Hi, I have a MacBook Pro A1706 820-00239 which was at 5V 0.4A on a single port (the other wasn’t turning on the usb c tester), I looked at the thermal camera and a CD3215 was heating up so I replaced it, I'd managed to get 20V but when I reassembled it my usb c tester didn't light up on any port, I tried the card again on its own it no longer takes the load and doesn't light up on any port. What should I try?
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A1706 MacBook Pro No power
- Thread starter Giuliongo
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First of all, welcome to the forum!
Check diode mode to ground around CD3215 chips; especially their LDOs.
Also check on CC1/2 lines.
Remove USB-C connectors from case and inspect their terminals for corrosion.
Check diode mode to ground around CD3215 chips; especially their LDOs.
Also check on CC1/2 lines.
Remove USB-C connectors from case and inspect their terminals for corrosion.
I found a CC on USB_UPC_XA_P at 0.2 Ohms, USB_UPC_XA_N at 0.2 Ohms, USB_UPC_XB_P at 0.4 Ohms, USB_UPC_XB_N at 0.2 Ohms, USB_UPC_TA_N at 0.1 Ohms, USB_UPC_TA_P at 0.1 Ohms, USB_UPC_TB_N at 0.1 Ohms, USB_UPC_TB_P at 0.1 Ohms. That's why none of the ports are working I thinks. But it is really many line, what's the next step ? I also found at USBC_XB_CC2 but it is at 4.2 Ohms, USBC_TA_CC2 at 3.8 Ohms.
The USB-C connectors are OK because I already tested switching the two to verify that they have the same operating. Visually there are OK.
"is really many line, what's the next step ?"
Next step, check and understand schematic!
All mentioned lines are tied to ground through 0 ohm resistors.
Your problem resides on CC lines shorted to ground.
"USBC_XB_CC2 but it is at 4.2 Ohms, USBC_TA_CC2 at 3.8 Ohms"
You may have a fake charger, which damaged all ports.
BTW, write directly into bottom reply box, instead of clicking Reply button.
Next step, check and understand schematic!
All mentioned lines are tied to ground through 0 ohm resistors.
Your problem resides on CC lines shorted to ground.
"USBC_XB_CC2 but it is at 4.2 Ohms, USBC_TA_CC2 at 3.8 Ohms"
You may have a fake charger, which damaged all ports.
BTW, write directly into bottom reply box, instead of clicking Reply button.
Check CC1/2 lines on the 4 ports.
CD3215 chips are the first suspects.
Still possible to have damaged ESD diodes; DZB551/2, etc...
CD3215 chips are the first suspects.
Still possible to have damaged ESD diodes; DZB551/2, etc...