HP ENVY 15 no power

[stingerchamp]

Re: HP ENVY 15 no power

It indicates generally leaking capacitor or Freq or ripple effect

In short coil is filters and capacitor are there for smooth DC signal without any frequency mixed

If 5v effected then board will still run

But if 3.3v ic effected board will turn on for 1 sec

Pq40 check

[nassih]

Re: HP ENVY 15 no power

i have 5V on PL20 without pressing power button
in this motherboard i have q40.
i will search for this
tanks sir

[nassih]

Re: HP ENVY 15 no power

pq40 without pressing power button i have pin1=0v pin2=0.438v pin3=1.6v
when i press i have 3.3v pin3

[stingerchamp]

Re: HP ENVY 15 no power

Interesting,Confirm 19v is fluctuating

As per schematic diagram

It is 5vs5_s which is a suspend voltage and should generate after power button pressed

And same case with 3v

S5 means state always in general but when we have 5vs5_s last s denotes suspend logic

Correct me if I am wrong

We need DSO or oscilloscope to check smooth DC signal or any ripple


For your information only

According to signal sequence logic in general

En2 pin at pu11 is just there to generate ldo after we get vin, en1 at pu11 is to start the IC for work and generate 3vs5 at coil when s5_on comes.

1.6 voltage at pin is not ok it should be equal or more 2 volt as when you see datasheet there is 10ampere current source or some voltage source available which will set it up

[nassih]

Re: HP ENVY 15 no power

ok its important all these,i will ask u when i comeback at my workshop
about oscilloscope i haven't at this moment

[nassih]

Re: HP ENVY 15 no power

i noticed D11 is zener diod 3.6v en datasheet but its measured 2.2v

[nassih]

Re: HP ENVY 15 no power

PD11 not D11 sorry

[nassih]

Re: HP ENVY 15 no power

(S5 means state always in general but when we have 5vs5_s last s denotes suspend logic)
what do you means about this?if you can explain pls

[stingerchamp]

Re: HP ENVY 15 no power

Read zener diode in series

Suspend logic , you get voltage at coil after pressing power button

Always logic , you get voltage at coil before pressing power button

[stingerchamp]

Re: HP ENVY 15 no power

Correction 5vs5_s is not suspend here
You are getting 5v before pressing power button

If zener is connected in series it will drop it's voltage and let remaining pass

If zener is in parallel it will let pass only depicted voltage
or maintain voltage

S5_on signal check with DSO or oscilloscope

[nassih]

Re: HP ENVY 15 no power

thank you for all the effort and support you have given me, I will give up this repair and return the laptop to its owner, let's wait for another thread I wish you good success with your repair
best regard

[stingerchamp]

Re: HP ENVY 15 no power

You could have repaired it with DSO we can check clock ,data and frequency for any node.

Anyhow it is your decision , buy a good oscilloscope as it will reduce your repair time and it confirms which multimeter can not.


I am not a repair person just a computer engineer who is learning this all and sharing my knowledge

Good luck

[nassih]

Re: HP ENVY 15 no power

You could have repaired it with DSO we can check clock ,data and frequency for any node.

Anyhow it is your decision , buy a good oscilloscope as it will reduce your repair time and it confirms which multimeter can not.


I am not a repair person just a computer engineer who is learning this all and sharing my knowledge

Good luck

yes sir with oscilloscope its better and professional i will think about it,
what is DSO pls if u have any document or PDF tanks sow much bro

[stingerchamp]

Re: HP ENVY 15 no power

Digital storage oscilloscope

Buy uni t ---cost effective limited 100mhz


Digitally analyses of signal and voltage level.

Benefits

With oscilloscope

You can check rtc section 32.768khz clock

You can check green clock 25mhz, 14,MHz, etc

You can check phase of any ic output

It will clearly show frequency of clock

In case there is ripple or glitch in signal
In seconds you will find

In some cases battery plugin not charging
Smbus ,SDA and scl voltage value be correct 3.3v
But when you check with DSO it will show data or clock is missing at battery connector pins


You can check input and output of any coil without any doubt

You can check bios pin 1 chip select signal with DSO

It will go up then down then up and remains high
When you press power button

You can check any clock signal available

Many more

Watch videos how to set dso

Good luck

[nassih]

Re: HP ENVY 15 no power

thank you very much sir it's very interesting all this is it saves a lot of time and energy thank you again,see you in next topic
good luck for all