Hello my friends.
Lenovo G50-30 no post at power up , only 0.110 amp taken .
Impedance are OK .
PR 301 = 0.499v
Pl 301 = Batt coil = 0.544v
VRM section
Pl 901 = 0.013v
Pl 902 = 0.011v
StepDown section
PL 401 = 0.364v
Pl 402 = 0.378v
Ram
Pl 501 = 0.429v
Pl 701 = 0.336v
Pl 602 = 0.164v
Pl 601 = 0.352v
Voltages are OK .
Pl 301 = 1.879v
Pl 901 = 0.809v
Pl 902 = 0.762v
Pl 401 = 3.39v
Pl 402 = 5.13v
Pl 501 = 1.366v
Pl 701 = 1.020v
Pl 602 = 1.049v
Pl 601 = 1.796v
Q4601 = 5Vs present
Q4602 = 3Vs present
Q 26 =+3Valw soc present
Q 28 = 1.35vs present
Q 30 = 1.8vs present
Bios pin 8 = 1.8v
PLTRST= 3v
Sys on/ SUSP / VRON / SYSPWOL = 3v
DDR section
Vtt =0.670v
Vdd = 1.35v
SDA/Scl = 3.3v
Drmarst = 0v must be 1.35v !
Try another bios still the same ,so i try to measure powergood signal of each and every pwm as suggested here :
https://www.badcaps.net/forum/showthread.php?t=88408
Pu 501 = pin 20 = 3.35v
Pu 602 = pin 7 = 3.36v
Pu 701 = pin 7 = 3.36v
and i find my pb here :
Pu 401 = pin 2 = not stable
Pu 402 = pin 2 = not stable (7v ....10v.. 1.2v..0.300v..0.500v..)
As mcplslg say = PIN2 POWERGOOD should be 3V ...but i didn't find this voltage .
Pr 406/407/408 are not populated
What shoul i measure /change !!
Lenovo G50-30 no post at power up , only 0.110 amp taken .
Impedance are OK .
PR 301 = 0.499v
Pl 301 = Batt coil = 0.544v
VRM section
Pl 901 = 0.013v
Pl 902 = 0.011v
StepDown section
PL 401 = 0.364v
Pl 402 = 0.378v
Ram
Pl 501 = 0.429v
Pl 701 = 0.336v
Pl 602 = 0.164v
Pl 601 = 0.352v
Voltages are OK .
Pl 301 = 1.879v
Pl 901 = 0.809v
Pl 902 = 0.762v
Pl 401 = 3.39v
Pl 402 = 5.13v
Pl 501 = 1.366v
Pl 701 = 1.020v
Pl 602 = 1.049v
Pl 601 = 1.796v
Q4601 = 5Vs present
Q4602 = 3Vs present
Q 26 =+3Valw soc present
Q 28 = 1.35vs present
Q 30 = 1.8vs present
Bios pin 8 = 1.8v
PLTRST= 3v
Sys on/ SUSP / VRON / SYSPWOL = 3v
DDR section
Vtt =0.670v
Vdd = 1.35v
SDA/Scl = 3.3v
Drmarst = 0v must be 1.35v !
Try another bios still the same ,so i try to measure powergood signal of each and every pwm as suggested here :
https://www.badcaps.net/forum/showthread.php?t=88408
Pu 501 = pin 20 = 3.35v
Pu 602 = pin 7 = 3.36v
Pu 701 = pin 7 = 3.36v
and i find my pb here :
Pu 401 = pin 2 = not stable
Pu 402 = pin 2 = not stable (7v ....10v.. 1.2v..0.300v..0.500v..)
As mcplslg say = PIN2 POWERGOOD should be 3V ...but i didn't find this voltage .
Pr 406/407/408 are not populated
What shoul i measure /change !!
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