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Macintosh TV DIED after cuda swap

d3jsp

6502
Is the Cuda chip for the Macintosh TV same as an LC 475?

Had a working Macintosh TV with no ADB inputs, swapped for a 341S0788 from an LC 475 but will not power on at all. Power_on line on ADB is only ~2V when it should be ~5V.
Swapped back to original Cuda and still won't power on. Standby voltage ~5V is there on Power_on
What chip could I have killed during this swap?
 
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