LG LMC1575BD Service Manual page 26

(TROUB LE 1) The following visual conditions indicate a probable defective control circuit.
1. Incomplete segments.
• Segment missing.
• Partial segment missing.
• Digit flickering (NOTE: Slight flickering is normal.)
2. Colon does not turn.
3. A distinct change in the brightness of one or more numbers in display.
4. One or more digits in the display are not lighting.
5. Display does not count down with time blinking or up with clock operation.
6. Display obviously jumps in time while counting down.
7. Display counts down too fast while cooking.
8. Display time of day does not reappear when cooking is finished.
Error Code Description : When the following Error Code displays, you can not use any button.
"F-3" Touch button Error Code
-If the main PCB can not receive any touch button signal, then Error F-3 is displayed.
CONDITION
1. No input can be
programmed.
2. Some inputs cannot be
programmed.
3. Display shows a number
or figure different from
one touched.
4. Random programming
when touching other
button.
5. Display is fixed at some
figure and can not
accept any input.
CHECK
Check the conn-ection
between Door assembly
harness and PCB
assembly.
Replace Door assembly
and check operation.
RESULT
Continuity.
No continuity.
Everything works as
specified.
Still have trouble.
5-14
CAUSE
1. Defective PCB assembly.
2. Defective Door harness.
Loose connection.
Defective Door assembly
Defective PCB assembly.
REMEDY
1. Replace PCB
assembly.
2. Replace Door
Connect them tightly.
Replace Door assembly
Replace PCB assembly.