Clevo W670SJ /W650SJ - PowerOn light is on but nothing works
Hello all and greetings from germany 
,
I have a strange notebook here, a clevo W670SJQ1, motherboard is a W650SJ. Problem is: When press the PowerButton, the PowerOn light goes green (on) but nothing happens - no Fan spinning, no HardDisk Spinning. Notebook stay in this status until i press the PowerButton again for ~4 sec to power down.
Battery Charging works fine (LED goes orange, when its full it goes to green).
I have many experience in notebook and graphic-card repairs (many years)
but the thing here is a mystery to me
. I have many equipment like hotair station, thermal camera, experience in bga reballing (with leaded solder balls and stencils)
So, i checked on the dismounted motherboard:
- all coils for short - nothing, all coils not shortet to ground
- 19V is present on all PowerRail Mosfets
- @19V when the notebook is complet off it draw round 2mA. when powerbutton is presed and notebook is in On state it draw only 36mA@19V...
- in this PowerOn State - nothing gets unusually warm, only Super IO Chip and PCH will heat up about 3-6 ° C warmer than the environment (thermalcamera view)
- no 5V, CPU or GPU powerrails goes on
Weired things:
- in off state - on the PowerButton there is 18.5V (i know only 3.3V on other notebooks). This voltage will short to ground when press the powerbutton and the powerOn LED will light on (green). when the system is on, there is only 17V on the powerbutton
- when powered on - the only "rail" that will switch on is the PCH, it becomes round 1.3V, but i think its not the VCC for the PCH (then the PCH must getting hotter i think)
- bevor this here happens - the system was often reset in the bootup-process (windows-start) like short power-off automaticly power on and start windows...or it will stuck in this "boot-loop" until i manual power off the system and power on again, then it have run fine...but no - nothing mor happens
so, what can be the problem here? any tips for me?
,I have a strange notebook here, a clevo W670SJQ1, motherboard is a W650SJ. Problem is: When press the PowerButton, the PowerOn light goes green (on) but nothing happens - no Fan spinning, no HardDisk Spinning. Notebook stay in this status until i press the PowerButton again for ~4 sec to power down.
Battery Charging works fine (LED goes orange, when its full it goes to green).
I have many experience in notebook and graphic-card repairs (many years)
but the thing here is a mystery to me
. I have many equipment like hotair station, thermal camera, experience in bga reballing (with leaded solder balls and stencils)So, i checked on the dismounted motherboard:
- all coils for short - nothing, all coils not shortet to ground
- 19V is present on all PowerRail Mosfets
- @19V when the notebook is complet off it draw round 2mA. when powerbutton is presed and notebook is in On state it draw only 36mA@19V...
- in this PowerOn State - nothing gets unusually warm, only Super IO Chip and PCH will heat up about 3-6 ° C warmer than the environment (thermalcamera view)
- no 5V, CPU or GPU powerrails goes on
Weired things:
- in off state - on the PowerButton there is 18.5V (i know only 3.3V on other notebooks). This voltage will short to ground when press the powerbutton and the powerOn LED will light on (green). when the system is on, there is only 17V on the powerbutton
- when powered on - the only "rail" that will switch on is the PCH, it becomes round 1.3V, but i think its not the VCC for the PCH (then the PCH must getting hotter i think)
- bevor this here happens - the system was often reset in the bootup-process (windows-start) like short power-off automaticly power on and start windows...or it will stuck in this "boot-loop" until i manual power off the system and power on again, then it have run fine...but no - nothing mor happens
so, what can be the problem here? any tips for me?
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