Neff H7871. Replaced part numbers: 268692 (module power) and 268690 (display module). There is AC power to the unit but the unit appears 'dead' with no display lights. Does anyone have a wiring diagram or ideas on how to fix it please?
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Re: Power but no display to unit
Not sure about the Neff brand, but in general you'd want to check for 110VAC power on the primary side of the low voltage transformer on the control panel / board.
If that is present, check the secondary for voltage, about 12-30VAC. If the unit has a VFD type display, there will be a heater filament supply, usually around 2.5-6VAC. Also look for bad connecitons on the VFD.
If those voltages are present, check connections on the board, look for bloated / bulging capacitors, shorted diodes, breaks in the board, etc.
Also look for thermal cutouts and thermostats.
If this doesn't fix it, can you take several photos of the inner parts and circuit boards?
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The door latch is either cracked or broken.The door when gets closed the door latches clicks.But if the door latch is loose or cracked it will not click and door will not close.The door needs to be disassembled and the door latch has to be replaced, if the latch is cracked.Also to check the latch from inside the door needs to be removed.--------
This will help.thanks.Helpmech.
The bulb is positioned at the top of the oven, accessible only from the outside.
You'll need to pull off the top and bottom trim strips, remove the bottom trim strip locators, remove 2 fixing screws from the left edge of the oven (with door open), and the 2 fixing screws from behind the top trim strip.
The oven should then just slide out.
You only need to pull it out 6 inches or so to gain access to the bulb cover.
You'll need a T20 driver to remove the cover, then the bulb unscrews as it has an SES fitting.
If the diode failed by opening, there may be no other damage. If the dioded failed by shorting, the alternating current may have damaged other components. Ohm it out. You can get diodes from digikey.com, mouser.com, or radio shack or any electronics or appliance supply. If the diode is charred and you can't get the part number, the oven rating can be used to select a replacement. Since the fuse was 10 amps, the diode should also handle at least 10 amps. If you can power the unit and read the voltage at the diode input this will give you the power (volts times amps). It's always worth trying as it's cheaper than replacing the unit.
It would seem there is a bad connection in the fuse holder or in the wall socket or in the microwave itself.
Maybe you can narrow it down to the microwave by trying other devices in the wall socket.
If it's the microwave, it's time to call for serivce.