Thanks for the response jarotech and thanks for the schematic meritorasari and jiroy.update: i checked with continuity form pin 3 of 525au chip,i found the transistor is near cpu area there is continuity on pin 3 on 525au to pin 6.And when i checked the voltage of pin 5 of that transistor 0v and same with pin 6 0v also
With the readings you have taken, we know that the 525AU is good and also the transistor Q33. Only the signal PCH_VDDEN is not good. Have you tried flashing the BIOS?
ok i have noticed on that q33 transistor when i shut down laptop for a long time and turn on, it stays good display for 10 minutes then becomes white.so, i test pin 5 and pin 6 before display ok it shows pin 5 1.8v and pin 6 it shows 1.3v and dropped to 1v if it goes white but pin 5 steady at 1.8v.
sorry when i checked again it not 5-n its S-N mark on the transistor i cannot focus the chip because i dont have microscope but i upload the image the one with the red mark is the transistor connected to 525au chip, and has mark S-N same with the two other transistor.
I did not try to swap instead ill try first reheat the chip for a couple of seconds and try again and now there is 3v on pin 6 of the transistor and on the schematics its showing that pin 6 should have 3v and now the voltage it's not dropping.I test for a couple of minutes to make sure and see if its the same issue,I will update later. thanks again for the response jarotech
Update:thank you jarotech for the help I tested now for nearly a hour the issue not came back the display is ok.I checked Q33 pin 6 the voltage 3v is steady and not dropping,but I am worried on Q31 pin 6 for PCH_BRIGHT the voltage only is 2.1v and on the schematics it should be 3v.Is this ok if pin 6 q31 not become 3v?
Comment