Samsung NZ64F3NM1AB Service Manual page 27

4-3 Electrical Malfunction
Connect the display board to the
Power board properly.
Connect the display board
Yes
to a test Power board.
Restart the unit, does the
symptom continue?
The Power board is damaged.
Replace the Power board.
Replace the Power board and
the display board.
Heating zones of the same side would display "U"
No
Yes
No
Perform the operation again and check if
it is working properly.
Check the connection.
Yes
Connect a test display board to
the Power board. Restart the unit,
does the symptom continue?
No
The display board is damaged.
Replace the display board.
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: Check if the Power board and the
display board are connected properly?
: Test board, means a normal
display board or a normal Power
board.