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The ZCT1 Controller varies by Generations, this is Gen 3 out of 6 AKA the JDM-020.

L3 doesn't work

L3 doesn't pressing don't work

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crwdns2889612:0crwdne2889612:0 0
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Does the analog stick still make the click when you press it?

If it does, cleaning the joystick with contact cleaner may fix it.

If not the button is likely busted and the joystick module will need to be replaced. This does require a good amount of soldering skills and tools, but is doable at home with some patience!

DualShock 4 Left Analog Stick Replacement

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hoda rifae crwdns2934231:0crwdne2934231:0
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crwdns2936751:024crwdne2936751:0 0

crwdns2936753:07crwdne2936753:0 1

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