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- Here are some of the common
issues you'll encounter

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with mobile devices.

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The first is no display.

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Well, if you have no display
you can't do anything

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on the mobile device.

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For the laptop, there's several
things that you can check.

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And for the mobile device,

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there are several things
that you can check

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and they're gonna differ a little bit,

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but for both of them you wanna make sure

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that you try power cycling the device

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and also make sure that you
have the battery connected

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for both of these.

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Now, and make sure you
have a charge as well.

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Now for the laptop, you can make sure,

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you can check if it's plugged in

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and see if you get a display

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and then you can check your settings.

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We mentioned that if we
press the function key

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and the F4 key, that we
can change how the monitor

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is displayed from the laptop
to an external monitor,

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maybe it's only displaying
to an external monitor

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and you have to change
that with the function key.

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Another possibility is the
brightness on both of these,

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maybe the brightness is all the way down

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and you're in a very well lit area,

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or the sun is very bright

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and so you can't really see the screen,

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even though it is on,

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so you can check the brightness as well.

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And then finally on the laptop,

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you may have to actually
go in and, you know,

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see if the problem is internal.

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Could be that the flex
connector from the display

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to the motherboard has been disconnected.

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It could be that the
display has indeed gone bad.

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So there's a couple things to check there,

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but generally with no display,

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it's because the device
isn't getting power,

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or it's not on, or the
battery isn't connected,

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that type of thing.

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So check the basic first.

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Then you have dim display.

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Well with this, for both types of devices,

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you want to check the
brightness setting first

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and you know it might be
set to auto like this is,

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and that could cause problems

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when you get into a bright
area as I mentioned before.

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A dim display could also be
because the power is low.

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If you're running on battery

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the automatic power saving settings

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will usually reduce the brightness,

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so that you can still use the
device at low battery power.

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And another possibility is that the laptop

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might have an actual problem.

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It could have a problem with the inverter.

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And we said that you can check that

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with the flashlight trick,
check that with the flashlight

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in a dark room and see if
actually you can see the screen

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a little bit.

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Could be the inverter has failed,

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could be that the backlight is going bad

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and that could cause a dim display.

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And when the backlight fails altogether,

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that would cause a no display error.

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Usually the display itself doesn't fail.

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It's pretty rare unless it's
been really physically damaged.

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And that requires a lot of force nowadays

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to really damage one of
these to the point where

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it won't work at all.

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So, no display, dim display,
always check the basics first.

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Check the power connections.

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Check the battery is connected.

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Check the brightness setting

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and then you can move on to the internals.

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A flickering display.

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Well, flickering display
normally doesn't happen

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on a mobile device

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and it could, but it's rare.

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You might see it on a laptop

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and a flickering display could be a cause

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of a couple things.

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One, it could be because
of the settings in windows.

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You might have a problem.

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The resolution might not work properly

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or perhaps the color depth is too low.

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And the application
you're using will flicker.

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The best thing to do is to
power cycle the devices.

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If you get a flickering
display, that's the first thing.

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And then turn them off, disconnect
them, charge them fully,

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and then restart and see if
you still have the problem.

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And with the laptops
and the smart devices,

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you can go into safe mode,
or you can go to safe boot

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and there you might be see
that, okay, in basic video mode

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you don't get that flickering

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especially on the laptops running windows.

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If you go to safe mode,
you'll be at 640 x 480

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with a low amount of color quality.

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And you might see that
the flickering goes away.

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So you might need to upgrade the driver

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on the laptop or change the
resolution or color settings.

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So a couple possibilities for that.

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It is also possible
that the flex connector

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just has a loose connection.

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And once you make that solid connection,

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you lose that flickering display.

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So a bunch of possibilities with that

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if you have an external monitor

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and that's flickering, could
be because the cable connection

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is loose between the external,

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say the external HDMI or Thunderbolt port

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and the external monitor.

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If you can't display to
the external monitor,

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the first thing you're
gonna wanna do is check

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that function key and F4 on the laptop

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and make sure that you have
the configuration right.

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That's the number one reason
why the laptop won't display

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to an external monitor or projector

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and it holds up conferences all the time

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because you have all
those different options.

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You have the option to
display on the laptop screen,

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or display only on the external monitor

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or stretch the desktop
across to an external monitor

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or copy the display to both.

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So you have to make sure
that that is set properly.

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Then you check the cable connection

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and make sure you're connecting

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to the right port on the external monitor.

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And also on the external monitor,

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if it has multiple inputs for video,

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you might need to manually
select which one you're using

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on the on-screen display on that monitor.

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And you might see that
on a projector as well.

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Now let's say the touch
screen is non-responsive,

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well if you're on a mobile device,

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like a smartphone or a
tablet, that's a problem.

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You're not gonna be able
to do much of anything.

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So again, the power cycles
the best thing to do to start.

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Shut down the device, disconnect
the battery if possible,

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put the battery back in,
charge it up, fully charge it.

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And you know, then see if
you still have that problem.

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Now the touch screen might
be fully non-responsive.

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And you know, in that case,
you do that power cycle

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or you might just have
intermittent problems.

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And if it's an intermittent problem,

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you could try cleaning the screen.

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And then you want to take a look

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at the screen protector that you're using.

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Sometimes they can wear out a little bit.

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Maybe it has failed or maybe
you need a screen protector

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or maybe you need a new one.

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So try cleaning the screen

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and see if that's a possibility for you.

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But again, if you have to,

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go ahead and power cycle the device,

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then you wanna try and do
resets on these devices.

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If you can do a cold reset
and then back up your data,

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you know you might be
able to fix the problem.

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If those things don't work

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you'll have to take it to
an authorized repair center.

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Now as far as the laptop goes,

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the touchscreen can actually be disabled

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on laptops that have a touchscreen.

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So you wanna check that that's enabled

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in the device manager,

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and then beyond that you wanna make sure

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that it is clean and, you
know, it's performing properly.

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And finally sticking keys.

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We're not really worried
about sticking keys

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with mobile devices such
as smartphones and tablets

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because they use an onscreen keyboard.

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And if there was a sticking
key on the onscreen keyboard

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it'd probably just be
because the screen was dirty.

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It would probably just be
because the screen was dirty.

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And so the real issue
here is with laptops.

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If you have one sticking key,

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could be because the key was
damaged, physical damage,

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or it could be because
someone spilled some coffee

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or soda on there.

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And a lot of times you could just clean it

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and it'll fix the problem.

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You can use a little
bit of that, 50/50 mix

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of isopropyl alcohol and water

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and really clean the key good

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and press it a couple hundred times

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while cleaning it to see
if that fixes the problem.

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If it doesn't, then you know
you're gonna have to go in

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and open up the laptop,
pull the keyboard out,

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and then maybe you can
clean it at that point

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because, you know, here you
can get little bits of coffee

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and soda and whatever in the
crevices around these keys.

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And so if you take the whole keyboard out

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you could clean the whole thing carefully

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and then put it back in.

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And if not, you'll have
to replace the keyboard.

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So there's a little bit
of a troubleshooting

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common mobile device issues.

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The display issues and the keyboard issues

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and the touchscreen and touch pad issues.

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Those are fairly common,

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but always check the basic stuff first.

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Always check the common culprits.

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Make sure the battery's connected.

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Make sure you've tried
power cycling the devices.

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Make sure you have power
to the laptop if necessary

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and use those function keys

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to check the if you're working
with an external display

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and check the brightness
and that type of thing.

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So that's it for this sub lesson.