SCHEMATICS / SERVICE MANUAL ACER ASPIRE 1360 SERIES: ASPIRE 1360, 1362LMI, 1362WLMI, 1363WLMI, 1362XC, 1362LC, 1362LCI, 1362WLC, 1362WLCI
ACER ASPIRE 1520 SERIES: ASPIRE 1520, 1522LMI, 1522WLMI, 1524WLMI, 1522LC
Wistron Block DiagramModel:WISTRON EGRET - DISCRETE 135W - REV SCWISTRON EGRET - DISCRETE 90W - REV SCWISTRON EGRET - UMA 135W - REV SCWISTRON EGRET - UMA 90W - REV SCWISTRON EGRET - VGA AGP - IWISTRON EGRET - VGA AGP - IIWISTRON EGRET - VGA AGP - IIIWISTRON EGRET - VGA AGP - REV SAWISTRON EGRET - VGA AGP - REV SBFile type: pdfPages: - pagesSupport model:Acer Aspire 1360 series: Aspire 1360, 1362LMi, 1362WLMi, 1363WLMi, 1362XC, 1362LC, 1362LCi, 1362WLC, 1362WLCiAcer Aspire 1520 series: Aspire 1520, 1522LMi, 1522WLMi, 1524WLMi, 1522LC
Wistron EGRET Schematics
Download schematics:
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Black Screen in ACER Laptops
An ACER E5-474 laptop was sent in for repair.
It had a flickering screen but later developed into a black
screen that occurred randomly especially when one tried to move the
laptop around with the screen
activated.
There are
many posts found in the web recommended how to fix this black screen
problem. They are not only for ACER laptops but also for other
brands. Generally, the following fixes were recommended:
a) Power down the Laptop for a few second, then power it up and at the same time, pressing [F2], [F9] and
[F10], followed by a [Enter] key, one by one in
sequence. With some luck, the screen will come back on to life;
b) Remove the power adapter and also unplug the
battery. Wait for about 60 seconds and
reconnect the battery and the power adapter; hopefully, everything will be back to normal. Usually,
this works like magic. Acer
laptop even has a pin somewhere at the back of the laptop
where one can reset the battery if the battery is in-built and not the
detachable type;
c) Replace the BIOS by downloading the BIOS to a
thumb drive and plug the drive to an USB port. Thereafter, start the laptop by pressing the [ESC], [Fn] and [Power] keys all at the same time
for a few seconds and then release the keys.
wallah! The screen is always shown back to normal.
There are also other fixes that
did not quite work out.
The laptop's screen came back after performing method a) but it did not last long and the screen went black after sometime. Removing the battery worked better but suffered the same fate. After some time, none of the methods worked.
The laptop's screen came back after performing method a) but it did not last long and the screen went black after sometime. Removing the battery worked better but suffered the same fate. After some time, none of the methods worked.
What are They Doing?
In all
these fixes found in the Web, there is
one thing in common; none of them could explain
properly what they were doing and also,
there was no guarantee that this
black screen problem would go away. The method about replacing the BIOS has some
substances. At least it replaced and reset something in the laptop.
What was the Actual Problem?
After
having gone through all the fixes except for the replacement and updating of the BIOS, one would get a conclusion that there was actually
nothing wrong with the laptop. May be
the black screen was just a resetting problem and the flicking screen got something to do with dirty VGA port.
Why a Resetting Problem?
The screen
flickering and black screen problem just went away after we removed the
battery
for about 10 to 15 minutes. This could have reset the BIOS. At the
same time, we clean up the laptop’s input and output connection
ports with a
tooth brush and WD40 cleaning fluid. We paid particular attention to
the cleaning of the VGA port for which reason we will explain later
After
switching the laptop back on, we noticed
that the BIOS reset itself as we no longer able to boot into the Windows Installation Disk
using the DVD drive as we did before.
We also
made sure that the screen setting was set to [PC screen only] as we suspected
the user could have forgotten to reset the screen after running in [Duplicate]
or “projector” mode. Therefore, if the
bare and exposed VGA port is dirty and active, it might cause 'short circuiting', disrupting
the screen’s operation.
How Do We Know if the Laptop is now Working?
We retraced
back the step that we have taken before the screen flickered and went completely black. One of the steps is to enter the Windows’
recovery mode from the sign-in screen where we would press and hold the [Shift] key and restart the laptop by
selecting [Restart] from the power button as shown attached. Now the laptop performed this function without a hitch.
What is the Take Away?
a) New and Modern Laptops not made for DIY users
1. The new laptops, ACER in particular. are no
longer made for DIY users as they have
a) In-built the battery and no longer made it
removable for troubleshooting;
b) Concealed the RAMs and CMOS battery located underneath the motherboard making them
not accessible for upgrading and repairing the laptops
c) Not provide much information about how to
troubleshoot the technical problem
Fortunate
enough, the ACER laptops have a small
hole at the bottom where one can reset battery should there be a need to do so
(Note that there is also a small hole
near the keyboard for ACER E5-474. This is
for microphone, please do not insert any pin to
damage the microphone)
b) Confusing Keyboard Functions
Many
function keys are provided for the convenient of the users at the touch of keys
such as turning on and off the Wi-Fi,
changing the mode of screen display, turning on and off the touch pad
and speaker etc. For ACER laptop, there is no warning sign or light to tell if
these functions are turned on or off;
so, an active VGA port could well have caused the black
and flickering screen if the VGA terminals are dirty
What Best
To Do in Future?
Step by
Step
Description
|
Action
|
Remark
(doubleclick to enlarge)
|
1. Reactivating the screen
|
Try
reactivate the laptop by pressing F2,
F9, F10 and [Enter] keys in sequence.
Try also other methods as recommended by the Web
including removing the battery or resetting the battery etc
|
Nothing
can be done if the screen stays black
|
2. Resetting the BIOS
|
With the screen activated and laptop starting, press [F2] key and then reset the BIOS to default value
|
Hopefully, this will restore all the settings
 |
3. Ensuring VGA port is turned off
|
By
pressing [Fn] and [F5] key and select [PC Screen only]
|
 |
4. Cleaning up the VGA and other input/output
ports
|
By using
tooth brush and clean fluid such as WD40
|
Doing a
spring cleaning to ensure dirty ports are not problem
|
.
Should we do a BIOS Replacement or Update?
It is never
recommended unless one has other problems with the laptop. If the laptop is still working with hard disk
humming and the keyboard responding, one would risk to “brick”
the laptop by performing a BIOS update especially with a black screen.
What about re-installing the Windows?
This should
be taken as a last resort as the installation will wipe out all the data store
in the hard disk and recovery of such information might be a painful process.
To Remove the CMOS battery?
Removing the
CMOS battery will reset the BIOS. However,
for new and modern Laptops, this CMOS battery is located under the motherboard and is
unreachable unless one is prepared to dismantle the laptop to unsolder the battery terminals.
What about Connecting VGA port to an External Monitor?
This should be one of the recommended steps to check if the laptop screen is working. It can be done easily if one has an external monitor. Should the external monitor have image or picture showing up after toggling [Fn] and [F5] keys, it is likely that laptop screen is faulty. On the other hand, if both screens stay black, the laptop would need further repair and troubleshooting or a reset.