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Main => Main Forum => Topic started by: Swatwolf on November 06, 2007, 12:23:42 pm

Title: Question about if this is a fried PCB or not
Post by: Swatwolf on November 06, 2007, 12:23:42 pm

Hi all.  I recently came across a Donkey Kong Junior Cab that needed a good home.  I resuced it from going to the dump and decided to not mame it and try my hands at a restoration.  The problem that I am having is I repaired the wiring and got the cabinet to power up, but there is of course a problem. I was hoping if anyone in here knows if this picture means that the PCB is bad or something else wrong in what I am doing.  Any and all help is of course appricated in advance.

Title: Re: Question about if this is a fried PCB or not
Post by: BrentRadio on November 06, 2007, 12:26:00 pm

That does not look fried, it looks baked...

 ;D

Brent

Title: Re: Question about if this is a fried PCB or not
Post by: Swatwolf on November 06, 2007, 12:27:52 pm

hehe I prefer deep fat fried but baked is also a good flavor

:cheers:

Title: Re: Question about if this is a fried PCB or not
Post by: BobA on November 06, 2007, 12:32:04 pm

The fact that you got something to display is a good sign.  The board may have a problem with its video proms or a dirty or loose connector between boards.  Connectors are a very common problem.   Also make sure your voltages are at the proper value.  eg make sure you have 5.0V not 4.7V

Title: Re: Question about if this is a fried PCB or not
Post by: Swatwolf on November 06, 2007, 12:42:55 pm

Ok time to show my noobish-ness.  I think without too much problem I can check all the connectors and such to make sure it is all working.  Not sure on the voltage checking, the power supply seem to be originals and came with the cab, all I had to do for wiring was replace the cable to the monitor and the cable to the power supply.

I know pc's real well but all that wiring to me is whoosh  over my head.  :banghead:


Also now I just found the wiki on restorations and reading up there...... :applaud:

Title: Re: Question about if this is a fried PCB or not
Post by: BobA on November 06, 2007, 12:53:09 pm

See the How to use a Multimeter to Troubleshoot sticky thread.

Link (http://forum.arcadecontrols.com/index.php?topic=68787.0)

Title: Re: Question about if this is a fried PCB or not
Post by: knave on November 06, 2007, 01:03:01 pm

I'm just a fellow noob but the first thought I had upon seeing your screen is that it's a startup screen and just frozen.  It doesn't scream fried (or baked) to me.  Just stuck.

I second the multimeter thread. I also reccomend reading up on your specific game board, there might be some troubleshooting tips in the manual and for some games you can even find the schematic.

Next I would gently reseat all the IC's and Roms (just press them to be sure they're in place.)

Title: Re: Question about if this is a fried PCB or not
Post by: Level42 on November 06, 2007, 05:22:21 pm

1) Is that screen completely static ?
2) Is there a reset button on the PCB set, and if so did you try it ? Does anything change then ?

If 1=yes and 2=no, check out the reset line on the CPU (Z80 I think). If it's low, for some reason, the CPU is constantly reset = frozen. I had the same thing with my Centipede.