Hp 2000 issue

[hazim]

hp model : 2000-2d03sx mb : 6050a2498701 a02

no power on power supply ampere 00

fet q9448 bad i replace it

after that volt on charger coil 19 v

on charger resistor 19v

but no 5 - 3 volt at all power system ic 11-fh in schematic tps51123rge

on power system q309 0 volt
q317 19 v on D

q310 0 volt
q318 19 v on D

on battery connect 19 v and 0.5 volt

i need your help

[Techtiger]

Re: Hp 2000 issue

The battery connector 19V to high check Q9448 fet for short , pin 1 2 should be 9-12 V, check BQ24728 all pins Voltage report back , trace ADP_ID for Voltage, check pin 16 17 8 of U307

[mcplslg123]

Re: Hp 2000 issue

Start with pg7 of schematic and check voltage on all pins of Q9447/9448,Q310 first. After these measurements, if everything is fine, lets probe U307 IC. but basic dc in fets check first.

[hazim]

Re: Hp 2000 issue

hi i examine mb and checked voltage

Q9447 G20 S20 D20

Q9448 G19.4 S19.7 D20

BQ27728 : U302
1- 0 V
2- 19 V
5- 0.18 V
6- 0V
7-0 V
8- 19.7V
10 - 19.5V
15- 2.7
20- 20 V VCC

Q318 ALL 0 VOLT
Q310 G0 S0 D20V

U307 TPS

PIN
8- 0V
16- 0.0016 VIN
17- 0.5V
18- 0V

D301 0.9 ------1.1 V ADP ID AS I THINK
D305 0--------- 2.7 V

NO SHORT IN FETS
NO HEAT

where is the problem

[raajkumar]

Re: Hp 2000 issue

U302 may be the faulty part. If you have any spare, try to replace it and check it.

[mcplslg123]

Re: Hp 2000 issue

Q9447/48 gate voltage is wrong. They are N channel fets, so gate voltage should be higher than souce. So U302 is not working. So first, replace U302 as suggested by@raajkumar.

[piernov]

Re: Hp 2000 issue

Q9447 is shorted.

[hazim]

Re: Hp 2000 issue

Q9447 is shorted and i replace it with n-chanel 8444

after that G0 S0 D20

Q9448 shorted again i replace it with n-chanel 8444

all S0 D0 G0

i found Q305 short and its place on mb short also

u302 vcc 0

there is capacitor near u302 vcc capacitor short

[hazim]

Re: Hp 2000 issue

hi

after more diagnostic and studying schematic

i find d345 bad and ceramic capacitor short near ic u307 by inject volt on charger resistor

i replaced and lap power on

thank you so much

[mcthr]

Re: Hp 2000 issue

how many volts un inject sir in 19v resistor

[lapfix]

Re: Hp 2000 issue

how many volts un inject sir in 19v resistor

You can start by 1volt/1amp