Find out easily if the problem is with the Display Assembly, or the integrated graphics chipset on the motherboard.
[ A) When I refer to the Display Assembly, the reference will be to only the parts needed to repair. Not the entire display assembly.
Only the LCD screen, or screen Inverter, or Backlight.
B) The graphics used for a Compaq Presario CQ60-220US Notebook PC, is an Intel GMA X4500 graphics chipset.
It is Integrated Graphics.
The graphics chipset { GPU } is soldered directly to the motherboard, via a BGA surface mount.
1)
http://en.wikipedia.org/wiki/GPU2)
http://en.wikipedia.org/wiki/Ball_grid_array3)
http://en.wikipedia.org/wiki/Intel_GMA#GMA_X4500Chip and Chipset are slang terms for I.C.
Integrated Circuit ]
A) Laptop OFF, monitor OFF, attach a VGA monitor to the VGA port on the Pavilion CQ60-220US Notebook PC.
(The VGA port is on the Left side as you face the laptop. Third port from the back. Color may be different, but this is an example of a VGA cable, and VGA port, { Connector },
http://en.wikipedia.org/wiki/VGA_connector )
You can use a VGA monitor, (CRT. Looks like a small TV), or a flat LCD screen with a VGA cable.
Monitor plugged in, turn the monitor on. If a CRT model allow the monitor to warm up.
Turn the laptop on.
By default, the external monitor, (VGA monitor), should show what the internal monitor of the laptop, does.
IF not, press, and hold down on the Fn key. (Bottom row of Keyboard keys. Second key from left)
While holding down tap on the F4 key at the top of the Keyboard.
You may have to tap more than once.
There are at least three settings;
1) Notebook internal monitor ONLY
2) Notebook internal monitor, AND external monitor
3) External monitor ONLY.
IF, the external monitor shows exactly the same problem as the internal monitor of the laptop, the problem is the Graphics Chipset.
Unless you have access to a BGA rework machine, and the graphics chipset, it means replacement of the motherboard.
(Cost of replacing graphics chipset, versus motherboard replacement, a motherboard replacement may prove to be more cost effective )
If the graphics are fine on the external monitor, your problem lies within the Display Assembly.
Could be the LCD screen, or screen Inverter, or Backlight.
Primer:
An LCD screen cannot produce light. It needs an additional light source.
The additional light source is the Backlight.
A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
A screen Inverter is used to convert the electricity, (Voltage and Hertz), of the laptop, for the LCD screen, and Backlight.
90 PERCENT of the time the fault is the Inverter
An LCD screen is made up of layers. These layers are held in place by a screen Frame. Resembles a picture frame that comes apart, and is made of metal.
The Backlight is incorporated within the inside of the frame, and next to the layers making up the LCD screen. (Some models have more than one Backlight)
http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/
For this reason, it is not a task for those who do not have the skills.
The LCD screen layers MUST be kept in the Exact same position, as they were from the factory.
One small misalignment, and your LCD screen is useless.
Due to this, and many who can easily perform replacing an LCD screen, the LCD screen, and Backlight are sold as one unit.
However, the screen Inverter is more easily replaced. It is located behind the Display Bezel, and attached at the bottom of the LCD screen area.
(The plastic front frame around, and in front of the LCD screen, is the Display Bezel. Resembles a thin plastic picture frame )
The screen Inverter is also MUCH more cheaper, than an LCD screen/Backlight replacement.
One example of a screen Inverter, for a Compaq Presario CQ60-220US Notebook PC,
http://www.battery-adapter.com/product_info.php/products_id/3763/vCQ50Reasons I would recommend an average user to replace the screen Inverter, (If the display is okay on the external monitor),
A) Diagnosing the screen Inverter; Diagnosing whether it is bad.
Requires an Expensive multimeter that is Very sensitive.
B) 90 PERCENT of the time the fault is the Inverter
C) Cost
Assuming you do not have an expensive/sensitive multimeter, it is down to just being a parts changer, of a sort.
Due to the price, ratio of this part being the problem, and ease of replacing, this is a no brainer item to replace first.
To summarize;
A) IF, the display on the External monitor is the same as the Internal monitor of the laptop, a replacement motherboard is in the future.
(You yourself can replace. Read on)
B) IF, the display on the external monitor is good, then you may wish to replace the screen Inverter.
C) Replacing the screen Inverter does not repair the problem?
LCD screen with Backlight is next.
HP Support > Compaq Presario CQ60-220US main page,
http://h10025.www1.hp.com/ewfrf/wc/product?product=3860108&lc=en&cc=us&dlc=en&lang=en&cc=usClick on Manuals
Scroll down, and click on -
Compaq Presario CQ60 Notebook PC HP G60 Notebook PC - Maintenance and Service Guide
This is a free Service Manual from HP, in PDF file form.
Disassembly/assembly is in the manual.
[ Disregard the following if you are aware;
The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the link on HP Support, it may take up to 30 seconds before the first page comes up.
I recommend upgrading ( Free) to Adobe Reader X { 10 } if the computer you are using, does not have this version on it ]
For addditional questions please post in a Comment.
Regards,
joecoolvette
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