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  1. P

    820-00840 / No boot / PP3V3_G3H Short to ground

    For sure. That’s why I ask for an evidence to test or doing. My Major problem is outputting on dual screens, which is not possible actually. With only 2 thunderbolts, and just one with video outpout, combinations are limited.
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Ok. So I suppose next thing to do is remove massive shield upper u2800 area and see if something is bad along j3300, like a protection diode or burn resistor right ?
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Suppose that i have already done that (tell me if it’s incorrect) when I found that d+ pin on bottom side of the u3100 linked usb-C port was at 0.042 in diode mode instead of O.L. on other ports. anything else I can check? Maybe U2800 involved in my issues?
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    820-00840 / No boot / PP3V3_G3H Short to ground

    So I have unsoldered redriver chip from the board. Symptoms are still the sames (working outpout monitor on u3100 linked usb-c port, nothing on u3200 linked, fully working usb détection, management and charging on u3200 linked port, only charging and Sometimes détection on u3100 linked port) a...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Ok thanks for all this explanations. all i know it's it is an oem charger an cable, but cable was partially ruined (needed to flex it in many ways to have signal on the board, that was done by previous owner. Can Suppose a voltage dropped to data line inside the cable) Since the beginning of my...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    For sure. But each chip is for a single port, no communication between them for theses lines, right? supposing I soldered a partially bad u3200 (u3100 is still the original) data line can make all my usb-c equipments to work but didn’t’ detect a monitor ?
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    820-00840 / No boot / PP3V3_G3H Short to ground

    So i removed Usb redriver chip for the moment. Can U3100 / 3200 be involved in my usb-c troubles ?
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Should I remove the redriver chip and see if it run better without? This chip is my major problem on this board, and is involved in all my issues since the beginning… assuming it’s not a Perfect way to leave the board without it, but with it it’s worse… Thunderbolt area looks fine.
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Ok thanks. So i tried the board on dual screen and usb-c dock. On first usb-c connector (U3200 link) no screen detected, but all things connected in usb-c (ethernet / USB / charger) is ok, in both sides On second usb-c connector (U3100 link) i have the output for the screen, and the video...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    That's what i did (isopropyl+toothbrush), but still have sticky flux on the board, unable to remove it only with toothbrush and isopropyl. Don't want to use pcb cleaner, already have a bad experience with it.
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Thanks for suggestion! So i removed redriver chip, low value still here (little bit high but still there) I decided to test the board without redriver, and all sides of all connectors works. So then i decided to solder a "new" Redriver chip (from my 5 units lot) with a different method (making...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Hum… i see. So if I resume, it’s a data line partially shorted. It Could be U3100, D3312 or replaced redriver chip, nothing more on the line. two options: continue investigating, or just use the machine like that. Is there a risk to use it with this short? (I mean plug-in a device and burn it)...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    0.042 on diode mode is a pure short to ground?
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Ok. I made a mistake, CC1 lines are top, CC2 bottom (regarding to schematic) So supposed faulty line is USBC_XA_USB_TOP_P, witch is equal to USBC_XA_USB_DBG_TOP_P On schematic, there is only one component on this line, D3312. This is that you call TVS diode? Only TVS Diodes called like this...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Ok thanks. No corrosion at all. USBC_XA_CC1 (Bottom-U3100 linked one) : 0.745 USBC_XA_CC1_CONN : 0.868 USBC_XA_CC2 (Top-U3100 linked one) : 0.751 USBC_XB_CC2_CONN : 0.866 USBC_XB_CC1 (Bottom-U3200 linked one) : 0.749 USBC_XB_CC1_CONN : 0.860 USBC_XB_CC2 (Top-U3200 linked one) : 0.763...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Hello again ! So i received my "news" CD3215C00 chips. Soldering one of them on U3200 and....it's definitively alive 19,94V and more than 1 Amp on each ports !!! Installing macosx, everthing works fine excepted a strange thing : When i'm connecting my usb-c cable on first port (U3200 linked)...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Thanks for your reply. I made a mistake with board in computer, trying to see if everything was working fine (screen/battery etc) Plugged on second port (linked to U3100) everything was fine (charging-aht-screen…). Unfortunately, i have unplugged from this port and replugged on the other port...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Ok thanks. It's really strange that the board works well on this port 2 days ago, juste before i solder PI3USB32224BXEAE, and now this port looks killed don't you think ? A reflow on CD3215 is possible or it doesn't do nothing more ? Taken voltages on U3200 to be sure : PP3V3_UPC_XB_LDO ...
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    820-00840 / No boot / PP3V3_G3H Short to ground

    Q3200 voltages => PP20V_USBC_XB_VBUS_F : 5,24 v PPDCIN_G3H : 0,12 v UPC_XB_GATE1 : 1,54 v UPC_XB_GATE2 : 5,03 v
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