Samsung notebook np-r40 turns on but no screen or service lights
I tried to power up my samsung notebook this morning, it powered up however no screen illuminated nor did any of the 5 service led's situated to the right of the power button this is ballfling me as i can hear the hard drive working away
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Do you see any sign of power like lights (blinking or not) in the computer?
If there no lights in the computer then do the following.
1. Check the power cord for any signs of damages. Does it still lit? 2. Remove the battery and use the power cord only to turn on your computer. If it turns on, then replace the battery. If it doesn't then replace the power cord.
However, you can also try using a different power cord which is compatible with your computer to make sure that your computer still turns on by using a known good power cord. If it doesn't turn on then get it serviced.
remove the battery and adapter. press power button for 30 sec. then connect the adapter. press power button. if this didnt work. you need to ask for an help of a local tech to check for the video card and cable.
There is a simple test to narrow the possibilities. Connect your Thinkpad to a known working monitor using the video out connections at the back base of the computer. Then power on your R40 and see if the distorted screen develops on the known working monitor. If it does then you very likely have the BGA video problem, or Ball Grid Assembly problem and the problem is caused by a video/graphics chip on the motherboard. If you known working screen paired with your R40's base works fine, then you know it is a problem related to the screen itself and will call for either a new inverter or new backlight or new screen depending on further tests. But my bet is that it is the BGA problem which you can learn more about by searching for those terms on the net. There are services that repair ("reball") these BGAs but you have to remove the motherboard from the computer, or pay the service to do so. You can download the HMM, Harware Maintenance Manual, from IBM/Lenovo's site to get an idea of what is involved in opening up your R40 to extract the motherboard. This should help you narrow things down.
This could be a battery problem. Remove the battery and start on the power supply only. If this doesn't work, then check the power supply with an ohm meter to see if it's getting the proper output to the machine. If the supply checks good, then I'm afraid that you have a problem component on the motherboard, and will need to have it professionally diagnosed in order to track down the exact problem component.
This is possibly, a loose cable or the screens inverter board is overheating. the inverter is similar to a booster in a flourescant light fitting. which converts power from DC To AC and boosts up the panels Light Tube. CFL if it,s faulty or overheating. this will cause the panel to dim.
also check the plunger at the underside of the screen, isn,t sticking down. designed to cut off the panel when the lid is closed. Finally some model laptops, only boost the brightness running on A/C Power. the battery would run-out fast with screen at full brightness. if theres an fn key on the keyboard, press fn and the brightness button to adjust screen brightness.
Check the ac adapter. It seems your adapter is not charging it. Either the ac adapter or your dc port may be the problem. Is this the correct adapter, is it giving the correct voltage. These should be considered also.