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hp envy x360 15m-ed0023dx won't turn on

My hp envy x360 15m-ed0023dx won't turn on; no lights or screen display or fan noise: completely dead. The power jack lights up when plugged in and I can detect voltages on the motherboard from the power jack to the battery, which also shows power. The one fuse I located (marked fu2) has continuity and the power button* (integrated in the keyboard) checks out good as well. I tried a hard reset a couple of times but no luck. Also tried pulling the ram and replacing one by one. No change. The power supply checks out good. At this point I'm thinking it's a bad motherboard so I ordered one.
This is a little difficult to believe since the laptop isn't even 2 years old. But unfortunately out of warranty.

How I checked the power button


First I separated the palmrest/keyboard assy from the screen. Then I placed a foam rubber "foot" on the power button.

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Then I flipped the assy over so it rested on the "footed" power button which activated it and enabled access to the motherboard keyboard cable. In the picture the motherboard is removed, with the keyboard cable taped down with pin side up. Using a multimeter equipped with needle-sharp (fine-tipped) probes, I tested the pins in pairs (figuring the power button involved two pins) until I discovered the relevant pair, counting from the left pins number 13 and 14, which showed continuity, so the button is good.

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Update after installing supposedly good replacement motherboard. After doing a hard reset, I was able to start it, with fan running but no screen display. However, after managing to start it a couple of times with no display or error beeps, I was unable to get it going again. I rechecked the battery and power supply = both good. I then tried a new power jack, but no difference. I removed the memory and put them back in one at a time, and also no memory at all to see if I could get a beep error, but no luck. At this point I'm perplexed and will go study the service manual to see if there is any secret procedure necessary to start the computer (like, does the back cover need to be in place for it to start?). Will check back later. If anybody has any ideas, I'd appreciate you sharing...

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Hi @PC Techneer

You don't say if you tried connecting both to an external monitor or TV to see if the screen was the problem.

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@PC Techneer

What is the make and model number of the motherboard?

Do you get any indications on the laptop if the charger is connected but the laptop is not turned on i.e. just charging?

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Update: After allowing the laptop to charge overnight I felt the battery and it felt cold to the touch, so I'm thinking maybe the battery is bad, and I ordered a new one and a new power supply as well.

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@aactech The laptop wouldn't turn on, so connecting it to an external monitor wouldn't be helpful, but thanks for your reply.

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@PC Techneer

Desperate times call for desperate measures.

I assume that when you checked the power switch it was for continuity when operated but did you also check if there was a voltage on one side of the switch at normal?

Have checked a few HP laptop motherboard schematics (Not GPC ) but all with no separate RTC battery and what they have in common is that there is still a designated RTC battery circuit in them except the power comes from the main battery and not a separate RTC coin cell battery.

This battery supply rail is known as VCC3SW (the SW is for the power switch circuit).

This voltage supply is fed via a fuse to the power switch but here's the rub. The fuse has a different designation depending on the motherboard although two did mention F38 but this may be just a coincidence

I realize that you have a new motherboard but this may not stop the fuse having been blown when the new motherboard was connected etc, if there was a problem in the power switch power supply circuit somewhere external to the motherboard. Is there a reset button somewhere perhaps on the laptop as the VCC3SW voltage feeds more than the power switch, but mainly different components on the motherboard?

The switch voltage supply is fed from the main battery but again the pin on the battery connector is different although pin 6 rates a mention a few times.

Perhaps you could check if there is a voltage present (I'm assuming 3V since the schematic designation has a 3 in it) on one side of the power switch when the laptop is off. This voltage is applied to the motherboard chipset (south bridge) to turn on the laptop, when the switch is operated

If there isn't a voltage present on the power switch, measure the voltages on the battery connector pins and check if one is 3V.

If there is no 3V on any battery terminal then as you say, it may be a faulty battery. Most schematics show an 11 pin connector to the battery with earth at one end usually pins 10 &11

Really long shot, but maybe this is worth checking out in case it is the same or similar to yours.

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Yes, the black ground wires are at one end of the battery. The battery does show 3+V on one connector, 12+V on 3 of the others. The only fuse that I can locate is the one marked FU2, located above the CPU and right of the fan, and it checks good. I assume by "regular" you mean not activated when you refer to the power switch? I will check for that. If there is a reset button I haven't seen it yet, and I looked on both sides of the motherboard. It would be helpful if HP would make the schematics and boardviews available for their motherboards. So far I haven't found any for this board or a close cousin anywhere online. I hope this board hasn't been ducked up by a bad power supply or battery, but as I said earlier, the power supply is outputting the correct voltage and the battery seems to check okay. You'd think they'd place a fuse somewhere in the charging circuitry to prevent damage from a bad power supply or battery. Usually one is located near the power jack. Obviously SOMETHING is causing it not to start.

A boardview and schematic would make diagnosis a much easier task.

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@PC Techneer

Yes the only thing online regarding the board is a BIOS.bin file which doesn't help since the board won't turn on.

Since you know which 2 pins on the power button motherboard connector are for the power switch then if there is no 3V on either pin at normal i.e. switch not operated, then hopefully you may be able to trace the board track from the connector for each pin to find a fuse. One side should go to the chipset IC, ther other to a fuse (hopefully).

Can't find a close up image of the board online, to see if I can spot anything to help

Cheers

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I have the new battery, but am currently waiting for the new power supply to arrive. I'll get back to it when I have it.

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Okay, checked the PIN 14 of the keyboard which is one of 2 PINs for the keyboard-incorporated power button, and it was showing 2.31V in off state. Also, after applying the new battery and power supply (both of which produced similar voltages as the original), I determined the replacement motherboard must be defective, and so I sent it back. At this point I might try an "Easy-Bake" solder reflow fix on the original motherboard, to see if it has a positive effect on it. Might as well, nothing to lose by doing so.

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I tried an "Easy-Bake" fix but it had no effect, so there must be a bad component(s) somewhere on the board. I went ahead and ordered a new board.

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Somebody asked me if I had connected an external screen to see if that was the problem. Yes, I did that as one of my initial troubleshooting steps, but that didn't indicate anything. I was able to use the original screen to get it going so that wasn't the issue.

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One thing I noticed is that I could get it running when detached from the screen assembly and hooked up to an external screen. But when I attached the screen assembly to it, it wouldn't start. Very odd. As I mentioned somewhere else I managed to get it working again fully assembled but I have no idea why it started working. I was just relieved to be done with the thing. I do have enough parts for further diagnosis, so if I come up with anything I'll let you know.

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