Probook G2 not switching on the normal way

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HP ProBook 450 G2

The HP ProBook 450 G2 is a 15.6-inch business laptop marketed toward private and business users.

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Mack @macksho

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发帖于: 2021年5月31日

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Probook G2 not switching on the normal way

Hi my laptop is not switching on the normal way and its also not charging when its off. If you remove the battery and insert the charger it only shows lights on charger, power button, wifi and speaker. These lights just appear for 1 or 2 seconds when inserting charger also when inserting battery. So i managed to figure out how to switch it on when the battery is half inserted. But u have to be quick so that when it flashed those lights when inserting the battery u switch it on. But on charger it doesnt switch on. When the battery is fully inserted it doesn't switch on. If u switch on it works perfectly and it charges the battery. But u cant switch it on the normal way

I have tried to press power button for 1min but it doesnt help. I also watched a video that was talking about falty keyboard, i tried to remove the keyboard but it didn't work. I tried changing RAMs, and changing the charger but it didn't help

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Josh Cook @atomintheworld 声誉积分: 291 12 1 · Answer 1 · 2021-05-31T14:23:54-07:00

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Josh Cook @atomintheworld

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Do you have the correct charger, the charging circuit could be blown or the battery. I would suggest to take it to a nearby repair shop and see if they can troubleshoot it.

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jayeff @jayeff 声誉积分: 450.2千 11 367 1.4千 · Answer 2 · 2021-06-01T01:58:12-07:00

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 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 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 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.

HP ProBook 450 G2

Probook G2 not switching on the normal way

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