Toshiba No power bad charger ic?

[kalilinux25]

LAPTOP: toshiba c55-c1924
serialnumber : not visable anymore
MOTHERBOARD: DABLQMB16B0 REV B

ISSUE No power
no power consumption on dc supply
check cahrger ic


ISL88731

1-NC
2-ACIN
3-VREF
4-ICOMP
5-NC
6-VCOMP
7-NC
8-ICM
9-SDA
10-SCL
11-VDDSMB
12-GND
13-ACOK
14-NC
15-VFB
16-NC
17-CSON
18-CSOP
19-PGND
20-LGATE
21-VDDP
22-DCIN
23-PHASE
24-UGATE
25-BOOT
26-VCC
27-CSSN
28-CSSP

[Techtiger]

Re: Toshiba No power bad charger ic?

LAPTOP: toshiba c55-c1924
serialnumber : not visable anymore
MOTHERBOARD: DABLQMB16B0 REV B

ISSUE No power
no power consumption on dc supply
check cahrger ic


ISL88731

1-NC
2-ACIN
3-VREF
4-ICOMP
5-NC
6-VCOMP
7-NC
8-ICM
9-SDA
10-SCL
11-VDDSMB
12-GND
13-ACOK
14-NC
15-VFB
16-NC
17-CSON
18-CSOP
19-PGND
20-LGATE
21-VDDP
22-DCIN
23-PHASE
24-UGATE
25-BOOT
26-VCC
27-CSSN
28-CSSP

You have not provided the ISL88731 pin voltages

[kalilinux25]

Re: Toshiba No power bad charger ic?

You have not provided the ISL88731 pin voltages

1-NC -
2-ACIN – 4.0V
3-VREF – 3.1V
4-ICOMP -0V
5-NC -
6-VCOMP – 0V
7-NC -
8-ICM – 0V
9-SDA -0V
10-SCL- 0V
11-VDDSMB- 0V
12-GND -
13-ACOK- 0V
14-NC- 0V
15-VFB- 0V
16-NC- 0V
17-CSON – 0V
18-CSOP – 0V
19-PGND – 0V
20-LGATE – 0V
21-VDDP – 5V
22-DCIN – 19V
23-PHASE -1.5V
24-UGATE -1.7V
25-BOOT – 6.0V
26-VCC – 5.0V
27-CSSN -19.8V
28-CSSP – 19.8V no 3v and 5v on coils




RT6575AGQW

CS2- 0V
FB1-0V
LDO3-0V
FB2-0V
CS2-0V
EN2-0V
PGOOD-0V
PHASE2-0V
BOOT2-1.4V
UGATE2-0V
LGATE2-0V
VIN-5.0V
LD05-0V
BYP1-0V
LGATE1-0V
UGATE1—0V
BOOT1-0V
PHASE1-0V
VCLK-0V
EN1-0V "check all pins no shorted to gnd also" no low resistance

[Techtiger]

Re: Toshiba No power bad charger ic?

For ISL88731, ACOK 0V should be a clue that this line is connected to the voltage divider R1 and R2 with Pin 21 (VDDP 5V). trace it back

[Techtiger]

Re: Toshiba No power bad charger ic?

For RT6575AGQW, VIN should not be +5V. What voltage are yougetting for the +B line? Can you provide the voltage readings for the (+19v Line)2 Mosfet terminals: S, D, and G? upload a picture of the motherboard near the DC circuit on both sides. make sure RCTVCC line is fine

[kalilinux25]

Re: Toshiba No power bad charger ic?

For RT6575AGQW, VIN should not be +5V. What voltage are yougetting for the +B line? Can you provide the voltage readings for the (+19v Line)2 Mosfet terminals: S, D, and G? upload a picture of the motherboard near the DC circuit on both sides. make sure RCTVCC line is fine

Thanks mate for the guide ive found that the 1st mosfet in the output side im getting 4v only so Ive decided to change it 6431a msofet, now unit is fully working thanks for the insight