(Topic ID: 174433)

RoadShow needs some Pinside magic (fried ICs at matrix?)

By waffen_spain

7 years ago


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#2 7 years ago

On the schematic, follow the pins that do nothing in your test - they should travel back to an LM339 which is likely fried.

Don't try to desolder the LM339 - cut its legs and remove them one by one. Clean out the holes and fit a socket.

Play the game

#4 7 years ago

There are 4 x LM339 - two each side of the ULN2803 you have replaced. The five chips are almost in a row.

#8 7 years ago

Different brand and so a different prefix

ScreenHunter_180 Nov. 26 08.26 (resized).jpgScreenHunter_180 Nov. 26 08.26 (resized).jpg

#9 7 years ago

You can use your meter to investigate what happens at the outputs of each buffer as you trigger the corresponding input

The ones you are interested in are the second two chips on that schematic. The first two are for direct inputs and the last ones are the ULN outputs to drive the switch matrix.

#13 7 years ago

Don't do random things. Work through the circuit logically. Pick one of the inputs that isn't working as it should, identify the section of the 339 that it connects to, measure at the input and output of that buffer and make sure it changes. If it doesn't change when it should - there is your problem.

This does get more complicated as some chips are interconnected and this becomes more complex to fault find with a simple meter.

Be careful changing chips as these tracks are VERY fragile and you can cause more trouble than you already have by fiddling around here.

Perhaps it's time to send the board out to someone for a professional repair?

#16 7 years ago

Does this board have any battery damage from leakage?

#19 7 years ago

http://pinwiki.com/wiki/index.php?title=Williams_WPC

From the above link:

"To prevent simple removal of the PIC, the device also controlled the switch matrix, and would not operate without a correct machine code from the WPC CPU. Therefore, there is one PIC for each machine. An incorrect or defective chip will result in a "G13 error" or "U22 error" at startup."

#30 7 years ago

What has happened here that so many tracks are broken or missing? This is certainly very unusual?

Were the tracks damaged pulling out the IC's or some other event?

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