Build Your Own Arcade Controls Forum

Arcade Collecting => Restorations & repair => Topic started by: thk on August 15, 2014, 11:37:07 am

Title: Is this bad? Can't tell if these are fried????
Post by: thk on August 15, 2014, 11:37:07 am
Ok so I am trying to get a multimeter because I know that will probably help me but can someone tell me if these things are fried or what? I have attached the pics below of my galaga bootleg that I am trying to fix. Thanks


(http://s12.postimg.org/9u4yvskbx/2014081595094123.jpg)

(http://s13.postimg.org/x1ved7f1z/2014081595094209.jpg)

(http://s2.postimg.org/sryf1z4nd/2014081595094305.jpg)

(http://s17.postimg.org/xo16efwdr/2014081595094412.jpg)

(http://s27.postimg.org/hda93jccz/2014081595094848.jpg)
Title: Re: Is this bad? Can't tell if these are fried????
Post by: sollyscomputers on August 15, 2014, 04:52:09 pm
If you're asking whether the electrolytic capacitors are fried, they usually 'pop' or bulge on the top when they blow but not always true.  Only way is to use a capacitence meter (these days most multimeters have them) and check them.  I recommend removing them from the board before you test to get an accurate reading as if you test while in circuit, other components may change the caps value

Hope this helped abit
Title: Re: Is this bad? Can't tell if these are fried????
Post by: Slippyblade on August 15, 2014, 05:43:14 pm
I'm gonna go out on a limb here and say the one that is missing half the component is probably no good.   :applaud:
Title: Re: Is this bad? Can't tell if these are fried????
Post by: thk on August 15, 2014, 09:15:18 pm
Quote from: Slippyblade on August 15, 2014, 05:43:14 pm
I'm gonna go out on a limb here and say the one that is missing half the component is probably no good.   :applaud:

Ok last question then...

Would this cause the game to not boot? The transistor?
Title: Re: Is this bad? Can't tell if these are fried????
Post by: Slippyblade on August 15, 2014, 09:20:38 pm
That busted piece is a capacitor, not a transistor.  Sorry, not sure about how it would affect boot process.
Title: Re: Is this bad? Can't tell if these are fried????
Post by: ed12 on August 15, 2014, 09:57:48 pm
the 104k/j is a buss by-pass cap..no biggie right now
just remove it for now..the buss will live
the other's :electrolytic's: shear age say's replace them
1981/2 is when that board came out
thats a boat load of time ago...there aged and old

ed
Title: Re: Is this bad? Can't tell if these are fried????
Post by: matsadona on August 27, 2014, 04:48:54 am
Quote from: Slippyblade on August 15, 2014, 05:43:14 pm
I'm gonna go out on a limb here and say the one that is missing half the component is probably no good.   :applaud:
I second that  ;D

As stated by others, that obviously broken capacitor is not a critical part, however it might cause "glitches" when missing.

Here you can find more information about this topic:
http://www.brighthubengineering.com/diy-electronics-devices/56501-how-to-decouple-a-logic-circuit/ (http://www.brighthubengineering.com/diy-electronics-devices/56501-how-to-decouple-a-logic-circuit/)