shorted.

Is there any danger on trying it out?

#7 6 years ago

DEN

Inactive member

Sorry but, yeah i did it. HS2 starts up.
In switch test grn shrt row 1-2-3-4 at slingshot and luncher its shorted.

I did it. Board works. Now i only need a new 2803.

Its just 4 rows shorted and only leg 16 is dead. Is this possible or am i too hurry to bee happy??

#8 6 years ago

ZAZ

zaza

Pinside+ Frequent

At least cut/bend away pin16 of the 2803 and try again.

First 4 rows reporting a short could also mean a problem with U18.
With CPU-powered and J208/209/212 disconnected, pin 1+2+13+14 of IC U18 should measure +5Volt steady.

#9 6 years ago

DEN

Inactive member

J212 and j209 unplugged.

U16-17-18-19 all measure 5.02v on legs 1-2-13-14.

Why bend away leg 16??

#10 6 years ago

DEN

Inactive member

Ok i understand. Just bent leg 16. All grnd shrt row switches does not register in test mode.

New error also opto 1-2-3/switch 81-82-83 error probepley something with the leg 16 bend.

Just orderd 25pcs 2803. Yay

#11 6 years ago

ZAZ

zaza

Pinside+ Frequent

OP
Quoted from DEN:
Just bent leg 16.

Yes, because that was the one with a short to GND and it would only corrupt the switch-matrix.

OP
Quoted from DEN:
New error also opto 1-2-3/switch 81-82-83 error

That is column8 and are the only 3 switches (optos) that are used in that column (white-water).
U20-8 (input) and U20-12 (output).
Could be a broken wire, no supply to optos or U20 not working correct.

Better wait for the ordered parts and then continue with the switch-matrix.

#12 6 years ago

F X

Coyote

Pinside member

9y 107K 8,987

FYI, WPC software will mark an opto as 'bad' (like above here) when that opto is registered 'active' when it shouldn't be on bootup. It does not need to take 90 balls or so before being marked as bad.

#13 6 years ago

DEN

Inactive member

Ill wait for 2803. Will update again. But untill then. Im SO happy for all your help, thank you

#14 6 years ago

DEN

Inactive member

Quoted from zaza:
Yes, because that was the one with a short to GND and it would only corrupt the switch-matrix.

That is column8 and are the only 3 switches (optos) that are used in that column (white-water).
U20-8 (input) and U20-12 (output).
Could be a broken wire, no supply to optos or U20 not working correct.
Better wait for the ordered parts and then continue with the switch-matrix.

Cpu is from a white water

My HS2 does not have any errors on pf. So it must be only on cou board. Looking forward to 2803 ics

#15 6 years ago

DEN

Inactive member

UPDAAAAAATE!!!!!!
Got new parts home.
Replaced 2803. Game works perfekt

Thanks a million times friend

Now its time to fully shop this old pin.

IMG_0612 (resized).JPG

IMG_0609 (resized).JPG

IMG_0610 (resized).JPG

IMG_0613 (resized).JPG

#16 6 years ago

ZAZ

zaza

Pinside+ Frequent

Excellent ! well done
I see you have spare 2803 and 339's to repair a few more CPU boards : )

#17 6 years ago

DEN

Inactive member