Berzerk trouble

scaboo4u

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Donor 2011, 2013
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Need some help. Reseated chips. Same
swapped boards same
checked voltage good
battery meters 4 volts
power up i get 1 beep and 1 flash on led
carpet looking screen
that's it
oh yea
press reset 1 beep 1 flash
help
 
Sounds like the cables that connect the pcbs. Have they been replaced before? IF so, is there an extra pin on the cable?

Seen that a few times, did it myself too.

Just a thought...
 
The battery should have nothing to do with the rug pattern screen.
However, should be 3.6v, so not sure how 4v is happening...
 
Sounds like the cables that connect the pcbs. Have they been replaced before? IF so, is there an extra pin on the cable?

Seen that a few times, did it myself too.

Just a thought...

Nope... first 3 flashes are ZPU only... don't need the cables or any of the other boards hooked up to get the first 3 if the ZPU's good.
 
Mmmmm, I don't know for sure what might be causing this. But on pg. 15 of the manual it gives you a list of possible issues if your machine stops at the first test & if your LED stays on or goes off. This might give you some ideas.
Hope this helps. Take care,
-Dave
 
Check....

Disconnect everything but the ZPU....see what you get in terms of flashes and beeps. If less than 3/3....try cleaning up and re-seating the Z-80 and make sure it is getting the correct voltage. See if pin 26 is cycling from low to high upon power up. If voltage supplying to the Z-80 looks good then check the reset line for corrosion damage - you need that line to cycle from low to high when you power up. Once you have 3 beeps and 3 flashes...then plug additional boards in and go from there. Probably should replace the inter-connect cables and clean up the header pins before diving into the other boards....

Good luck with your repairs....
 
Ok update on this pos
got 7 flashes no beeps
changed sound board things get worse
solid led
changed back solid led wtf is this
had to quit for today
how do you test z80s
i got 3 flashes with 1
7 flashes with 1
now i get nothing with all 4
any ideas OH YEA WHEN IGOT 7 FLASHES NO SOUND I GOT CREDITS AND GAME PLAY FIRST SCREEN WAS FINE SECOND HAD INVISIBLE ROBOTS STILL NO SOUND
THEN EVERYTHING WENT TO SHIT
UP TO THIS POST GOT A LOT OF HELP. I WAS ALMOST THERE NOW WHAT.
 
Last edited:
Ok update on this pos
got 7 flashes no beeps
changed sound board things get worse
solid led
changed back solid led wtf is this
had to quit for today
how do you test z80s
i got 3 flashes with 1
7 flashes with 1
now i get nothing with all 4
any ideas OH YEA WHEN IGOT 7 FLASHES NO SOUND I GOT CREDITS AND GAME PLAY FIRST SCREEN WAS FINE SECOND HAD INVISIBLE ROBOTS STILL NO SOUND
THEN EVERYTHING WENT TO SHIT
UP TO THIS POST GOT A LOT OF HELP. I WAS ALMOST THERE NOW WHAT.

That randomness in results sound like the Z-80 socket could be bad. Have you popped the black part of the socket off the board to see if you have corrosion or broken pins? You have to gently pry it up from both ends to keep from damaging it.
 
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