Dead hp dv6 (quanta ut3)

[v1406]

Dear All,
Hello !

I am looking for a solution to a dead HP DV6-1235ee laptop with the following motherboard:
Foxconn
ML1-H94V-0E253117
168UT30001-094D
quanta ut3 schematics

PU1:: ISL6262
PU2:: RT8206B
PU3:: 8119LN
PU4:: P2805
PU5:: ISL6251

som of the voltages i measured:
DC jack = 19.93V
+VA = 19.90V
+VAD = 19.71V
+VIN = 19.71 V
+5VPCU = 5.25V
+3VPCU = 3.45V
+5VALW = 5.25V
+12VALW = 8.70V ?? is it fine or is overloaded somewhere?


Voltages At EC (KB3926)

9, 22, 33, 67, 96, 111, 125 (3VPCU) = 3.4V
037 3920_RST# = 3.3V
127 LID_EC# = 3.25V
086 ACIN (ACIN_1) = 3.1V

019 NBSWON#1 =3.4 / 0V (before /after power button)
090 DNBSWON#1 3.4 / falls to 0.2V gradually rises to 0.5V and settles there

95 RSMRST# 0V / 2.8 V only for half a second when you press the power button and then falls back to 0V

16 SUSC# 30 mV / 275mV again falls to 30 mV
06 SUSB# 30 mV / 550 mV again falls to 30 Mv

BIOS ( U22 sheet no 34)
Pin no. name voltage
1 BIOS CS# 0.18 V isnt it too low?
2 BIOS RD# 1.64 V
3 SPI 3P 3.4 V
4 VSS 0 V
5 BIOS WR# 0.25 V
6 SPI CLK 1.5 V
7 SPI 7P 3.4 V
8 VDD 3.4 V


I would request you to kindly let me know what is going wrong which is preventing the rsmrst voltage from getting high. it tries to go high but falls down immediately to zero.

I dont know what to do now. kindly show me the path to tread.

thanks in advance.

[v1406]

Re: Dead hp dv6 (quanta ut3)

Looking forward to a few comments from all of you.....

thanks

[v1406]

Re: Dead hp dv6 (quanta ut3)

[v1406]

Re: Dead hp dv6 (quanta ut3)

come on badcaps forum users......... it has been two days and not a single comment?

please give some feedback

thanks

[trebo]

Re: Dead hp dv6 (quanta ut3)

come on badcaps forum users......... it has been two days and not a single comment?

please give some feedback

thanks

Have you read this one

https://www.badcaps.net/forum/showth...ghlight=hp+dv6

[v1406]

Re: Dead hp dv6 (quanta ut3)

still no response from such an active forum ........ unbelievable !!

[v1406]

Re: Dead hp dv6 (quanta ut3)

is it a forum NOT FOR TECHNICIANS ??

[ben7]

Re: Dead hp dv6 (quanta ut3)

Look at post number 5.

[v1406]

Re: Dead hp dv6 (quanta ut3)

had a good look at that reply no 5. but that is something different....

if you want pictures , i can upload those but vissibly there is not any burnt component or dry solder....

hopefully someone can tell me how to troubleshoot it by measuring voltages in a logical sequence

thanks for your input.

[v1406]

Re: Dead hp dv6 (quanta ut3)

sure many of you know where the problem is........ you just need to share your knowledge with others.

waiting for your reply

[dycc]

Re: Dead hp dv6 (quanta ut3)

when you press the power switch button the power on led is lit or not .

[dycc]

Re: Dead hp dv6 (quanta ut3)

do you have the power on sequence of this laptop ????
why do you think RSMRST# is the guilty ????

RSMRST can be an impulse !!!!

i suspect the southbridge and the kb3926 . first reflow the southbridge and if it is not OK , you must change the kb3926.

good luck

[olegi]

Re: Dead hp dv6 (quanta ut3)

Basically when you press power ON (NBSWON#1) what happen ?
Power +5VPCU = 5.25V; +3VPCU = 3.45V; +5VALW = 5.25V it is a bit high .Any trace of liquid.

[fddizon]

Re: Dead hp dv6 (quanta ut3)

v1406,

you said +12VALW but you have 8.70V. check capacitors connected to this line.

you said when you press power on, rmsrst got normal voltage, but goes to ov. check destination part. i suspect that when current reaches the components along its path, it goes off.

[xaviero1412]

Re: Dead hp dv6 (quanta ut3)

for 12v and become 8.7v , it usually the ic that supply that voltage gone wrong, try reflow the ic first, or replace with new one.

[fddizon]

Re: Dead hp dv6 (quanta ut3)

for 12v and become 8.7v , it usually the ic that supply that voltage gone wrong, try reflow the ic first, or replace with new one.

12v regulator IC?

[lucco85]

Re: Dead hp dv6 (quanta ut3)

Check SUSB# and SUSC# when DNBSWON is low
Bios CS#, RD# should check the waveform, do you have a constant waveform at these pins
As I can see, no need for a 12v start board!?

[v1406]

Re: Dead hp dv6 (quanta ut3)

Check SUSB# and SUSC# when DNBSWON is low
Bios CS#, RD# should check the waveform, do you have a constant waveform at these pins
As I can see, no need for a 12v start board!?

Thanks for your comments.

Frankly speaking, I had left the hope of receiving any worthy comments after a few days of lull.... but i am glad i was totally wrong. it took some time but by now there are plenty of them.

thanks again.


coming to the point, i have already mentioned the low state of susb and sus c in my original post.

Voltages At EC (KB3926)

9, 22, 33, 67, 96, 111, 125 (3VPCU) = 3.4V
037 3920_RST# = 3.3V
127 LID_EC# = 3.25V
086 ACIN (ACIN_1) = 3.1V

019 NBSWON#1 =3.4 / 0V (before /after power button)
090 DNBSWON#1 3.4 / falls to 0.2V gradually rises to 0.5V and settles there

95 RSMRST# 0V / 2.8 V only for half a second when you press the power button and then falls back to 0V

16 SUSC# 30 mV / 275mV again falls to 30 mV
06 SUSB# 30 mV / 550 mV again falls to 30 MvBIOS ( U22 sheet no 34)
Pin no. name voltage
1 BIOS CS# 0.18 V isnt it too low?
2 BIOS RD# 1.64 V3 SPI 3P 3.4 V
4 VSS 0 V
5 BIOS WR# 0.25 V
6 SPI CLK 1.5 V
7 SPI 7P 3.4 V
8 VDD 3.4 V


I am sorry to report that i dont have any cro so cant check the waveforms.
is there an easier way out there??
someone suggested to remove the bios totally and then try to power on. is that alright??

basically i want to know what is preventing the rsmrst to get to high state. it tries to get high but something shuts it down again. that something ...is the culprit ... which i want to trace.

also 12 v ... is it designed that way ....to be low in the begining and gain full strength at power on??

its getting lengthy so i will stop here and wait for your reply..... and then we will interact more

thanks once again for your interest

[v1406]

Re: Dead hp dv6 (quanta ut3)

Basically when you press power ON (NBSWON#1) what happen ?
Power +5VPCU = 5.25V; +3VPCU = 3.45V; +5VALW = 5.25V it is a bit high .Any trace of liquid.

thanks for your interest

there is no liquid spillage.

it was a bit dusty but i have cleaned that all.

the voltages will drop down with rise in current demand.

thanks again

[v1406]

Re: Dead hp dv6 (quanta ut3)

when you press the power switch button the power on led is lit or not .

thanks for your comments. sorry i could not reply earlier.

in these dv6 laptops there is an LED just around the dc jack. that lights up as soon as you plug in the adapter. that LED is glowing .

but the LED that comes on after pressing the power button tries to glow......... very faint pulse of light comes when i press the power button but in less than half a second that goes off.

....... just like the rsmrst signal

thanks again