LG MS2548GR Service Manual page 22

(TROUBLE 1) Oven lamp does not turn on when the timer knob is pushed with door closed.
1. Incomplete segments.
• Segment missing.
• Partial segment missing.
• Digit flickering (NOTE: Slight flickering is normal.)
2. Colon does not turn on or blink.
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 indicates a number different from one touched, for example, key in 5 and 3 appears in the display.
6. Specific numbers (for example 7 or 9) will not display when key pad is touched.
7. Display does not count down with time blinking or up with clock operation.
8. Display obviously jumps in time while counting down.
9. Display counts down too fast while cooking.
10. Each indicator light does not turn on after setting cooking cycle.
11. Display time of day does not reappear when cooking is finished.
12. Beep sound is not heard when correct key is touched.
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 pads.
5. Display is fixed
at some figure
and can not
accept any
input.
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Only for training and service purposes
CHECK
Check the conn-
ection between
membrane key
assembly and
PCB assembly.
Replace key
membrane
assembly and
check operation.
Still have trouble.
RESULT
Defective PCB
Continuity.
assembly.
Loose
No continuity.
connection.
Everything works
Defective key
as specified.
membrane
assembly.
Loose
connection.
5-12
CAUSE REMEDY
Replace PCB
assembly.
Connect them
tightly.
Replace key
membrane
assembly.
Replace PCB
assembly.
LGE Internal Use Only