LENOVO G50 -70 power on No screen
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Re: LENOVO G50 -70 power on No screen
Nice Q24 is OK ,you have 17.6v on gate because it's N-channel , the gate must be equal or higher than the voltage on Drain .
I really don't understand what you make! do you have 3V on pin 23 and no voltage on pin 20!Comment
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Re: LENOVO G50 -70 power on No screen
Something is wrong/not clear !
first what do you mean by : I put a ligth in screen and i see activite .!
second at jedp connecter we have :
pin 1/2 = 20v
pin 21/22 = 3.3v
pin 20 = 0v
pin 23 = 3v
can you complete the measurements for : pin 14/16 /19 /30
UE1:
Pin 81 = ENBKL
Pin 22 =PLT_RST
JDDR1 :
Pin 30 =CPU_DRAMRST
JPWRB1:
Pin4 = LID_SW
PL9=CPU_COREComment
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Re: LENOVO G50 -70 power on No screen
Something is wrong/not clear !
first what do you mean by : I put a ligth in screen and i see activite .!
second at jedp connecter we have :
pin 1/2 = 20v
pin 21/22 = 3.3v
pin 20 = 0v
pin 23 = 3v
can you complete the measurements for : pin 14/16 /19 /30
UE1:
Pin 81 = ENBKL
Pin 22 =PLT_RST
JDDR1 :
Pin 30 =CPU_DRAMRST
JPWRB1:
Pin4 = LID_SW
PL9=CPU_CORE
pin 30 = 3.4 v
pin 14 = 0
pin 16 = 0
pin 19 = 0Comment
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Re: LENOVO G50 -70 power on No screen
Ghost , take again the measures , in voltage please !
Pin 81 = ENBKL = 50Ω
Pin4 = LID_SW : 6.6 V..are you sure !!
DRAMRST must be 1.35v ,without it no display.
Since you are getting PLt_RSt means almost everything is ok in power sequence.
there's a a resistance and capacitor between CPU and Pin 30 (JDDR) , what's the voltage for both side of RC22, and is CC1 short to ground.
Make sure your problem NOT on LVDS cable or LED panel. Make sure you're using known good DDR3L
At last flash a known good bios ,it is very likely to solve your problem.Comment
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Re: LENOVO G50 -70 power on No screen
Ghost , take again the measures , in voltage please !
Pin 81 = ENBKL = 50Ω
Pin4 = LID_SW : 6.6 V..are you sure !!
DRAMRST must be 1.35v ,without it no display.
Since you are getting PLt_RSt means almost everything is ok in power sequence.
there's a a resistance and capacitor between CPU and Pin 30 (JDDR) , what's the voltage for both side of RC22, and is CC1 short to ground.
Make sure your problem NOT on LVDS cable or LED panel. Make sure you're using known good DDR3L
At last flash a known good bios ,it is very likely to solve your problem.
Pin 81 = ENBKL = 0V I try to test it again
I found the RC22 and i send you the measures.
i dont have programmer
I have 2 cable for LVDS ,, and two panel i am sure about this ...
The DDR3L test OK ..Comment
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Channel: BIOS Requests ONLY!
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