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World Rally board 1 repair log


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World Rally board 1

This board seams to have had a hard life a quick look over

Revealed eprom C23 missing and the corner broken off

The PCB through the mounting hole near I22.

Started by cleaning up the damaged board corner and repairing

A damaged track then burn a new eprom for C23.

Powering up showed some success well at least booted

Test screen showed test pattern but text was messed up

And not readable in game back ground ok text and car

Messed up sound consisted of just beeps and squawks.

More visual inspection revealed more damaged track

This time between D17 and F17 repairing these fixed the

Text and car graphics now for the sound suspecting the OKI

Chip and or mask rom I pulled the rom it verified ok

The board was shelved at this point to get some data

On the OKI chip and have a think about it this payed off

When I realised it was playing the correct sound track

Just too fast with most of the notes missing this

Lead to replacing the faulty 1Mhz ceramic resonator at C7

Board now working.

Not a bad game lots of fun and even works 2 player with

Joy sticks in a cocktail.

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