dear fellow tech enthusiasts, I would appreciate your help ! I have an 820-00850 here that died on a squeezed/shorted charging cable.
I found several shorted ldo's on both U3100 and U3200. I replaced them with cd3215c00 ( originally c00Z )
D3301 was shorted, removed without replacement for now. No other visual / obvious findings. ports look good.
4,86V / 0,23A on usbc meter and ppbus 12.28V, ppdcin_g3h 5V and pp3v3_g3h 3.3V - all ports/orientation. Nothing obvious on a thermal picture, only t2 warms up to 35Celsius.
1V1 LDO missing on u31/32 ! all other LDOs present on all ACEs.
PP3V3_UPC_XB LDO and _TA LDO are present at U2890 / UB090
(Only when charger connected to the corresponding port/orientation (just one at a time)):
pp1v1_upc_xa_ldo_bmc - 0V
pp1v1_upc_xb_ldo_bmc - 0V
pp1v1_upc_ta_ldo_bmc - 1.1V
pp1v1_upc_tb_ldo_bmc - 1.1V
usb CC around 1.75V ( of which each time 6(7) do oscilate)
-
few diode mode readings:
pp1v1 ldo'S - all four around 0.47
pp20v_usbc_xa_vbus - 0.17
pp20v_usbc_xb_vbus - 0.13
pp20v_usbc_ta_vbus - 0.17
pp20v_usbc_tb_vbus - 0.13
this seems not ok to me. Am wondering if I should remove other diodes on pp20V lines, doubt the new or even the 2 left original cd3215 or if I should think about the tbt rom next. I am unsure what steps to take best next.
I found several shorted ldo's on both U3100 and U3200. I replaced them with cd3215c00 ( originally c00Z )
D3301 was shorted, removed without replacement for now. No other visual / obvious findings. ports look good.
4,86V / 0,23A on usbc meter and ppbus 12.28V, ppdcin_g3h 5V and pp3v3_g3h 3.3V - all ports/orientation. Nothing obvious on a thermal picture, only t2 warms up to 35Celsius.
1V1 LDO missing on u31/32 ! all other LDOs present on all ACEs.
PP3V3_UPC_XB LDO and _TA LDO are present at U2890 / UB090
(Only when charger connected to the corresponding port/orientation (just one at a time)):
pp1v1_upc_xa_ldo_bmc - 0V
pp1v1_upc_xb_ldo_bmc - 0V
pp1v1_upc_ta_ldo_bmc - 1.1V
pp1v1_upc_tb_ldo_bmc - 1.1V
usb CC around 1.75V ( of which each time 6(7) do oscilate)
-
few diode mode readings:
pp1v1 ldo'S - all four around 0.47
pp20v_usbc_xa_vbus - 0.17
pp20v_usbc_xb_vbus - 0.13
pp20v_usbc_ta_vbus - 0.17
pp20v_usbc_tb_vbus - 0.13
this seems not ok to me. Am wondering if I should remove other diodes on pp20V lines, doubt the new or even the 2 left original cd3215 or if I should think about the tbt rom next. I am unsure what steps to take best next.
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