HP Pavilion 17 Black Screen Help !

[Lomar02250]

Hello everyone. I'm new to the forum and I'm here to ask you for help with a challenge I set myself. That of repairing my daughter's PC.

The PC is an HP Pavilion 17 series.
Motherboard: DAOR75MB6C0 REV. C

The failure, the PC screen remains black. The power light is on and the fan is spinning.

Here are the different things that I tested while browsing the internet.

Connecting the PC to an external screen via HDMI, no signal.
Swapping RAM sticks still doesn't work. Change with new ones, same thing.
Test the CMOS battery, it no longer works, replace with a new one. still does not work.
Unplug everything except the power supply, no effect.

I don't know what else to try.

Thanks for helping me. Cordially.

[Techtiger]

Re: HP Pavilion 17 Black Screen Help !

Since you have done the basic things you can move forward dissemble it and check for any physical damage any components , in the Mob you have BIG GRAY coils you have to test one by one with multimetre see what voltages are missing , may be due to bad BIOS

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Check the physical condition of the components seems to me to be a good idea but where to start, are there any components to look at first because at a glance everything seems correct to me but I may be wrong.

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Thanks, I'll start with the coils. I'll keep you informed.

[Techtiger]

Re: HP Pavilion 17 Black Screen Help !

Check the physical condition of the components seems to me to be a good idea but where to start, are there any components to look at first because at a glance everything seems correct to me but I may be wrong.

Upload a pic of the Mob both side's we will give the poins to check

[mcplslg123]

Re: HP Pavilion 17 Black Screen Help !

Is this amd motherboard??

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

yes the motherboard is a AMD

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

I started to test some components around the processor, component PC209 and PC213 have 0 volts! is this normal?

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Attached is a photo of the components in question.

[Techtiger]

Re: HP Pavilion 17 Black Screen Help !

the Gray coils are mark as PL20 example (power inductor) check the voltage all of them

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Thank you very much for the photo. How do we test these CMS ? Please

[Techtiger]

Re: HP Pavilion 17 Black Screen Help !

Thank you very much for the photo. How do we test these CMS ? Please

Connect the power btw / bios battery /the ram /fan for the Mob power up it up take the multimeter put the black probe for a Ground point red probe for one side of the Gray coil and mesure the voltage writer down with the PL number

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Sorry techtiger I have trouble understanding, I saw in your profile that you are from Paris. Being myself from France, and not understanding English very well, could you please explain the procedure to me in French. Thanks in advance.

[Techtiger]

Re: HP Pavilion 17 Black Screen Help !

Connectez le bouton de démarrage à la carte mère puis connectez la batterie bios, la RAM et le ventilateur à la carte mère. Prenez le multimètre, placez la sonde noire sur un point terre, la sonde rouge sur un côté de la bobine grise (Gray coil PL) et mesurez la tension

Connect the start button to the motherboard then connect the bios battery, RAM and fan to the motherboard. Take the multimeter, place the black probe on a ground point, the red probe on one side of the gray coil (Gray coil PL) and measure the voltage
.

[Saihah Fakhriyah]

Re: HP Pavilion 17 Black Screen Help !

Once you're sure it's getting power, check the cable connecting the monitor to the computer. Make sure you have solid connections on both ends. If that doesn't solve the problem, try another cable.

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Connectez le bouton de démarrage à la carte mère puis connectez la batterie bios, la RAM et le ventilateur à la carte mère. Prenez le multimètre, placez la sonde noire sur un point terre, la sonde rouge sur un côté de la bobine grise (Gray coil PL) et mesurez la tension

Connect the start button to the motherboard then connect the bios battery, RAM and fan to the motherboard. Take the multimeter, place the black probe on a ground point, the red probe on one side of the gray coil (Gray coil PL) and measure the voltage
.

Thanks for the help in French. I took the voltage of all the coils. I attach a picture.

Merci, pour l'aide en français. j'ai pris la tension de toutes les bobines. je joint une image.

[Techtiger]

Re: HP Pavilion 17 Black Screen Help !

Can you test PL20 and PL21 voltage again because that’s not the correct supply, PL20 must be 3.3V and PL21 5V

tester à nouveau la tension PL20 et PL21 parce que ce n'est pas correcte, PL20 doit être 3,3 V et PL21 doit êrte 5V

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Can you test PL20 and PL21 voltage again because that’s not the correct supply, PL20 must be 3.3V and PL21 5V

tester à nouveau la tension PL20 et PL21 parce que ce n'est pas correcte, PL20 doit être 3,3 V et PL21 doit êrte 5V

Indeed the mass was not correct I will redo all the coils. PL20 3.37V and PL21 5.05V.

Effectivement la masse n'était pas correct je vais refaire toutes les bobines. PL20 3,37 V et PL21 5,05 V.

[Lomar02250]

Re: HP Pavilion 17 Black Screen Help !

Here are all the tests on the PL

PL10 : 2.69 V
PL20 : 3.33 V
PL21 : 5.05 V
PL22 : 1.51 V
PL7 : 1.77 V
PL13 : 1.19 V
PL19 : 11.30 V
PL24 : 10.55 V
PL25 : 10.45 V
PL26 : 0.00 V
PL27 : 1.09 V
C662 : 11.50 V
C658 : 12.50 V
???? : 10.65 V

[mcplslg123]

Re: HP Pavilion 17 Black Screen Help !

Is this amd motherboard??

Often the problem on this mb with no display is DRAMRST# signal being either zero or pulled low to 0.4v-0.6v. So measure voltage on ram slot pin30 and report back. Your multimeter probe should be sharp and hand not shaky.However, if my observation is correct, your southbridge is faulty.