LG LS-B0760CM/B0760HM Service Manual page 55

Possible Trouble 5
Does 4-way operate?
YES
Check Voltage of IC8 1pin
(DC 5V?)
YES
Check Voltage of IC8
16pin (0V?)
YES
Check the RY-4way and
4way VALVE
Possible Trouble 6
Is the F/PO key OK?
YES
P.C.B pattern Check
: Ineffective Heating
NO
NO
NO
: It does not operate forced operation.
NO
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Check and Exchange
IC3, RY1
Check P.C.B pattern
(to IC1 42pin)
Check and Exchange IC8
Exchange the F/OP key