I've tried the 30/60 second thing with battery etc still nothing. i've managed to hook up another screen and can see everything on the laptop. can anyone help me to work out why my screen is still balck. it does come on at the begging then goes black.
Diagnose:
The diagnosis is;
1) Graphics Chipset
2) Video Cable
3) screen Inverter
4 Backlight
5) LCD screen
If upon diagnosing with an external monitor, you find the display is good on the external monitor, the graphics chipset is good.
Next in line is to check the Video Cable.
Acer = LCD Cable for Video Cable
The connection on the motherboard side is checked first. Then the connection on the LCD screen side.
Seems redundant I know to use this sequence, as to check the LCD Cable connection on the LCD screen side, you have to remove the Display Assembly.
Means you have to disconnect the motherboard side of the cable. (For one)
But at this point you are just diagnosing.
The motherboard connection side of the LCD Cable, is easily accessed after removing the Middle Cover.
The thin strip of plastic above the Keyboard, and below the LCD screen.
(LCD Module actually)
All it takes is a very slight disconnection of the cable. You won't be able to discern it visually. The method is to see if the cable's plug, will plug in tighter.
Both on the motherboard side, and the LCD screen side.
The LCD Cable routes through the left Hinge, and into the LCD Module. (Display Assembly)
It could have been pinched, which would have pulled on it when opening the laptop. Could have pulled one, or both of those connections loose.
Look for obvious signs of damage to the sheath of the cable.
ANY visual damage, may mean damage to the tiny wires inside the cable.
Stretched/Broken wires.
However the wires inside may be damaged, with no outward visual signs apparent.
This would then require removing the LCD Cable, and performing a continuity check with a multimeter set to Ohms, for each wire in the cable.
(If you want to positively ensure that the LCD Cable is not the problem)
(An economical multimeter can be purchased for as little as $8 to $12.
Available in a multitude of stores. An auto parts stores is but one example.
Analog or digital is fine )
Or just replace the cable if visual signs of damage warrant it.
http://www.amazon.com/Video-Flex-Cable-Aspire-5735Z/dp/B006WP5ZF2
The LCD Module has to be removed, to check the LCD screen connection side.
LCD Cable checks out? Move on to the screen Inverter.
Primer:
An LCD screen cannot produce light by itself,
http://solutions.3m.com/wps/portal/3M/en_US/Vikuiti1/BrandProducts/secondary/optics101/
It needs an additional light source.
A Backlight is the additional light source.
A Backlight can be a CCFL, or a series of LED lights.
The Acer Aspire 5735Z uses a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
(Average size is 2mm Thick, by near the height of the LCD screen.
That is a little more than 1/16th of an inch Thick, and around 7 inches Long, for the Acer Aspire 5735Z with a 15.6 Inch LCD screen.
Yes sir. Breaks very easily) )
The screen Inverter converts power (Electricity) from the laptop, for the Backlight, and LCD screen.
90 PERCENT OF THE TIME the fault is a bad Inverter.
To test a screen Inverter requires a sensitive multimeter. Read fairly expense,
http://www.fonerbooks.com/test.htm
Due to the above, the ease of replacing, and the cost, most consumers just replace it.
(Unless you have access to someone with a sensitive multimeter. I despise
parts changers, and don't like to guide someone using this method. However...)
http://www.micier.com/acer-aspire-5535-5735-5735z-5730-inverter-board-1921066002-dac08n011_p798.html
LCD Cable is good, Inverter checks out, or is replaced, and problem still exists?
Backlight.
http://www.ebay.com/itm/15-6-LCD-CCFL-Backlight-Lamp-Bulb-for-ACER-Aspire-5732ZG-5734Z-5735-5735Z-/220886560386?pt=LH_DefaultDomain_0&hash=item336ddd6e82
The above is just an example. Not advertising.
http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/
The next step is the LCD screen.
Some do not wish to attempt replacing a CCFL backlight, and replace the LCD screen. It has the Backlight already installed.
If you do not see any readily apparent damage to the LCD Cable, and it doesn't have any loose connections, my money is on you have a bad screen Inverter.
The plastic thin frame in front of the LCD screen, and surrounds the LCD screen like a picture frame, is the Display Bezel.
Acer = LCD Bezel.
The screen Inverter board is mounted behind the LCD Bezel, and towards the bottom of the LCD screen.
Link to a free Service Manual following in a Comment.
http://www.tim.id.au/blog/tims-laptop-se...
Go down to the 'paragraph' that starts with - Aspire 1200. (1200 in Blue)
Drop down to the 9th line, scroll across, and click on - 5735Z
After you click on the file name (5735Z) it may take up to 30 seconds, before the first page comes up.
(Took 10 seconds, using medium speed DSL connection, and Adobe Reader X )
Disregard the following if you are aware;
This is a PDF file. The computer you are using now has Adobe Reader on it. which uses PDF files.
IF the computer you are using does not have the latest version, I would download Adobe Reader X. (10)
At the top of the PDF file is the page number box. It is to the Right of the Down Arrow.
The PDF file page numbers, do Not match the service manual page numbers.
Reference to page numbers will be for the PDF file.
If you know the page number you want, you can use the Down Arrow to arrive at it, or;
1) Put your mouse cursor in the page number box. Left-click once.
(Anything in the page number box will now be highlighted in Blue)
2) Type the page number.
3) Press the Enter key.
The view size can be increased for more clarity, and decreased, in size.
The Zoom In icon at the top, ( + ) increases the view.
The Zoom Out icon ( - ) decreases the view.
A) Removing the Middle Cover; Page 72.
B) Removing the Keyboard; Page 73
C) Removing the LCD Module: Page 77. Starts at the bottom.
D) LCD Module Disassembly Process: Pages 97 through the top of Page 103.
You are just accessing the back of the LCD screen, for the LCD Cable connection.
Use Pages 98 through the top of Page 99 for removing the LCD Bezel, to access the screen Inverter.
Work on a table. If the table is on a carpeted floor, refrain from swinging your feet.
It would be best to buy, and wear an ESD wrist strap. Have it's alligator clip connected to a good ground source, also.
Your body carries Static electricity.
Static WILL fry out (Short Circuit) the delicate hardware components, inside a computer.
Wear an ESD wrist strap, with it's alligator clip connected to a good ground source, and your laptop is SAFE.
An average decent ESD wrist strap runs about $3 to $6.
Pretty cheap insurance.
Here is but one example,
http://www.radioshack.com/product/index....
[ I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case.
Not everyone has one of these laying around.
(No need for an Anti-Static Mat, and I don't want my wrist connected to the local, yokel utility company's ground source)
If the table you are working on has metal legs, connect to an unpainted surface of one of them.
You can also connect to a large metallic object, and sit it on the table.
Perhaps a large metal serving tray, (Bare metal), or large metal knickknack. (Unpainted)
A lot to absorb. I just hate to see someone pay big $$$$ to a repair shop, if the problem was just a slightly disconnected LCD Cable, or bad screen Inverter.
For additional questions, and/or to have me clarify anything I have stated, post in a Comment.
Regards,
joecoolvette
×
It only means that either the Inverter Cable/LCD cable or the LCD itself is defective, because if you still see the contents of the laptop to an external monitor, then it means that the rest of the computer's components are working.
You can have the Inverter Cable reseated or have the LCD screen replaced. Have it tested by a local technician.
Testimonial: "thank you, thought as much"
1,320 views
Usually answered in minutes!
×