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Repair motherboard I purchased a dead Sony Vaio FX705 for spares but would like a go at trying to restore it. No lights at all when powered up. There must be some protection for the motherboard in a form of a fuse etc, but cannot fine one. What elese can I try to try and restore power to the motherbaord. Thanks Andrew I have a similar Problem With A Vaio FX-705. machine powers on CPU Fan spins up. numlock-caps-scroll flash then bios beeps 3 times. 1 long and 2 short. not sure wether its ram-slots. Corrupt Bios. Missing Operating system. Or Some form of Video Error. Any advice or a point in the right direction Would be appreciated.

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  • Mike Waldron Feb 17, 2008

    Thanks for the reply post.
    I think were getting a little confused between A Sony Vaio FX705 Which is a Laptop Computer. And A Desktop Computer. Regarding The Clear CMOS Settings On A Desktop Motherboard.
    The case may well be software related, as when i purchased the laptop. there was no hard-drive installed. which means no operating system. if i recall from a working vaio i had. the bios contains a sony vaio logo at bootup. so the problem may be as simple as re-installing or trying to recover the original software. i will persist with this. stage 1 test. is that it does,nt seem screen related. just replaced invertor. no difference. Also vaios have a tendency to have ram slot problems. finally i suspect maybe a corrupt bios. i,ll keep posting until this solution is fixed.
    Thanks Mike.

  • Mike Waldron Feb 21, 2008

    Further to this posting. ** which i started in the wrong category** Sorry for that.

    after removing the screen, i noticed that the black ground cable, joining the monitor casing to motherboard. had broken in half. but still makes no difference. the Vaio fx705 will not boot even onto an external Monitor. the solutions narrow down.

    from reading various posts and forums. i,m now beleiving and fearing the worst.

    Vaios have a tendancy to eat RAM. the 3 beeps. 1 long followed by 2 short, on a sony vaio fx705 is most likely The ram-Slots, which lift from the Motherboard. to investigate further still, would be to have the bios re-flashed, and re-install the original software for this model. i,m reluctant to send it in to have the ram slots replaced, as i only paid £100 Or $200 for it. this could cost in excess of £200-£300, due to the scale of the work involved. The moral of the story here is. Don,t buy a faulty Vaio FX705 Unless it boots to a setup-bios screen At Least. Unless you,ve got money to spend on it.

    Andrew if you get any further, please post here. curiositys getting the better of me.

    so if you try bios-re-installation os et,c. keep posting.

    regards Mike.

  • Mike Waldron Feb 24, 2008

    This was posted in the wrong Category.
    This Is A Sony Vaio FX705 Laptop Computer.
    NOT Desktop/AT/ATX Case Motherboard.
    Mike @ Compurepair.


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Take a look on the jumper switch, this switch is for a clear CMOS setting, it is a 3 pin the default settinmgs for this must be in 1 & 2.

Posted on Feb 16, 2008

  • micromaster
    micromaster Feb 16, 2008

    You can overcome many PC problems if you can at least start the PC, whether the problem is due to a bad driver, incorrect monitor settings, flaky hardware, or a troublesome program. In these cases, you may be able to fix the problem by starting Windows in Safe Mode, or by using an emergency boot diskette (see "It's Just Not Normal" or "What To Do When . . . You Need To Create A Boot Disk" in the "See Also:" section below). If that still doesn't solve your problem, keep reading.

    Most boot problems are hardware-related. There are many agents that may have contributed to your PC’s apparent demise. There may be external factors that are causing your PC to misbehave that you can rectify quickly. First, check the power supply and all connections. If everything looks to be connected correctly, the next step is to listen to see if your hard drive is spinning but nothing's on. If this is the case, check to make sure your monitor is turned on and/or unplugged. If you still haven't made any progress with your PC, you may have a Hardware hang-up that's a little more serious (such as your CPU, Motherboard, or a number of other items).

  • micromaster
    micromaster Feb 16, 2008

    PCs need electricity to operate, obviously, so if your system shows no signs of life whatsoever, your PC's power is being interrupted somewhere between your wall socket and your system's motherboard. Let's make sure your PC is actually getting the juice it needs before we assume your system is suffering from a more severe problem.

    First, make sure your system is, in fact, securely plugged into the wall outlet, surge protector, or power strip. Naturally, you would expect your system to be plugged in, but you should check it anyway. It's possible that you, your kids, your dog, or your pet ferret may have accidentally knocked or jostled the PC or the power cord, unintentionally unplugging the system. Or perhaps the surge protector or power strip's switch was accidentally pushed to the off position. If one of these scenarios is indeed the case, breathe a big sigh of relief. Your PC should work fine once you securely plug in the system or turn on the power strip or surge protector.

    Remember that the wall socket is not the only thing your PC is plugged in to. Your power supply's cable plugs into both the wall socket and the power supply, so it's entirely possible that the power supply cable is not securely connected to the power supply. Take a look at the back of your PC. The power supply cable connection should be near the top of the system. Make sure the power supply cable is firmly plugged into the power supply and try to boot your PC again.

    Did you know that many PC power supplies have an on/off switch? If the power supply is set to the off position, you won't be able to boot your PC simply by pressing the Power button on the front of the system. The power supply switch must be set to the On position in order for you to power up your system.

    Take a look at the back of your system, near the top where the power supply is located. If your power supply has a switch, one side of the switch will be marked with a circle, and the other with a dash. The dash position is the on position, so make sure that side of the switch is pressed in. If the circle side of the switch is pressed in, the power supply is turned off and you won't be able to turn on your PC.

    While you're examining the power switch on the back of your power supply, you should also examine the power supply's voltage setting. Almost all power supplies have two voltage settings: 230 volts or 115 volts. (Look for a small red or black switch that is slightly recessed in the back of the power supply.) Note that a handful of power supplies may use settings of 220 volts and 110 volts. U. S. residents should have the voltage set to 115 volts (or 110 if your power supply uses that setting). If your power supply voltage setting is set to 230 volts, flip the switch to 115 volts and turn on your PC.

    Here's another power-supply scenario that may cause your PC not to boot properly. It's possible, albeit somewhat unlikely, that the power supply is not properly connected to your motherboard. You'll have to open your PC's case to check this potential problem, but be sure to unplug your PC first (just don't forget to plug it back in before you restart the system). Remove the case's left side panel and find the main connection for your system's power supply. It should end in a white connector that has two rows of 10 pins. The location of the motherboard's power supply connection varies depending upon the manufacturer of the motherboard, but the connection is usually located near the CPU and memory slots. The motherboard's power supply connection is white and has two rows of 10-pin sockets that correspond to the power supply connection's pins. The power supply connector should be plugged into the motherboard's connection. There should be a small plastic catch on the power supply connector that catches on the lip of the motherboard connector.

    Note that many power supplies have a second, smaller connection. This power supply connection ends in a white plastic block of four pins and connects to another connection on the motherboard. This connection is usually located between (or at least near) the CPU and the motherboard's rear ports. Make sure this power connection is also plugged in.


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