Technical Support hp probook 450 g4

[user50857]

Hello!
I have a shorted motherboard and need your help please.
MB: DA0X83MB6H0 REV: H
PL37 was extremely hot until the tin on the pins melted
after checking 3.3V, 5V controller chip and mosfets I saw they were ok.
I also noticed that +3VPCU was shorted.
unfortunately i don't have a power supply to inject current and see what gets hot.

 

[Patrick Ribbsaeter]

Hello!
I have a shorted motherboard and need your help please.
MB: DA0X83MB6H0 REV: H
PL37 was extremely hot until the tin on the pins melted
after checking 3.3V, 5V controller chip and mosfets I saw they were ok.
I also noticed that +3VPCU was shorted.
unfortunately i don't have a power supply to inject current and see what gets hot.

if u dont have a powersupply, just use your Dc adapter then.. Sprinkle some rosin across the board on some components you suspect to be HOT. or take some alcohol and dab it on different places, if a sound fizzles, you found the issue. best if u have a infrared camera.

 

[user50857]

it doesn't work like that.
on dc adapter pl37 got hot and I removed it. but it got hot because +3vpcu was shorted.
i have to find where it is shorted and then place the pl37 again

 

[Patrick Ribbsaeter]

it doesn't work like that.
on dc adapter pl37 got hot and I removed it. but it got hot because +3vpcu was shorted.
i have to find where it is shorted and then place the pl37 again

so u better get a power supply so you can check it... its a good investment.. and a something you need

 

[user50857]

i know bro i have ordered it but transporting has been a problem with covid

 

[Patrick Ribbsaeter]

i know bro i have ordered it but transporting has been a problem with covid

yes, its taking time now everything.. hope you solve the case

 

[user50857]

Thanks bro

 

[Notebook Centro CHILE]

Hello!
I have a shorted motherboard and need your help please.
MB: DA0X83MB6H0 REV: H
PL37 was extremely hot until the tin on the pins melted
after checking 3.3V, 5V controller chip and mosfets I saw they were ok.
I also noticed that +3VPCU was shorted.
unfortunately i don't have a power supply to inject current and see what gets hot.

First you have to lift one end of PL37, then measure resistance to ground, one of the pins should mark zero, if it is on pin 2 of the inductor, remove the solder (if there is), in PJP7, check that pin 1 of PL37 and PJP7 do not score zero. It is possible that the short is at + 3V_SRC, this is a stage that is used to test current and be able to generate the + 3V_ALW later. On the contrary, if the short is on pin 1 of PL37 and PJP7, it is possible that it is a general short on VIN ...
I suggest that if you do not have much experience, do not inject current, use the multimeter. Greetings.
Luck!

 

[user50857]

i have used power supply before and i am aware for the risks. and i know +3vpcu is shorted. just asked if there is any other way to find the damaged component without removing everything connected to +3vpcu and gnd

 

[Notebook Centro CHILE]

i have used power supply before and i am aware for the risks. and i know +3vpcu is shorted. just asked if there is any other way to find the damaged component without removing everything connected to +3vpcu and gnd

To find a short, the first rule is to isolate it. Remember: we can make a metaphor about the flow of electrons replacing it with water, in the event of a leak. What is the most logical thing to do? I was just trying to help. Greetings