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Author Topic: 1697 controller - What is U4 on MCU Board (top)?  (Read 588 times)

Offline toddby

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1697 controller - What is U4 on MCU Board (top)?
« on: January 02, 2023, 09:38:03 PM »
I was cleaning some corrosion & gunk from a 1697 controller MCU Board and removed resistors R17 to R20 near the left thumbstick. It looks like this circuit is related to the rumble motors and replicated on the right so I can get values for the 4 missing resistors by measuring R25 to R28 (I'm guessing they're the same as the left side. OK?)

However, U4 (on the MCU Board) looks a bit corroded as well so that might need to be replaced. U4 and U5 are marked "455 10" but I haven't found anything after a Google search.

Can anyone identify U4 on the top of the MCU Board?
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Offline RDC

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Re: 1697 controller - What is U4 on MCU Board (top)?
« Reply #1 on: January 03, 2023, 04:01:42 AM »
U4/U5 are A3910. They have the same Resistor values in both circuits.
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Offline toddby

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Re: 1697 controller - What is U4 on MCU Board (top)?
« Reply #2 on: January 30, 2023, 02:20:02 PM »
Thanks!
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Offline RDC

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Re: 1697 controller - What is U4 on MCU Board (top)?
« Reply #3 on: January 30, 2023, 02:56:28 PM »
Welcome.
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