There are 3 large ribbon cables that run from the main board to the print carriage board. With the MAIN power off, unplug one cable at a time and tape off then see if it power up. Try each one individually until you find the culprit. Make sure the main power is off, or printer unplugged before disconnecting any cables. It’s going to be one of those 3 cables that is bad. Happens more often than not.
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