lenovo g550 with no screen display

[georgealbertwadie]

Hi, I have a lenovo g550 model 20023 when I press the power button ,only the power led and the WiFi led are on . and the fan worked then stopped. Thanks in advance

[georgealbertwadie]

Re: lenovo g550 with no screen display

hi i attached images for the front and back of the motherboad,thank in advance

[georgealbertwadie]

Re: lenovo g550 with no screen display

made some tests and i found the following

1-i found some shorts on the processor pins when i take random points
2-Q802,PQ803,PQ805,PQ806: no voltages
3-PQ801,PQ804
when removing processor :
pin 1->4 : 1.48 v
pin 5->8 : 18.7 v
when attaching processor
pin 1->4 : 0 v
pin 5->8 : 18.7 v

4-PU801
pin 26 : 5.18 v
pin 36 : 5.18v
pin 37 : 1.72v
pin 39 : 1.25v
pin 31 : .16v
pin 2 : 1.72v
5-capacitors in the processor base :1.48v - when removing processor
please i need your illumination , thanks in advance

[georgealbertwadie]

Re: lenovo g550 with no screen display

and here is the schematic

[georgealbertwadie]

Re: lenovo g550 with no screen display

Any illumination for this problem , or guide !!!!!!!!

[mustafa007]

Re: lenovo g550 with no screen display

Hi my friend I have the same problem and I did not find the solution .... If you found the solution please help me