Skip to main content
Help

Current version by: jayeff ,

Text:

Hi @macksho,
Can you force ''turn off'' the laptop by holding the power button operated for >4 seconds?
''If not'' then as the power button doesn’t seem to be doing anything to signal the IO Interface to turn on/off the laptop, try proving that the power button is electrically OK i.e. there is continuity through the switch contacts when operated.
Here’s the [link|http://h10032.www1.hp.com/ctg/Manual/c04763183.pdf|maintenance and service guide] for the laptop. (I assume that you have a Probook 450 G2 as selected above as the exact model number is not stated in your question).
-Go to p.65 to view the necessary pre-requisite steps and then the procedure to remove the power button board. Not quite sure with your model but I think that there is a 6 wire cable connected to the board and that the actual switch contacts are connected to pins 1 and 2. In any event if the button is OK you should be able to find out by placing an Ohmmeter across the connector pins or cable wires (cable unplugged from motherboard) and measuring a short circuit when the button is operated.
+Go to p.65 to view the necessary pre-requisite steps and then the procedure to remove the power button board. Not quite sure with your model but I think that there is a 6 wire cable connected to the board and that the actual switch contacts are connected to pins 1 and 2. In any event if the button is OK you should be able to find out by placing an Ohmmeter across the two appropriate connector pins or cable wires (cable unplugged from motherboard) and measuring a short circuit when the button is operated.
''If the button is faulty'' then the board part number is 767442-001. Search online using the part number ''only'' to get results for suppliers that suit you best.
''If the button is OK'' here’s a link to the [link|https://www.alisaler.com/hp-probook-440-g2-la-b181p-rev0-5-schematic/|motherboard schematic] that may help. I’m not sure about this but I think that your model also uses the LA-B181P motherboard. Check the number printed on the motherboard itself to verify.
If it is the same motherboard go to p.29 and then p.32 (see pin 73 of chip) to see how the button connects to the IO chipset to signal the intentions of the user.
Hopefully this is of some help.

Status:

open

Edit by: jayeff ,

Text:

Hi @macksho,
Can you force ''turn off'' the laptop by holding the power button operated for >4 seconds?
''If not'' then as the power button doesn’t seem to be doing anything to signal the IO Interface to turn on/off the laptop, try proving that the power button is electrically OK i.e. there is continuity through the switch contacts when operated.
Here’s the [link|http://h10032.www1.hp.com/ctg/Manual/c04763183.pdf|maintenance and service guide] for the laptop. (I assume that you have a Probook 450 G2 as selected above as the exact model number is not stated in your question).
Go to p.65 to view the necessary pre-requisite steps and then the procedure to remove the power button board. Not quite sure with your model but I think that there is a 6 wire cable connected to the board and that the actual switch contacts are connected to pins 1 and 2. In any event if the button is OK you should be able to find out by placing an Ohmmeter across the connector pins or cable wires (cable unplugged from motherboard) and measuring a short circuit when the button is operated.
''If the button is faulty'' then the board part number is 767442-001. Search online using the part number ''only'' to get results for suppliers that suit you best.
''If the button is OK'' here’s a link to the [link|https://www.alisaler.com/hp-probook-440-g2-la-b181p-rev0-5-schematic/|motherboard schematic] that may help. I’m not sure about this but I think that your model also uses the LA-B181P motherboard. Check the number printed on the motherboard itself to verify.
-If it is the same motherboard go to p.29 and then p.32 (see pin 73) to see how the button connects to the IO chipset to signal the intentions of the user.
+If it is the same motherboard go to p.29 and then p.32 (see pin 73 of chip) to see how the button connects to the IO chipset to signal the intentions of the user.
Hopefully this is of some help.

Status:

open

Edit by: jayeff ,

Text:

Hi @macksho,
Can you force ''turn off'' the laptop by holding the power button operated for >4 seconds?
''If not'' then as the power button doesn’t seem to be doing anything to signal the IO Interface to turn on/off the laptop, try proving that the power button is electrically OK i.e. there is continuity through the switch contacts when operated.
Here’s the [link|http://h10032.www1.hp.com/ctg/Manual/c04763183.pdf|maintenance and service guide] for the laptop. (I assume that you have a Probook 450 G2 as selected above as the exact model number is not stated in your question).
-Go to p.65 to view the necessary pre-requisite steps and then the procedure to remove the power button board. Not quite sure with your model but I think that there is a 6 wire cable connected to the board and that the actual switch contacts are connected to pins 1 and 2. In any event if the button is OK you should be able to find out by placing an Ohmmeter across the connector pins or cable wires (cable unplugged from motherboard and measuring a short circuit when the button is operated.
+Go to p.65 to view the necessary pre-requisite steps and then the procedure to remove the power button board. Not quite sure with your model but I think that there is a 6 wire cable connected to the board and that the actual switch contacts are connected to pins 1 and 2. In any event if the button is OK you should be able to find out by placing an Ohmmeter across the connector pins or cable wires (cable unplugged from motherboard) and measuring a short circuit when the button is operated.
''If the button is faulty'' then the board part number is 767442-001. Search online using the part number ''only'' to get results for suppliers that suit you best.
''If the button is OK'' here’s a link to the [link|https://www.alisaler.com/hp-probook-440-g2-la-b181p-rev0-5-schematic/|motherboard schematic] that may help. I’m not sure about this but I think that your model also uses the LA-B181P motherboard. Check the number printed on the motherboard itself to verify.
If it is the same motherboard go to p.29 and then p.32 (see pin 73) to see how the button connects to the IO chipset to signal the intentions of the user.
Hopefully this is of some help.

Status:

open

Edit by: jayeff ,

Text:

Hi @macksho,
Can you force ''turn off'' the laptop by holding the power button operated for >4 seconds?
''If not'' then as the power button doesn’t seem to be doing anything to signal the IO Interface to turn on/off the laptop, try proving that the power button is electrically OK i.e. there is continuity through the switch contacts when operated.
-Here’s the [http://h10032.www1.hp.com/ctg/Manual/c04763183.pdf|maintenance and service guide] for the laptop. (I assume that you have a Probook 450 G2 as selected above as the exact model number is not stated in your question).
+Here’s the [link|http://h10032.www1.hp.com/ctg/Manual/c04763183.pdf|maintenance and service guide] for the laptop. (I assume that you have a Probook 450 G2 as selected above as the exact model number is not stated in your question).
Go to p.65 to view the necessary pre-requisite steps and then the procedure to remove the power button board. Not quite sure with your model but I think that there is a 6 wire cable connected to the board and that the actual switch contacts are connected to pins 1 and 2. In any event if the button is OK you should be able to find out by placing an Ohmmeter across the connector pins or cable wires (cable unplugged from motherboard and measuring a short circuit when the button is operated.
-''If the button is faulty'' then the part number is 767442-001. Search online using the part number ''only'' to get results for suppliers that suit you best.
+''If the button is faulty'' then the board part number is 767442-001. Search online using the part number ''only'' to get results for suppliers that suit you best.
-''If the button is OK'' here’s a link to the [https://www.alisaler.com/hp-probook-440-g2-la-b181p-rev0-5-schematic/|motherboard schematic] that may help. I’m not sure about this but I think that your model also uses the LA-B181P motherboard. Check the number printed on the motherboard itself to verify.
+''If the button is OK'' here’s a link to the [link|https://www.alisaler.com/hp-probook-440-g2-la-b181p-rev0-5-schematic/|motherboard schematic] that may help. I’m not sure about this but I think that your model also uses the LA-B181P motherboard. Check the number printed on the motherboard itself to verify.
If it is the same motherboard go to p.29 and then p.32 (see pin 73) to see how the button connects to the IO chipset to signal the intentions of the user.
Hopefully this is of some help.

Status:

open

Original post by: jayeff ,

Text:

Hi @macksho,

Can you force ''turn off'' the laptop by holding the power button operated for >4 seconds?

''If not'' then as the power button doesn’t seem to be doing anything to signal the IO Interface to turn on/off the laptop, try proving that the power button is electrically OK i.e. there is continuity through the switch contacts when operated.

Here’s the [http://h10032.www1.hp.com/ctg/Manual/c04763183.pdf|maintenance and service guide] for the laptop. (I assume that you have a Probook 450 G2 as selected above as the exact model number is not stated in your question).

Go to p.65 to view the necessary pre-requisite steps and then the procedure to remove the power button board. Not quite sure with your model but I think that there is a 6 wire cable connected to the board and that the actual switch contacts are connected to pins 1 and 2. In any event if the button is OK you should be able to find out by placing an Ohmmeter across the connector pins or cable wires (cable unplugged from motherboard and measuring a short circuit when the button is operated.

''If the button is faulty'' then the part number is 767442-001. Search online using the part number ''only'' to get results for suppliers that suit you best.

''If the button is OK'' here’s a link to the [https://www.alisaler.com/hp-probook-440-g2-la-b181p-rev0-5-schematic/|motherboard schematic] that may help. I’m not sure about this but I think that your model also uses the LA-B181P motherboard. Check the number printed on the motherboard itself to verify.

If it is the same motherboard go to p.29 and then p.32 (see pin 73) to see how the button connects to the IO chipset to signal the intentions of the user.

Hopefully this is of some help.

Status:

open