LG MH2044DB Service Manual page 26

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run
(Display operates properly)
CONDITION
No microwave
oscillation.
(TROUBLE 6) Oven seems to be operation but no heat is produced in Micro Mode.
CONDITION CONDITION
No Output
in Micro-mode
CHECK
Disconnect the
wire leads from
relay 2 and
check continuity
of relay2.
(Operate the
unit)
Check H.V.
transformer.
Check H.V.
capacitor.
Check H.V.
diode.
Check
Magnetron.
CHECK CHECK
Check HV Fuse
RESULT
No continuity.
Continuity.
Abnormal
normal
Abnormal
normal
Abnormal
normal
Abnormal
RESULT RESULT
Open
5-16
CAUSE
Defective P.C.B
assembly
Defective high
voltage
transformer.
Defective high
voltage capacitor.
Defective high
voltage Diode.
Defective
magnetron.
CAUSE CAUSE
HVD, HVC
or MGT NG
REMEDY
Replace P.C.B
assembly
Replace high
voltage
transformer .
Replace high
voltage capacitor.
Replace high
voltage Diode.
Replace
magnetron .
REMEDY REMEDY
First Replace
Defective part
MGT/HVC/HVD
and then replace
HV Fuse