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| Any idea what this IC is? |
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| Rick Law:
Trying to identify an unknown IC. This is on the "user interface" board of a dish washer. The ruler scale is cm. I suspect this is the MCU. Searching the markings "7082zb0b rf2135cmn" found nothing. Thanks |
| NiHaoMike:
The part number format appears to be Renesas. If you can't find documentation on their site, it might be customized for the appliance or appliance subassembly manufacturer. |
| T3sl4co1l:
You forgot the 5 :) https://pdf1.alldatasheet.com/datasheet-pdf/view/683718/RENESAS/R5F2135CMNFP.html R8 looks... broadly comparable to MSP430, say, midway between AVR and ARM? Looks to be a Flash model so it should be reprogrammable, if you so dare; is probably locked by the factory so you can't download it, at least not trivially (but there are often bugs that can be abused to read out program data. Or if it's completely toast... just get a new board, you'll need a new one anyway to copy the firmware from (if you can copy it at all). Tim |
| Rick Law:
--- Quote from: T3sl4co1l on October 10, 2020, 10:07:26 pm ---You forgot the 5 :) https://pdf1.alldatasheet.com/datasheet-pdf/view/683718/RENESAS/R5F2135CMNFP.html R8 looks... broadly comparable to MSP430, say, midway between AVR and ARM? Looks to be a Flash model so it should be reprogrammable, if you so dare; is probably locked by the factory so you can't download it, at least not trivially (but there are often bugs that can be abused to read out program data. Or if it's completely toast... just get a new board, you'll need a new one anyway to copy the firmware from (if you can copy it at all). Tim --- End quote --- Geez! I did missed a 5. I did my search by typing that with notepad first, and copied/pasted different combinations to search. Of course, every time I searched by pasting, I missed that damn 5. I was suspecting it may be the MCU, thanks for the confirmation. I purchased and installed a new board from the manufacturer already. So that dishwasher has risen from the dead for about a week now. But in my initial research into the problem, that user interface board appears to be the "frequent failure" module. So post repair I was studying the bad one to see if I found anything interesting. Finding out what MCU is more to satisfy a curiosity. I know an MCU failure will require firmware that I won't have. Had I observed some other obvious failure, I would try to repair this failed board as a stand-by for next time since this is the "frequent failure" module. But I saw nothing obvious on it. I was hoping to see a blown fuse on the board or something simple like that, but no such luck... |
| magic:
Capacitors and voltage regulators? |
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