Question about Sony VAIO SZ VGN-SZ340P5 PC Notebook

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LCD damaged The LCD display got damaged when it was dropped. I'm trying to use it connected to my flat screen monitor but message on monitor says no signal.

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You have to press Function and F5 and make sure that it uses the external video card and its wired etc

Posted on Aug 11, 2008


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Screen comes on with loads of colouerd lines

Suggest you diagnose, and see if the problem is in the Display Assembly, Video Cable, or graphics chipset.

1) Laptop OFF, monitor OFF, attach a VGA monitor to the laptop.

Since you didn't post the model number of the laptop, (Is it an MSI laptop also?), I can only post generic information.

This is an example of a VGA connector, and a VGA cable,

You can use a VGA monitor that is the CRT style, (Looks like a small TV), or a flat LCD screen monitor that has a VGA cable attached.

Monitor connected to laptop turn the monitor on. If a CRT style allow it to warm up.
Turn the laptop on.

By default the display should show on the external VGA monitor.
If not, press, and hold down on the Fn key, and tap the Display toggle-over key.

[ The Display toggle-over key is one of the Function hotkeys at the top of the Keyboard. It may be F4, or F5 for example. The key will have a monitor symbol on it, and perhaps an arrow pointing to the side ]

If you hold down on the Fn key, and tap the Display toggle-over key once, and nothing happens, hold the Fn key down again, and tap once more on the Display toggle-over key.

There are at least 3 display options available,
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY

If the display is still the same on the external VGA monitor, as it is on the laptop's internal monitor, you have a bad graphics chipset.

A) IF, the display is Fine on the external monitor, you have a problem with the Display Assembly, or the Video Cable.

B) IF, the display on the external VGA monitor is the same as the internal monitor of the laptop, you have a bad graphics chipset.

I have not seen any service bulletins stating problems with graphics chipsets, or the mounting of the graphics chipset, for MSI laptops/netbooks.

If the graphics chipset is bad you are looking at a motherboard replacement.

Video Cable:
This flat ribbon cable connects to the motherboard, goes up under the left Hinge, (Probably), and connects to the back of the LCD screen.

From opening, and closing during everyday usage, the video cable may have been pulled on, causing damage to the cable. Or pulled it loose from the motherboard connection, or LCD screen connection.

Dropping the laptop will also pull on the Video Cable, if the laptop was open when dropped.

[ The Video Cable plugs into the motherboard, and plugs into the back of the LCD screen. This is an example using an HP dv4 series of Notebook PC,

Scroll down to Step 19, to see an average Video Cable, and how it connects to the back of the LCD screen.

[ I posted a solution earlier to a problem similar to this, and the asker found the Video Cable was loose on the back of the LCD screen,

The connector on the other end of the Video cable, that plugs into the motherboard, is similar to the LCD screen connector ]

ALL power is removed from the laptop. AC adapter (Charger) and Battery. Anti-Static Precautions are followed.

Then the laptop is partially disassembled down far enough, to see if there is obvious damage to the video cable on the motherboard side, and/or if the connection of the Video Cable to the motherboard is loose.

Look at the sheath of the video cable, and see if there are obvious signs of damage. Damage to the sheath of the cable, may be an indication that the tiny wires inside the cable, are damaged. (Stretched/Broken)

To test the Video Cable to see if it is good, the Video Cable needs to be completely removed, and a continuity test performed.

{A multimeter is set to Ohm's. Each wire is checked in the Video Cable to see if electricity will flow through it. Continuity.
If not the wire is broken.

An economical multimeter that will suffice for this test, can be purchased for around $5 to $12. Available in a multitude of stores. An auto parts store is but one example. Analog, or digital is fine.

If this is not feasible, and/or the knowledge to use the multimeter is not available, ( I can guide you, however ), perhaps take the Video cable to the nearest computer repair shop, and have them check the continuity }

Video Cable connections prove to be tight on the motherboard side, AND on the LCD screen side, go to the screen Inverter.

An LCD screen does not produce light. (Or not enough light)
An additional light source is needed.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED lights.
Don't know the model number of your MSI (?) Notebook PC, or I could tell you which Backlight technology your laptop uses.

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

(Average size of a CCFL is 2mm Wide, and 334mm Long. That is approximately a little thicker than 1/16th of an inch Wide, (.078 thousandths), and a little over 13 inches Long)

A screen Inverter is used to convert the power (Electricity) from the laptop, for the Backlight, and LCD screen.

A screen Inverter is a small circuit board located behind the Display Bezel, (Also referred to as Display Mask), and at the bottom of the LCD screen.

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter

My thoughts are that you have either a bad connection for the Video Cable, and/or it is damaged, OR you have a bad screen Inverter.

I have access to Service Manuals for MSI Notebook PC's, but only certain models.
However post the model number, (Located on the Bottom of the laptop, in a white service tag, or sticker), in a Comment.

After you have disassembled enough laptops, Julie, they all seem to follow the same basic disassembly pattern.
We'll see what we can do.


Jan 16, 2012 | MSI Computers & Internet

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LG L222WS half bottom screen white

There is a problem with the capacitors in your monitor. This is a normal problem these days with flat screen monitors, I am trying to find out why it is always like tha. This will normally be caused by improper shut down or power fluctuations in your monitor. Capacitrs in your monitor are responsible for holding down the power from the supply, fr the proper display on your monitor. If a capacitor is damaged, or buldged, it no longer holds power long enough for your display, and that is why your screen goes black after a few seconds. This can be solved by opening up your monitor, using a sharp and flat object, opening it starting from the bottom working your way up until the cover is completely out. You will notice finger-like clips that are holding the two covers together. Once you are done, check on the circut board where you connect the power cable.... that is where you are going to find the damaged capacitor(s). You can identify them by noting their bulged head or if there is any liquid coming out of it. Before you replace the, take note of the polarity (+) and (-) so that whenever you replace with the new one it is in the same direction. This will fix up your problem. Note: make sure you let a Computer Technician to do this for you, unless you can do it yourself without damaging the monitor. Thank you

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My Problem w/ my Toshiba Satellite P105-S9337 model no. PSPAGU - OOJOOV is it has a strip of white line vertical on the screen and it's about 1" thick? is their a way I can fix this problem?

Connect an external monitor to the VGA port on the computer. If that display is correct, then it's probably the LCD screen on your laptop that is damaged.

Find a computer-store. They may have "pre-owned" LCD screens the same size, for about $100.
A "brand-new" LCD screen is at least $200.

Replacing the LCD screen is *NOT* something that *YOU* can fix, unless you're a qualified technician.

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This message "safe mode press any key" sounds more like the problem is in the PC. You need to try another monitor with this PC, also try the monitor with other PC. Need to narrow down the problem first. Plase post back.

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the LCD screen is damaged.

hope this helps

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If the monitor was dropped, most likely you damaged the internal components that provide the picture, whether LCD or CRT. Try connecting it to another computer. If this doesn't work, check the monitor's display settings or operating system display settings for contrast or brightness. NEVER open up the monitor, because there is a high voltage capacitor that stores voltage even when the monitor is off and could kill you if it discharges.

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