LG RCS10MPA Service Manual - Page 30

(TROUBLE 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 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. 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. CHECK Check the connection between membrane key assembly and PCB assembly. Replace key membrane assembly and check operation. RESULT Continuity No continuity Everything works as specified. Still have trouble. CAUSE Defective PCB assembly. Loose connection. Defective key membrane assembly. Defective PCB assembly. REMEDY Replace PCB assembly. Connect them tightly. Replace key membrane assembly. Replace PCB assembly. 5-12