LG MA748W 01 Service Manual - Page 23

I=Ineemplete seg ite • Segment missing. • Partial segment missing- • Digit flickering (NOTE: Slight flickering is normal.) Colon does not turn on or blink. 3. A distinct -thange-in--the-brightness of one or more numbers-in-display 4 One or more digits in the display of lighting 5. Display does not count down with time blinking crup-vvittrclock-operation. 6..Display obviously jumps-in time while counting down. i.Uisplay counts downlixtfEst while-cooking 8.Each indicator light does not turn =tier setting cuuknig cycle 9.Disptay time of day does not reappearwhen cooking is finished. 10.Beep sound is-not-heard when correct key is touched. CONDITION CHECK 1. No input - Pregfamme -ap- Check the cnnnection-between I ane key assembly and al!anz;Embly. . me inputs cannot be programmed. 3. Display shows a- number or figure different from one touched. Replace key membrane assembly and check opeia jui RESULT CAUSE Cur drnurlY. Poo i ui y. Defective PCB 1110- assembly. Loos connec run. Everything works as specified. Dcfcctivc kcy membrane assembly. Still have trouble --D. Defective PCB asembly 4. Random programming when touching r-- other pads. 5. Display is fixed at some figure and can not accept any input. REMEDY Replace PCB assembly. Connect them tightly. Rcplacc kcy membrane assembly. Replace PCB assembly. 5-12