Donkey Kong Junior Board Repair

ScumBum

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I don't know anything about board repair but looking here http://www.mikesarcade.com/arcade/repairs/dkjr.html I think I found the problem with the sound on my DK Jr ,

Problem: Music constantly playing same tune.

Solution: Bad 74LS174 @ 3D

Mikes arcade has them ,

is there any soldering involved or can I just swap these chips to see if it fixes the sound problem ?
 
there is soldering involved, but it is not that bad.

So , you think I should attempt it ? I've only worked on monitors , cap kits and such ......

Any words of wisdom to help me with my first board repair ?

What type of solder ?
 
sure, if you have done cap kits, you can replace a chip. desoldering the chip is the only tricky part. get a good solder sucker or a desoldering iron and you will be fine.

when I first signed up here two years ago, the first advice I got in fixing my dkjr board was to replace the 40 pin cpu socket. I hated soldering back then. now I can't wait for the next cap kit.
 
So , you think I should attempt it ? I've only worked on monitors , cap kits and such ......

Any words of wisdom to help me with my first board repair ?

What type of solder ?

see if your local electronics store has those ... much cheaper unless you intend to order something else from mikesarcade.com ...

before soldering it, try piggy backing the chip on top of the suspected bad ic ....
 
see if your local electronics store has those ... much cheaper unless you intend to order something else from mikesarcade.com ...

before soldering it, try piggy backing the chip on top of the suspected bad ic ....

piggy backing , you me put the new chip on top of the suspected bad chip so the pins touch each other and this will put the new chip in the circuit ?
 
bring over the board, I'll swap the chip for you. We can test in my DK.

John
 
for bad chips, I snip all the legs as close to the chip as possible. Then I remove each leg. I then put in a socket just in case... :)
 
Eh... get a soldapullt, learn the technique on a scrap board, use a good iron, and pull entire chips out w/o destroying them...

Usually the ones I'm pulling I've either verified are bad through use of my logic probe. Either that there's a very high probability it's bad through other debug etc.
 
I often find that snipping makes the pins harder to remove since the pins get deformed, and unless you have really good snippers, you'll occasionally slip and nick the board...

I agree... good snippers are a must. the ones I have will cut the pins flush with the chip casing without touching the board.
 
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