I found the following thread using Google but found it difficult to reply so I copied the thread. It follows my message.
My GE microwave oven started acting up about 2 months ago. It has a Samsung microprocessor and this earlier thread seemed close. For seemingly no reason it would start emitting beeps every few seconds. I unplugged it, plugged it back in an it was okay. Then it stopped taking input from the keypad. Unplugging it didn't reset the microprocessor. I took it apart and after removing the circuit board and replacing it, then reassembling it, the oven worked okay for a few days. I thought it might be noise from a bug zapper, the noise having a slope so sharp it might have been mistaken for leaking rf. Wasn't it. I removed all the transistors and capacitors and they tested okay. Whenever I'd take it apart and reassemble it would work for a few days. I didn't want to peel off the keypad because I felt I couldn't return the peeled keypad without it looking pretty bad. I looked at replacement parts and ruled out buying parts. Finally I took the keypad off and exercised it bending it bending it back and forth on each axis. It peeled off nicely and I was surprised! When I returned it there was no visible evidence I had taken it off (but I was careful). The oven has been working flawlessly for weeks now. I suspect maybe I could have bumped into the keypad with something or possible just age, over 6 years old, but it's working perfectly. I'm happy.
Bill
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All messages from thread Message 1 in thread From: snipped-for-privacy@bellatlantic.net ( snipped-for-privacy@bellatlantic.net) Subject: samsung microwave
View this article only Newsgroups: sci.electronics.repair Date: 1997/07/22
I am looking for a place that sales Samsung microwave oven parts.
The part is a microwave oven door.
The model is Samsung MU3050W.
Is there anyone who can point me in the right direction so that I can get cooking again.
Thanks
jlwing
snipped-for-privacy@bellatlantic.net
-------------------==== Posted via Deja News ====-----------------------
View this article only Newsgroups: sci.electronics.repair Date: 2000/04/24
I have a Samsung Microwave (Model #: MW6470W) that the digital control is malfunctioning on. The display Works fine when first powered up (displays all segments, then SIMPLY SAMSUNG. The clock can be set, and numbers can be entered. All functions seem to be normal until a function is entered (at ANY time) which will cause the microwave to turn on, or the start button, at that point the keyboard freezes (can't change size of proportions, restart it after the door switch was activated, or anything with the keyboard). Basically, the microwave's keyboard will not respond to the next input. The relays operate properly and the display will count down properly when in cook mode (provided that the door switch was closed and was not opened), it will stop if the door switch is activated and ask to "press start". The relay(s) will shut down properly. The Magnetron transformer relay will cycle on and off according to duty cycle. What does not happen is that once a button that will cause the microwave to enter a cook cycle is pushed, even with all power wires disconnected and direct power to the control board relay, the keyboard's input does nothing - no beep, no functions, no start up after the door switch was activated and shut it off. Start does nothing (display keeps cycling push start). The beeper will beep reminding that the cycle is over or to push start, just that the key board has no input. The only way to get the keyboard to work properly is to reset the microprocessor by turning the power off or resetting it with the reset pin on the microprocessor.
The Microwave was in a flood, even before the original box was opened. It is possible that the microwave was plugged in before it was fully dried out, as when I acquired it, there was still water inside of the keyboard stickers (which I removed and cleaned). The rest of the microwave works fine. I have never seen the display working properly.
Also note that I do not have the instruction manual, and there may be something simple that I may be missing, but I doubt that ;-)
Thanks in advance for any help in getting this thing to work, as it is in new condition (with a few exceptions!), along with a void warranty,
Jeff Message 3 in thread From: Jerry G. ( snipped-for-privacy@hotmail.com) Subject: Re: Samsung Microwave
View this article only Newsgroups: sci.electronics.repair Date: 2000/04/23
By your description, this sounds like a fault on the microprocessor board. It can be any of the components in this area that is making it hang up. The most reliable and easiest fix is to change the complete board.