MY Sharp R-340D unit is about 3 years old. It worked perfectly until about a month ago when the Control Panel screen went blank. When I unplugged the unit and plugged it back in, the screen returned and the unit worked flawlessly again.
Now, I lose the screen every day. When the screen goes blank so does its touch sensitivity, meaning there's no response when I touch the screen. To get the unit to work, I have to unplug it and plug it in again. The screen stays on for about 1/2 a day and the unit works perfectly and then the screen goes blank again.
It seems like an odd problem. Is it the control panel? Is is a shielding problem? Is it something else? Can I replace the control panel myself? I repair computers. How would I find the part number and where would I buy it?
Thanks for your help.
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Yes this is usually caused by the touch assy, but $278 !!!!! Thats kinda steep considering the panel assy is only around 30-60 bucks!!!
It will need the touch assy and even possibly the control board, because sometimes the logic IC gets fried and causes "ghost issues" as well.
Waleed, Since the microwave is going through all its motions we can feel safe that the oven and magnetron thermostats are ok. If they were bad you would not have a display. Just inside the control panel to the left, you have 3 switches which the door activates. A primary (top switch) a secondary (bottom switch) and a monitor switch (middle). If the primary or secondary switch is not closing when the door is shut, you high voltage side will not activate, therefore no heat. If the monitor switch failed or found either the primary or secondary switch closed with the door open, it would blow the main fuse and the oven would be dead. Therefore Im leaning on either the primary or secondary switch not operating correctly. When checking these switches, unplug and discharge the capacitor. This is high voltage. Good luck