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Sony Vaio notebook model PCG_4K1L - Power & HD Lite on but no display

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Could be several things, you don't mention this as occuring recently, as in "just happened" or whether things started with an intermittent boot and it got worse over time.

The 1st thing to do, is to eliminate the obvious, try connecting the laptop to an external monitor, if it boots to a good picture, the fault lies below:

  1. Graphics VGA cable has become detached from screen or motherboard (strip screen and check if the 30 pin connectuion is tight and if possible, the connection at the motherboard)
  2. Inverter failed, with screen removed, but still wired to laptop, in a dark room, see if you can detect a faint image on the screen. Try making sure the inverter plug (typically a whte and pink wire connection) is tight in the laptop inverter and the connection from the motherboard is also tight.
  3. Screen failed. If there is no light on the screen, it is likely the screen has failed
You can try swapping the screen and see if you get any joy, also the inverter, although this may be harder to come by. If you know the replacement inverter and screen are good, the issue here would lie with the VGA cable (unlikley to be the culprit). Can be changed but you MUST get one with the correct revision number on.

If however, you get no screen on an external monitor and the laptop appears to be powering up and you have pressed the FN and number buttons to swap from laptop to external, then the problem is likely to be with your motherboard graphics. At this point I'd be inclined to have a professional repairer look at it

Posted on Mar 30, 2011

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1. first try it under a bright light and see if you see a dim image, if so it's your inverter or lcd backlight,
2. try pulling the charger out of the laptop, removing the battery, holding the power button down for 30 seconds to 1 minute in order to drain it, then replace just the charger (not the battery) and try switching it on. this usually fixes basic issues.
3. if no luck, the next thing i would try is the memory (ram) chips under the laptop, remove the small squarish flap with a philips head screwdriver (usually will find two chips - sometimes 1) and remove one of the ram chips, try to start it, no luck, remove the other chip, put the first chip in it's place (remember to put it in at a 35-45 degree angle, make sure it's in properly - AND THEN push it down- or you'll ruin the connectors), mix and match the chips, and if you have other matching ones available, try those.
4. remove any pcmcia cards, usb sticks, internal wireless lan card, dvd drive, hard drive, then switch it on, see if it works, if so, put each item back in one at a time, shutting down and restarting with every successful result, until you get to the one causing the error. 5. it could be a video card issue where the solder joints have left the motherboard or just plain burned up, this is often beyond economical repair - some guys still fix it though.
let me know your results - and be sure to rate if you found my advice sincere, peace, abz

Posted on Mar 30, 2011


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