1 Laptop will not boot
My laptop has had blue screening and other issues for the past couple of months, and then my graphics card started to fail.
I mostly got these issues resolved, until suddenly recently, the laptop crashed and will not turn on and boot up again. The battery light still turns on, and when I press the power button, the power button and keyboard briefly light up, then turn off, and nothing happens. I cannot even access BIOS or anything, the backlight in the display does not turn on, no fans, nothing except the brief light up.
I removed and replaced the CMOS battery, and I also took out the RAM sticks one by one to see if that was the issue, but no luck.
There is no blatant physical damage to anything, and I have not dropped/physically damaged my laptop in anyway I can think of. My laptop sits in my basement on a cooling surface 99% of the time.
Any fix/verdict?
Ist dies eine gute Frage?
Try taking out/disconnecting main battery and just plug in charger.
von mike
have tried, did not work
von Christian Tims
@Christian Tims
Maybe check if the CPU fan is OK or not.
Not only the fan motor but the two sensors i.e. rpm and temp. The motor is the red and black wires and the sensors are connected between the yellow and black and the blue and black. (or maybe red - not sure whether it checks for a varying earth resistance value or voltage value - usually rpm is voltage pulses - hall effect sensor so spin the blades perhaps and temp is resistance)
Not sure but if the BIOS doesn't detect the fan it won't start as there's no point. the CPU has to be protected so you don't want it to begin to overheat only to have to shut it down again.
von jayeff
ok, what are signs they are ok and are not ok?
von Christian Tims
@Christian Tims
You need to use and Ohmmeter and check that the fan motor, the temp sensor and the rpm sensor all test OK
The fan motor is between the red and black.
I don't know what colour wire is used for what sensor so you will have to try different things e.g. blue wire and black wire either a resistance or spin the blades of the fan and check for pulses. yellow and black the same.
If no good try blue and red and yellow and red.
The bottom line is that there should be something seen by the meter. and that there isn't an open circuit reading for any of the sensors or the motor.
Do all measurement with the fan disconnected from the motherboard. Only test the fan at the fan cable plug
von jayeff
2 weitere Kommentare anzeigen