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snow bros no sound and little graphic issue


kthemall

Question

hi

 

got a snow bros toaplan board that has sound issues. first i thought it is the la4460n amp and changed it to a la4461n (mounted vice-versa) but still no sound. maybe the px4460 custom is completely dead. is there a possibility to "grab" sound elsewhere before that custom to be sure it is dead?

 

 

symptom 2 graphic issue:

 

IMG_20180703_182638.jpg

 

IMG_20180703_182635.jpg

 

on the right hand side some white stripes in between the pic and left top the player no. 1 not really visible. i thought it is one of the 4 rams 41464 but they seem ok (4 output lines have fine signal)

any hint where to check next? (btw. the eproms checked fine against romident)

 

thx tom

Edited by kthemall
attached 2nd pic
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