Hi All,
I'm working on a case for data recovery of an A1708 board 820-00840
when I received the board it was doing absolutely nothing. I took some pictures of the corrosion and ultrasonically cleaned the board. this revealed some problem areas.
no power via USB-C (stays at 5v 0mA, other port 5v 50mA)
PP3V3_GH, repaired the circuit and now 3,4v present
both CD3215 replaced, PPDCIN_3GH present at Q7030 (usb 5v 10mA)
I did not trust the U7000 (weird impedance at Aux_det) so replaced it
now Aux det is 1,2v and R7015, R7016 measure ok.
now I get 5v and 40mA cycling at both USB ports, but ISL still don't want to generate PPBUS
when I supply power to the battery terminal, (7v5) it takes 15mA and I measure this voltage also at F7000
SMS_RESET_R_L = 3,4v at R7072
PM_EN_P3V3_GH = 5v at R6999
SMC_AUX_OK = 3,4v at R7071
PP3V3_3GH_UPC = 3v3 at C3100 and C3200
I read something about ISL92 that it should generate 12v3 at L7030, there is currently only ~200mv
Any clues where to look for?
I'm working on a case for data recovery of an A1708 board 820-00840
when I received the board it was doing absolutely nothing. I took some pictures of the corrosion and ultrasonically cleaned the board. this revealed some problem areas.
no power via USB-C (stays at 5v 0mA, other port 5v 50mA)
PP3V3_GH, repaired the circuit and now 3,4v present
both CD3215 replaced, PPDCIN_3GH present at Q7030 (usb 5v 10mA)
I did not trust the U7000 (weird impedance at Aux_det) so replaced it
now Aux det is 1,2v and R7015, R7016 measure ok.
now I get 5v and 40mA cycling at both USB ports, but ISL still don't want to generate PPBUS
when I supply power to the battery terminal, (7v5) it takes 15mA and I measure this voltage also at F7000
SMS_RESET_R_L = 3,4v at R7072
PM_EN_P3V3_GH = 5v at R6999
SMC_AUX_OK = 3,4v at R7071
PP3V3_3GH_UPC = 3v3 at C3100 and C3200
I read something about ISL92 that it should generate 12v3 at L7030, there is currently only ~200mv
Any clues where to look for?
