Re: Lighted LCD microwave display is intermittent

Makull <makull1@xxxxxxxxxxxxxxxx> writes:

Our Sharp built in microwave, model no. R-420DK, hasn't had a LCD
display that was easily visible (especially at night) since we bought
the house 3 months ago. The light for the display came on yesterday
and today while we were using the touch pad. The light stayed on for 5
or 6 seconds each time and went out when we opened the door or punched
another button on the touch pad.
I'd like to try to troubleshoot and repair the LCD light circuit, and
need info on safely accessing the lighting circuit.

Someone else basically said to buy a new oven. That's ridiculous.
This could be a simple bad connection to the backlight.

But you do need to have some electronics experience to find it and
understand that there may be very lethal voltages present once you remove
the cover of the microwave. The controller PCB and backlight are nowhere
near the microwave high voltage supply but it will be exposed. However,
there will still be line voltage on the controller PCB.

What is your level of electronics expertise?

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.


.

Quantcast