HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

[venadillo]

Re: HP Pavilion Laptop Motherboard Not Starting Up

have same issue quanta r53 but my case no have 3.3v in pin 11 kbc only have 0v any help

[venadillo]

Re: HP Pavilion Laptop Motherboard Not Starting Up

hi friend have issue hp g6 quanta r53 no power , no have 5v 3.3v
power button act, 3.3v , vreg5 5v vreg3 3.3v
any help

[mon2]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

vreg5 5v vreg3 3.3v

You HAVE these rails working on PU7 ?

VREG5
VREG3

[mcplslg123]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

@venadillo, gone thru your PM. We can help but for that you need to start a thread with useful information. You have given practically no information.

So, you confirm VREG3/VREG5 is present but no voltage on coil. Is that correct??

If yes,Check the following

01.PU12 IC-Pin20/17/15/13

02.PU8-Pin5 Voltage??

AD_ID voltage??

Post these measurements and then will follow the progress.

Btw, No DC Jack Light glowing??

[Crabolog]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

Hi, have almost the same issue, hp pavilion g6, DA0R53MB6E0, with AC in, after click on pwr button, led blinking 3 times, no power on.

Here are some measurements:
vin 19.2
vin on PU7 16 pin = 2.5v
VREG5 = 0.008v
VREG3 = 1.7v
ENABLE = 0V
POWERGOOD = 0V
ENTRIP1 = 0.01V
ENTRIP2 = 0V

Additionally when AC in, I can feel with my finger that PU12 discharge IC is pretty hot.

Could someone please advice on this, thanks

[Sephir0th]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

Check the Resistance to GND of the Enables and the outputs (VREG3, VREG5, Phase1 and Phase2) around PU7. Maybe already something supsicious to measure there.

[mcplslg123]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

PU7, pin16-VIN-must be 19V. Are you measuring the pin correctly. the dot mark on the IC is pin1 and next pins in anti-clockwise fashion.

[Crabolog]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

I've just double-checked:
PU7, pin16 - 2.5v

GND to:
VREG3 = 105 kOhm
VREG5 = 10 Ohm
PHASE1 = 10 kOhm
PHASE2 = 9.3 kOhm
ENABLE = infinite

Anything else I can check?
PQ50, PQ53 pins 5/6/7/8 = 19.7v, while schematic says there should be 5v.
PQ51, PQ52 = no voltage
PL24, PL25 = no voltage
pr245, white resistor = 2.9v

resistance to gnd:
PL24, rising from 10 to 12 kOhm
PL25, falling from 12 to 9.5 kOhm
PC74 = 10 Ohm

[Sephir0th]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

I've just double-checked:
PU7, pin16 - 2.5v

GND to:
VREG3 = 105 kOhm
VREG5 = 10 Ohm
PHASE1 = 10 kOhm
PHASE2 = 9.3 kOhm
ENABLE = infinite

Anything else I can check?
PQ50, PQ53 pins 5/6/7/8 = 19.7v, while schematic says there should be 5v.
PQ51, PQ52 = no voltage
PL24, PL25 = no voltage
pr245, white resistor = 2.9v

resistance to gnd:
PL24, rising from 10 to 12 kOhm
PL25, falling from 12 to 9.5 kOhm
PC74 = 10 Ohm

We have Multiple or another fault present here. Check resistance to GND of Pin16, too

One fault might be there or a burned PR110

The thing with PQ50 and PQ53 is your wrong interpretation of the Drain designation and missing understanding of how a buck converter works.

[mcplslg123]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

VREG5 is shorted but first need to fix VIN of PU7. No point troubleshooting PU7 unless VIN is fixed. PQ50/53-@sephiroth has already highlighted your misunderstanding-its correct at 19V. Do follow his suggestions and check resistance to GND on PR124-any pin. PR124 is located just after dc-in mosfets.

[Crabolog]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

PR 110 resistance is 0.460 kOhm
Resistance PU7 pin 16 to the ground is not stable, during the measure it fell from ~6 mOhm to 3 mOhm and keeps falling.
Same for PR124 - gnd, it falling from >10 mOhm to 3 mOhm and below, like if capasitor is loosing it's charge.

Anything else I can check? appreciate your answers

[Sephir0th]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

PR10 is supposed to have 10Ohms internal resistance, so it has failed open. Likely caused by a bad PU7. For VREG5 you could inject 1V and see whether PU7 is getting hot or something else. Should be enough proof then to finally remove it afterwards.

[mcplslg123]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

Yes, replace PR10 as suggested with rated value and then remove PU7 from the board(dont put power while PU7 is removed). Check resistance on VREG5 again after removing PU7.

[Crabolog]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

You guys mean PR110 ?

[Sephir0th]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

Yes, PR110

[Crabolog]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

Changed pr110 to 10 Ohm resistor and removed PU7

Resistance to gnd:
VREG5 = 0.86 megaohms
VREG3 = 410 kOhms

Anything else I should check or proceed with installing new PU7?

[Sephir0th]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

I have nothing against to proceed with PU7. precautions made, Should be fine now.

[Crabolog]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

Still not starting.

Vin on PU7 = 19.7v
VREG3 = 3.3v
VREG5 = 5.2v
PWRGOOD = 0v
PHASE1 = 0V
PHASE2 = 0V
ENTRIP1 = 0V
ENTRIP2 = 0V
ENABLE 0V
LGATE1 = 0V
LGATE2 = 0V
UGATE1 = 0V
UGATE2 = 0V
BOOT1 = 4.5V
BOOT2 = 4.5V

PU12 is still getting hot, pin 15 ACIN on it has 0.005v, pr175 has 19.7v on one pin and 2.3v on another pin that is closer to PU12

led is blinking 3 times and thats all. Please advice

[Crabolog]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

PU12 pins:
20 VIN = 19.0V
17 VOUT = 20.4V
15 ACIN = 0.005V
13 12VALW = 11.8

PU8
pin 5 ACPRES = 0.005v
pin 6 ACDET 2.8V

PR100 has 19.7v on one pin, and 0.08 on the other pin

[mon2]

Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

Check the voltage to ground of:

Pu8

Pin 20 - VCC
Pin 16 - REGN
Pin 4 - ACDRV

Post each measurement.