compaq 6510b chaging issue

[akande]

i have compaq 6510b that will not power on with charger but can work fine with a charged batt, little check done q507- s=19v, d=17.5, d=0v pls kindly guide me to fix the fault

[Techtiger]

Re: compaq 6510b chaging issue

Check the Voltage in U5 8.9.26.5.29.22.4.27
check the Voltage in Q539 pin 1.2.3 & D12 pin1.2
Check your Adapter 90W
Check U14 pin 74 ADP_PRES

[akande]

Re: compaq 6510b chaging issue

Check the Voltage in U5 8.9.26.5.29.22.4.27
check the Voltage in Q539 pin 1.2.3 & D12 pin1.2
Check your Adapter 90W
Check U14 pin 74 ADP_PRES

q539 pin 1,2,3=18.0v d12=17.8v
u5 pin8, 9.26.5.29.22.4.27 =0v
pin 74 = 0v

[Techtiger]

Re: compaq 6510b chaging issue

DC jack pin 3 LIMIT_SIGNAL ? Q507 pin4 Gate Voltage is to high 18V to bypass it should be less than 10V , test Q507 for any short G/D/S

[akande]

Re: compaq 6510b chaging issue

DC jack pin 3 LIMIT_SIGNAL ? Q507 pin4 Gate Voltage is to high 18V to bypass it should be less than 10V , test Q507 for any short G/D/S

q507 not short but g=17v

[Techtiger]

Re: compaq 6510b chaging issue

DC jack pin 3 LIMIT_SIGNAL ? Test Q514 for any short as well

[akande]

Re: compaq 6510b chaging issue

LIMIT_SIGNAL trace to q22 S=5.6V, D=0V, G=0V
Q514 NOT SHORT

[Techtiger]

Re: compaq 6510b chaging issue

remove Q507 put the multimeter Diode mode value S.D.G
test all pins of Q545

[akande]

Re: compaq 6510b chaging issue

remove Q507 put the multimeter Diode mode value S.D.G
test all pins of Q545

q507 removed S=18.2V, G17.6V D=0V
Q545 B=16v C&E=0V

[smali]

Re: compaq 6510b chaging issue

Check u6(lm393)

[akande]

Re: compaq 6510b chaging issue

Check u6(lm393)

THANKS BRO AFTER REPLACING U6, all seem ok but still not coming up , i found out there is short pin 19 of u28. i replace c336, remove use u28 but short remain plz

[ktmmotocross]

Re: compaq 6510b chaging issue

thats bad. +V3AL is on many lines. try to inject voltage to find bad component faster

[smali]

Re: compaq 6510b chaging issue

follow the ktmmotocross insturction inject external 3v with high amps on the short line and observe the pcb the faulty component will be heatup....i think your smsc kb1070 may be faulty...

[akande]

Re: compaq 6510b chaging issue

thats bad. +V3AL is on many lines. try to inject voltage to find bad component faster

after injecting my u14 become very hot

[ktmmotocross]

Re: compaq 6510b chaging issue

follow the ktmmotocross insturction inject external 3v with high amps on the short line and observe the pcb the faulty component will be heatup....i think your smsc kb1070 may be faulty...

NO HIGH AMPS!!!

with 3V put max 2A =6W and rise it if u cannot find component. if u put 5 or higher amps u can burn component and WELDING COMPONENTS LEG TO PAD which is way harder to repair

[ktmmotocross]

Re: compaq 6510b chaging issue

after injecting my u14 become very hot

remove it and check if short is gone. than measure its pads for short to check if it have internal short or some of its output is shorted