Question about IBM ThinkPad T20 2647 Notebook

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IBM T20 2647-84U Goes blank screen(even on external monitor)after a few minutes.

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HI.

Posted on Dec 17, 2009

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Doesn't sound like they can get to the control panel? Your MB sounds like it has a bios lock and needs to be sent to someone who can clear that security situation off the MB, or sell it for parts.

Posted on Nov 18, 2008

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Lakay_018

i have the same problem, my laptop goes on blank and a padlock apperar on the left side of of the screen.can you help me please.need for your responce as soon as possible...


thank you and god bless

Posted on Nov 12, 2008

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Check power settings in control panel

Posted on Aug 24, 2008

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2 Answers

Blank screen upon startup


Try taking out the hard disk, plug in power and see if you have a display on your screen or external monitor. if same thing happen, try taking out the memory card. If you hear a beep sound it's a faulty mem. card, if no beep sound appears I suspected it's a motherboard faulty.

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If the issue occurs in the safe mode, then I'm suspecting a failure of the LCD backlight. (It warms up and quits) Also see if video stays on using an external monitor. If it does, then the LCD is most likely failing.

If video goes out on an external monitor as well, then the Video card is failing due to overheating. Make sure all vents are free of dust (Clean with canned compressed air) and the all fans are functional (Run the fan test in diagnostics) If fans check up, then video card is failure point. If fans fail diags, replace affected fan 1st

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The backlight is the light bult that illuminates the screen. Before it finally goes out completely it will turn your screen a pink color on startup (and then usually become brighter and the pink fades). It is also possible that the backlight, also called a Cold Cathode Flourescent Light, CCFL, died an immediate death. But usually they take a while and signal with the "PINKNESS" first. If you found that your computer is working just fine connected to an external monitor (and you moved the base of your laptop around while connected to the monitor to be sure and left the computer on for a long time) then you have verified that the screen is the problem. It is usually two things: (1) the inverter, a circuit board that increases the voltage to supply the LCD which eats around 700 volts (yeah baby); or (2) the backlight itself. The first problem is a relatively easy and inexpensive fix. You can find how to replace an inverter by downloading the Hardware Maintenance Manual for the T40, T41, etc., from IBM/Lenovo's site. Replacing the backlight itself, a bulb that is like a strand of speghetti and even more delicate, is a tougher job. I would suggest purchasing a replacement screen in that event rather than replacing the backlight yourself. (The HMM probably does not show you how to replace the backlight/CCFL as it is a potentially dangerous job.) That suggestion assumes you can find a cost-effective replacement screen and do not mind opening the TP and putting the new screen in. At least look at the HMM to see what is involved. Good luck.

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Right click anywhere on Desktop> Properties>Settings> Try to lower Screen resolution.

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The panel on my 600x works for a few minutes then turns off.


Your problem definitely sounds like the inverter - when you press FN-F7 you're restarting it and giving it a mild jolt. Luckily, it is a breeze to replace - undo two screws and pop off the screen bezel and it's just behind the contrast control. Get the service manual for the 600X from Lenovo's website which gives full stripdown details.

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unplug everything from your laptop unplug the power from the laptop close it and turn it over remover the battery open and hold the on button(battery is still removed) for a 10 count, replace the battery
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Hi

Its inverter or mother board problem power which passes to backlight is cutting off because of over heart (over heart of some IC).

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Saw exactly the same think on another t41 i was trying to fix. If it was moved at all screen went off.

Turned out it was corrosion on the motherboard that was causing the problem.

Has it been liquid damaged or got damp in the past?

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