Compaq620 no 5v 3v in coil.

[nazrul145]

Hello friends, problem with compaq, its U6000 pin 8=3.3v and pin17=5v.
but no voltage in L6001 and L6000.
Flash bios also same. Change U6000 also same.
U6000 pin1 and 2= 0.7v
L6000 resitance to
gnd=18K
and L6001 to ground=1.1k

any idea please..

[dj_ricoh]

Re: Compaq620 no 5v 3v in coil.

check u6009_A and B all pins

[dj_ricoh]

Re: Compaq620 no 5v 3v in coil.

yes! do you got any short on L6000 or L6001?

[nazrul145]

Re: Compaq620 no 5v 3v in coil.

Thanks for reply. No short found from ground to
Coil.

[saularciga]

Re: Compaq620 no 5v 3v in coil.

Measure voltages en Q6005.

KBC_PWR_ ON . do you have 3.3 v?

If press power what voltajes have in Q6004?

[nazrul145]

Re: Compaq620 no 5v 3v in coil.

Kbc_pwr_on 3.3v ok.

[saularciga]

Re: Compaq620 no 5v 3v in coil.

Open PAD6005 and PAD6004 , press power and measure voltages en L6000 , L6001 .
Check Mosfet Q6007,08,09 ,10.
U6000 is activad for the pins 6,1

[nazrul145]

Re: Compaq620 no 5v 3v in coil.

I will check tomorrow because now I am in house.

[saularciga]

Re: Compaq620 no 5v 3v in coil.

Make this.

Measure voltages of U6009.
On pin 1 and 7 should be 3.3 V
check Q6009 and Q6010 , these MOSFET are connected to +VBATP, is very easy to faill

[nazrul145]

Re: Compaq620 no 5v 3v in coil.

Thank you. I didn't understand what you mean.
Only understand q6005 pin 4, 3 and 6,1 should short. If so then I will let's you know tomorrow.

[saularciga]

Re: Compaq620 no 5v 3v in coil.

Only understand q6005 pin 4, 3 and 6,1 should short. If so then I will let's you know tomorrow[I][/I]

Make these connections for work force U6000

[dj_ricoh]

Re: Compaq620 no 5v 3v in coil.

he said to desolder the pads!

there are some jumpers on board that are soldered! with JPAD name!

you take the solder out with wick and recheck voltage on coils

[nazrul145]

Re: Compaq620 no 5v 3v in coil.

i have short q6005 pin3,4.
then power up, after two times again same.
Then i short pin 3,4 and 6,1.
But same no 5v 3v on coil.

[whaldsz]

Re: Compaq620 no 5v 3v in coil.

voltage at pin 13 of U6000?

[atsio]

Re: Compaq620 no 5v 3v in coil.

Make this.

Measure voltages of U6009.
On pin 1 and 7 should be 3.3 V
check Q6009 and Q6010 , these MOSFET are connected to +VBATP, is very easy to faill

Pin 1 and 6 should be between 0,5 and 2v (There is an internal 10uA current source from VREG5 to ENTRIP1 and ENTRIP2) in order to have +3va and +5va. If you short the pins of Q6005 (short to ground) you will never have the above voltages.

Check the resistance on pins 8 and 17 of RT8205 (and also voltages)

[nazrul145]

Re: Compaq620 no 5v 3v in coil.

pin 8 and 17 have 3.3v and 5v.

[dycc]

Re: Compaq620 no 5v 3v in coil.

Pin 1 and 6 should be between 0,5 and 2v (There is an internal 10uA current source from VREG5 to ENTRIP1 and ENTRIP2) in order to have +3va and +5va. If you short the pins of Q6005 (short to ground) you will never have the above voltages.

Check the resistance on pins 8 and 17 of RT8205 (and also voltages)

agree with you Atsio

what is voltage on pin 1 and 6 ??????

sometime bad ESR cap can cause theses types of issue .

i mean C6026 and 6027 cap

[atsio]

Re: Compaq620 no 5v 3v in coil.

Remove Q6005 and check if you have voltage on pins 1 and 6 of RT8205 (what is the resistance on those pins with and without Q6005)

[dycc]

Re: Compaq620 no 5v 3v in coil.

after Atsio's checks and if you don't have ESR meter just solder this cap(attachment) in parallel to C6027 and C6026 .

give result

[nazrul145]

Re: Compaq620 no 5v 3v in coil.

Remove Q6005 and check if you have voltage on pins 1 and 6 of RT8205 (what is the resistance on those pins with and without Q6005)

After remove q6005 U6000,
pin1= 0.7v
pin6=0.8v

with and without q6005 resistance of U6000
pin1=71k
pin6=81k