HP CQ61 ( DA00P6MB6D0) No power

[kandyan]

I have no power HP CQ61 ( DA00P6MB6D0) with following details.

01. No power LED (base LED) when connect the charger
02. 3.3v and 5v is available and 12v is also available.
03. BIOS flashed
04. Checked BIOS with oscilloscope its reading
04. ACIN = 3.3V
05. LID_EC# = 3.3V
06. RSMRST # = 0V
07. Replaced KB3926 but same results
08. No short circuit on the board

Where should i start?

[atsio]

Re: HP CQ61 ( DA00P6MB6D0) No power

Check resistance at pr61, PL8, PL9, PL12, PL6, PL10, PL11, PIN 6 of PU7, PIN 1 of PQ63

[spidey]

Re: HP CQ61 ( DA00P6MB6D0) No power

this model usually has issues with bios, try flashing another rom/dump, check rtc battery. also try soft reflow on ICH if above doesnt work.

[kandyan]

Re: HP CQ61 ( DA00P6MB6D0) No power

Check resistance at pr61, PL8, PL9, PL12, PL6, PL10, PL11, PIN 6 of PU7, PIN 1 of PQ63

PR61 - 6.3 Mohm
PL8 - 0.6 Kohm
PL9 - 1.04 Mohm dropping decreasing speed
PL12 - 12 ohm
PL6 - 46 ohm
PL10 - 6.0 ohm
PL11 - 1.250 Kohm
PIN 6 of PU7 - 230 ohm
PIN 1 of PQ63 - 312 ohm

all these values were measure to the ground (GND)

[atsio]

Re: HP CQ61 ( DA00P6MB6D0) No power

Give voltage on all pins of PU5.

[aanan]

Re: HP CQ61 ( DA00P6MB6D0) No power

check crystal y4
check +3VPCU_EC pin 64
check +3VPCU

[kandyan]

Re: HP CQ61 ( DA00P6MB6D0) No power

Give voltage on all pins of PU5.

1. 5.13V
2. 2.1V
3. 1.15V
4. 0.45V
5. 10.4mV
6. 0v
7. 9mV
8. 2.4v
9. 0v
10. 1.8v
11. 1.18v
12. 0v
13. 0v
14. 0v
15. 5.13v
16. 5.13v
17. 0.63v
18. 0.63v
19. 19.11v
20. 19.11v
21. 0.63v
22. 0.62v
23. 10mv
24. 18.07v

[kandyan]

Re: HP CQ61 ( DA00P6MB6D0) No power

check crystal y4
check +3VPCU_EC pin 64
check +3VPCU

Crystal is working. I checked it with my oscilloscope.
+3VPCU is ok
+3VPCU_EC is available @ 67th pin (AVCC) of U20 (KB3926QF)

[atsio]

Re: HP CQ61 ( DA00P6MB6D0) No power

What is the voltage on pins 64, 65, 66, 72, 86, 26, 27 of U20?

[kandyan]

Re: HP CQ61 ( DA00P6MB6D0) No power

What is the voltage on pins 64, 65, 66, 72, 86, 26, 27 of U20?

64 3.4mV
65 2.6v
66 8.3mV
72 2.3mV
86 3.0v
26 0v
27 1.88v

[atsio]

Re: HP CQ61 ( DA00P6MB6D0) No power

What is the voltage on the middle pin of your power adapter? What is the voltage on pin 3 of CN3?

[kandyan]

Re: HP CQ61 ( DA00P6MB6D0) No power

What is the voltage on the middle pin of your power adapter? What is the voltage on pin 3 of CN3?

Sorry guys, I used Huntkey muti adapter for testing. after you mentioned about adapter i changed it and test with an original 18.5v adapter.now board is working. it turns on but caps lock blink error (single blink).

I forgot to tell you that this motherboard has been repaired previously and removed IDT audio chip. And now when i turned on U49 become hot extremely and smoke coming out of it.

I think previous technicain removed audio IC for this problem.I will check U49 and let u knw guys. Thanks for helping this far.

[kandyan]

Re: HP CQ61 ( DA00P6MB6D0) No power

PL5 and PL6 has 37mV (+vcore)
Caps lock blink code error - Single blink for "CPU not functional"

I change the processor but nothing happened.

[atsio]

Re: HP CQ61 ( DA00P6MB6D0) No power

You mentioned earlier on PL6 resistance was 46Ohm. That was with CPU or without?
What is the resistance on pins 20, 31, 48 of PU1.
What is the resistance on pin 1 of PQ17?

[kandyan]

Re: HP CQ61 ( DA00P6MB6D0) No power

You mentioned earlier on PL6 resistance was 46Ohm. That was with CPU or without?
What is the resistance on pins 20, 31, 48 of PU1.
What is the resistance on pin 1 of PQ17?

Yes it was with CPU. But now i get 45 ohms for both PL6 and PL5 with CPU.

PU1

20 -5.3Mohms and decreasing
31- 0.595Kohms
48- 0.526Kohms

When power on VR_ON is up (pin 44 - Before power on- 0v after power on -3.3v)

PQ17 - 0.459Kohms

[corrupto]

Re: HP CQ61 ( DA00P6MB6D0) No power

I have the same problem. anyone has a fix for it? other sites refer the bios chip as the problem, but i think i dont have the tools to solder a new one and reflash it

[Ramee]

Re: HP CQ61 ( DA00P6MB6D0) No power

I have the same problem. anyone has a fix for it? other sites refer the bios chip as the problem, but i think i dont have the tools to solder a new one and reflash it

I suggest you take it to a ProTech to do it for you. But if you want to experience it, invest some appropriate tools for fixing laptop.

[cicariello]

Re: HP CQ61 ( DA00P6MB6D0) No power

diagram?

[cicariello]

Re: HP CQ61 ( DA00P6MB6D0) No power

Good evening someone has the diagram of the motherboard?

[bsb1106]

Re: HP CQ61 ( DA00P6MB6D0) No power

I have same problem but in pin 17/18/21/22 of pu5 i have 4.63v