Microwave works; LCD touch screen is all gray/blank
If I leave the microwave unplugged for 24 hours the touch screen will work for about another 24 hours and then it "grays" out. The microwave still works (I can remember where the buttons are supposed to be) but is useless without being able to see the screen. Any help you can provide is much appreciated.
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Hi Ben, This has got to be an intermittent power to the control PCB problem. The control board asking to set the clock means that the CPU has been reset by losing power. First, make sure that the problem is not the outlet by plugging in a small lamp or digital clock to see if it works intermittently or resets. Leave it plugged in for at least 24 hours. (If using a lamp, put in a small 20 watt light bulb or CFL). It could also be a bad connection to or at the fuse holder in the microwave oven. If all of the wiring and connections look good, it's most likely a bad connection on the control PCB probably around the transformer on the board. Be careful.......
You can set the clock to a 12 or 24 hour system.
For 12 hour -
Touch clock pad once
Enter the time using the number digits (1:00-12:59)
Touch clock pad again
For 24 hour -
Touch clock pad twice
Enter the time using the number digits (0:00-23:59)
Touch clock pad again
On most recent Sharp microwaves, the fuse only interrupts main power, so if the fuse is blown, it will be totally dead.
first thing I would suggest is a hard
reset. Unplug the unit for a
minute or so. Then plug it back in, set the clock and try again.
If that doesn't work,
leave it unplugged for about 5 minutes then try it.
Then chances are you have a failed microwave display. Unless this is an over the range, touch screen, or convection type, it's probably not worth repair, but you can get more information on such repairs here.
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.
ut the tech sheet did mention that intermittent F7 problems are usually caused by poor connections. So I pulled the ribbon connector off the control board and cleaned the copper connectors using a pink pencil eraser. That whupped that puppy!
But then I went out on another service call, same oven, different house. The pink pencil eraser trick didn't work on this one so I had to apply some of that famous Samurai gray matter. To identify the problem on this one, I cut power to the range and disconnected the ribbon connector that connected the touch pad to the electronic range control (ERC) board. Then I re-applied power and let it sit that way for 24 hours after which the customer was instructed to call me and report on the error code status of the oven. If no error code was reported, I knew the touch pad was the problem. If, on the other hand, the F7 error code came back, then I knew the (ERC) was the culprit. In this case, the error code did not come back during the test period and, using my keen, Vulcan-like powers of deduction, concluded that the touch pad was defective. I replaced the touch pad and problem solved!