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#16
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My SurfacePro 4 won't start!
Wolf K wrote:
On 2018-11-22 17:35, Peter Jason wrote: On Thu, 22 Nov 2018 16:47:35 -0500, Paul wrote: Peter Jason wrote: On Wed, 21 Nov 2018 15:14:11 -0700, 123456789 wrote: On 11/21/2018 1:56 PM, Peter Jason wrote: I've had it on recharge for days. Sometimes it gives a small glimmer, then stops. Is there any way to fix it? Have you tried these (first line in a Google search): https://windowsreport.com/cant-turn-surface-pro-4-on/ Thanks, I just did and I got it started with the suggestion to hold down the start button for 30 seconds. What does that do, officially speaking ? Does it reset some hardware controller on there or something ? Paul I don't know. But it starts OK now. Perhaps the starter-switch contacts are degraded. This can happen to roller-door switch contacts too. I seized the opportunity to download updates going back to July, and there were heaps of them, including Intel & firmware ones. Press and hold for several seconds has also worked for me with desktops that were turned off instead of shut down. Before I used a UPS a couple of reboots after a power outage (-- no proper shutdown) brought Windows back to normal operation. I suspect that Windows does some kind of self-repair and/or cleanup before boot. But that's a hardware conditioning feature for the Power button, at least on desktops. The Power button on the front of your machine is momentary contact, Normally Open (NO). Pressing the button, makes a momentary logic zero on the signal line. The chipset sees the signal, and that would normally kick off startup. The signal is latched. When the circuit is in the "the power is officially off" state, the necessary signal width is very short. Just a pulse on the upper signal is enough. _____ _______ |___| Power control, logic signal _________ |_______ PS_ON# To ATX PSU To protect against your cat pressing the button by accident, once something intelligent is running on the computer, the chipset circuit enters the "the power is officially on" state. To FORCE the power off requires holding the button down for four seconds. _____ _______ |_______________| Power control, logic signal - 4 sec - ___________ __________________| PS_ON# To ATX PSU So this is a pretty consistent behavior, that prevents accidentally brushing against the switch and losing a session. If the button needed only a short "pulse" to turn off the power, then even a flaky wire, one that gave some electrical noise, would be enough. The front panel Reset button on the case, is not conditioned. There's no 4 second timer on that one, although you'd wonder why. The longer time constants (like pressing and holding some button on your router), it's possible those are measured with the processor. The Surface might be doing that. At least some Surface products, use S0iX and don't have the normal ACPI states. Such Surfaces are "always awake" and it wouldn't be a problem to modify the above timing diagrams so that the Surface starts monitoring the Power button when the falling edge of the signal happens. Or, a microcontroller on board could do it, if perhaps battery charging has a management chip, and the Power button is routed through such a controller. But traditional desktops have had that 4 second behavior enforced in hardware. Either the Southbridge or the SuperI/O could have the function, and the function runs of +5VSB. If +5VSB isn't present, the logic that conditions the power button cannot work. The Power button then, is "fly by wire". It isn't a direct control. Whereas the switch on the back of your PC on the ATX supply, that's a direct control. So if smoke is coming out of your PC, *always* use the back switch. If the back switch itself catches fire, pull the cord out of the wall :-) I had a power switch on a computer disintegrate in my hands once, and while nothing bad happened in that case, it could have. If you're one of these people who hides PCs in broom closets, you should always have a means to get at the outlet supplying power, so you can pull the cable in an emergency (before the smoke stinks up the house). I've seen some kiosk installs where you'd have to run for a breaker panel in the event of a fire event, and that's a hell of a time to discover you don't know where the breaker panel is. Paul |
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#17
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My SurfacePro 4 won't start!
On 11/21/18 12:56, Peter Jason wrote:
I've had it on recharge for days. Sometimes it gives a small glimmer, then stops. Is there any way to fix it? is your battery fried? if it's old enough, probably just that. -- (aka 'Bombastic Bob' in case you wondered) 'Feeling with my fingers, and thinking with my brain' - me 'your story is so touching, but it sounds just like a lie' "Straighten up and fly right" |
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