Admiral208 Posted November 15, 2011 Posted November 15, 2011 I have aquired a HP G62 laptop that wont power on. I have tested the charger and that is fine. I have replaced the small power button board that plugs into the main motherboard. the motherboard is getting power from the mains. Is there a way of turning on a laptop without using the power button? I know you can do it with a desktop by bridging a couple of jumpers. I have tried it with and without the battery and still nothing? Does anyone have any suggestions of things to try? Its a good laptop and i would love to get it working.
difinity Posted November 16, 2011 Posted November 16, 2011 Check for damaged USB ports, i've had laptops and PCs that won't turn on due to a shorted pin. 1
difinity Posted November 16, 2011 Posted November 16, 2011 Try removing the hard drive and cd/dvd rom before tying the power on. I've also had a laptop that didn't do anything and that was due to a dead hard drive. 1
jamesfed Posted November 16, 2011 Posted November 16, 2011 Weird thing I've had in the past (most often with Acers never had an issue with a HP) is remove the battery - press the power button for a few seconds (no power cable in), then replace the battery + cable and power on 1
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 Check for damaged USB ports, i've had laptops and PCs that won't turn on due to a shorted pin. I haven't checked this yet but I will do. Try removing the hard drive and cd/dvd rom before tying the power on. I've also had a laptop that didn't do anything and that was due to a dead hard drive. I have removed all drives and tried but still nothing. Weird thing I've had in the past (most often with Acers never had an issue with a HP) is remove the battery - press the power button for a few seconds (no power cable in), then replace the battery + cable and power on Already tried this.
Oaktech Posted November 16, 2011 Posted November 16, 2011 have you tried booting it off the charger with no battery installed. we've had a g62 with a battery fault that wouldn't turn on with the battery installed. 1
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 have you tried booting it off the charger with no battery installed. we've had a g62 with a battery fault that wouldn't turn on with the battery installed. Yep. Tried that too
crt404 Posted November 16, 2011 Posted November 16, 2011 I take it that there are no 'helpfull' diagnostic beeps? 1
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 I take it that there are no 'helpfull' diagnostic beeps? No. Nothing
HarryMonkey Posted November 16, 2011 Posted November 16, 2011 Could be that the battery is dead. I've had laptops that won't even boot off the mains if the battery is dead. 1
laptopsandspares Posted November 16, 2011 Posted November 16, 2011 Morning, Couple of questions. 1) When you plug the charger in, are their any led's near the DC jack that light up at all? White or blue? 2) Do you get any action from it at all? Initial drive or fan spin for examplebefore non-boot or does "dead" mean just that. Nothing!! I've had repairs in on similar HP models that have had power button board failures although, on the jobs I've seen, you usually get an indication from the LED near the DC jack, and or a faint light from the power button board LED when you plug the charger in. Occasionally, if you plug it in, and leave it 10 or 15 seconds before jumping on the go button, you sometimes get a small whir before returning to it's dormant state D 1
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 anyone got any good guides on testing the battery with a multi meter?
laptopsandspares Posted November 16, 2011 Posted November 16, 2011 anyone got any good guides on testing the battery with a multi meter? You'd need a schematic (ideally) to identify which pins on the battery contact do what. That said the battery honestly shouldn't affect a machine booting from the mains. They've not been wired in series for about 100 years. If the battery is not in the laptop it can't affect the boot process anyway so if you haven't already, take it out and try a boot (but again, it really shouldn't make any difference unless you have charging circuit issues) D 1
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 Morning, Couple of questions. 1) When you plug the charger in, are their any led's near the DC jack that light up at all? White or blue? 2) Do you get any action from it at all? Initial drive or fan spin for examplebefore non-boot or does "dead" mean just that. Nothing!! I've had repairs in on similar HP models that have had power button board failures although, on the jobs I've seen, you usually get an indication from the LED near the DC jack, and or a faint light from the power button board LED when you plug the charger in. Occasionally, if you plug it in, and leave it 10 or 15 seconds before jumping on the go button, you sometimes get a small whir before returning to it's dormant state D 1. When I plug in the charger, there is a bright white light that comes on. It then turns red to indicate (I guess) that the battery is charging. If i take the battery out and plug in the charger, it stays a constant white. 2. There is nothing. Its completely dead. You'd need a schematic (ideally) to identify which pins on the battery contact do what. That said the battery honestly shouldn't affect a machine booting from the mains. They've not been wired in series for about 100 years. If the battery is not in the laptop it can't affect the boot process anyway so if you haven't already, take it out and try a boot (but again, it really shouldn't make any difference unless you have charging circuit issues) D I agree. Although I am completely stumped with this one. I am willing to try anything.
laptopsandspares Posted November 16, 2011 Posted November 16, 2011 Ok with the above in mind, I think it's the power button board. If it was mainboard related you'd expect beeps, fans spinning or some sort of action and you've tested the AC. Can't be 100% but it's a very similar set of cirumstances to other jobs like this I've seen. From the HP manual the board number is 595204-001, maybe have a look on "The bay", ALT code from HP is 600434-001 see if you can pick up a cheap one? (HP are showing no local stock) There are lots of firms in the trade "breaking" for spares too. You don't want to spend too much on a speculative repair I suppose. I'm not totally sure bit it might be possible to bypass the board with a screwdriver but they are normally pretty small parts on a ribbon or fly lead, I'd not fancy your chances much of making the right contact D
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 I came to the same solution. I have replaced the board already with one from ebay (I did mention in the original post). The problem is how can I test it?
laptopsandspares Posted November 16, 2011 Posted November 16, 2011 I came to the same solution. I have replaced the board already with one from ebay (I did mention in the original post). The problem is how can I test it? Sorry, totally missed that didn't I? can you get a volt meter on the mainboard end of the power button board to see if the power is getting through the board? (not sure how small the contacts are but I'm guessing this might not be possible.) Trawling the manual they have pin config diagrams for all the external connectors but nothing for the internals which is a shame. I'd think though, unless you've been unlucky with a second failed board the replacement might suggest we've both arrived at the wrong conclusion.
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 I have managed to put a multimeter on the motherboard where the powerboard connects and it has a voltage of ~4v. I have tested at the top of the power board and im getting the same result. The picture shows the mainboard and the power switch board. Where the mainboard joins the power board, there are six connectors. from left to right, If i bridge connectors 1 and 2 the led on the power board lights up so I know power is getting through. Could I be unlucky enough to have 2 faulty switches? Does the switch on the powerboard just create a circuit between the remaining 4 connectors? If i were to bridge the 4 from the right, would that do the same as pressing the button on the power board?
laptopsandspares Posted November 16, 2011 Posted November 16, 2011 You might be the unlucky guy with two faulty switches, but it does sound like power is going through the board. Same laptops do tend to develop the same faults so if it's a weak link a second dead one is possible but hard to be sure. Re shorting the pins, I'm probably outside my field of expertise at board level (I can swap stuff and sometimes . Following logic if there are 6 connectors, I'd think it's 3 pairs but how you'd tell...... Maybe other Geekers are better placed technically to answer this? 1
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 ok, ive just tested the cmos battery and it was dead. volt meter measure 0.01 for a 3v battery. So ive replaced that but still no joy! Would a dead motherboard battery make a difference to it not starting anyway?
laptopsandspares Posted November 16, 2011 Posted November 16, 2011 ok, ive just tested the cmos battery and it was dead. volt meter measure 0.01 for a 3v battery. So ive replaced that but still no joy! Would a dead motherboard battery make a difference to it not starting anyway? Not normally. The old IBM 600 series used to ask you to reset the time and date on every boot when the CMOS batteries got old and eventually it would get so tired it would restart straight away and then ask for the time and date again! There was some life though when you hit the go switch. Anyone else feel free to correct me on this but even with a dead CMOS you should see some action and not complete darkness.
markcuk Posted November 16, 2011 Posted November 16, 2011 put the mainboard in the oven for 8-10 minutes on 180. Seen it on youtube:D 1
Admiral208 Posted November 16, 2011 Author Posted November 16, 2011 thats actually a great idea. Ive done it in the past with a printer that stopped working here. Ill try it tonight and see what happens.
jinnantonnixx Posted November 16, 2011 Posted November 16, 2011 (edited) Could be do to with the nvidia defect. The Nvidia Defect Forum Certain laptops using the Nvidia graphics chips overheated. HPs were especially prone. I successfully replaced a three-year old laptop for a new one at Staples as it fell under the sale of goods act which covers manufacturing defects for five years. In a nutshell, because nvidia provided chips which were out of the specified heat tolerances for the boards, they created a product with an inherent defect. The above link explains it in detail and how to go about getting a new laptop. Edited November 16, 2011 by jinnantonnixx
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