Hi, i'm getting no light or code, a service man came and suggested to replace the microcontroller board which i did. First, when i installed the board, i got the front panel to work, but when i tried to run it, it dies again. I thought i heard something poped. So, could the problem related to another board? thank you. Joey, Corona, Ca
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Re: GHW9150pw3 is dead
Most likely the interface panel(all the buttons and do dads)..there is more to interface than just buttons there are several electronic items there too besides i did the same thing and had to go back to change controls
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Check the fuse in the microwave it is probably open, unplug and remove the top, follow the leads from the keyboard to the circuit board, look for a silver rectangular capacitor, short out the two pins to remove any high voltage, now look for a small fuse that is clipped in, pop it out and check if open, replace with same current rating. The door switches in most cases cause the fuse to blow, normally one switch is defective.
What may have happened is that when you grabbed it, the pressure could have broken a trace (printed wire) on the printed circuit board in the keyboard. Usually the way a keyboard works is by making a matrix of switches where, for example, "a", "z", "q", "1", "`", and "tab" could be on one column and "z", "x", "c", etc are on one row. Pushing the "z" key makes a connection between the the corresponding row and column, and the keyboard's microcontroller interprets that as a keypress on the "z" key. If you've broken the connection to the "qaz" column, the microcontroller will never know that you've pressed one of those keys. Replacing the keyboard will give you a new microcontroller and circuit board, so you should be good to go!
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When a unit shows these symptoms it generally indicates that your unit has some sort of PSU fault, or a problem that is shutting down the Power Supply Unit, PSU. This happens so that no further damage, and possible fire will occur.
You need to take the unit to a reputable service centre/man and ask for a firm "Quote" for the work to be done.
No schematic found. The Q1 transistor is a 2N3904, D3 was replaced with a 1N4000 series.
Root cause still Unknown, but Q1 is an exact match and D3 is an acceptible replacement.
Hoovers solution is to replace the whole PCB no matter whats wrong with it, what a waste or good technology!
You probably have a sacrificial diode that blew out to save the rest of the monitor from further damage. The manufacturer should replace it with a refurbished one at little and sometimes no charge (comparatively speaking).
Sorry, But we don't take boards in to finx them without the sets. Thanks for asking and I am sorry I can't help in this one. A quick suggestion is to chack all the doides on the PS Board. I find that a dead diode is the major cause is a failure.
Ed ( Radio Man )