I see 19v in a few areas. None of the coils are shorted to ground. And I haven't detected any shorts in the obvious areas. There is no response when i press the power button. There is 0.00 Amps drawn from bench power supply at 19v power connector.
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Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8
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Re: Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8
Regarding PL20, PL21. When power is initially applied to 19v connector, they both get a quick blip of voltage for a split second, then down to 0v, almost too fast for the multimeter to show. I was able to read 2.1v at the aluminum capacitor c747 as it slowly discharges. Also, pin 8 on bios chip shows this quick blip of voltage as well.
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Re: Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8
I checked (pu1) (bq24738H)
pin10 looks low, but I don't know if it's supposed to be 1v when board is at idle, then 3v when board is powered on?
pin1,2,3,20= 19.5v
pin4= 25v
pin5= 3v
pin6= 2.6v
pin8,9= 3.3v
pin10= 1v
pin11,12,13,18,19= 2.8v
pin14= ground
pin15= 0v
pin16,17= 6vAttached Files
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Re: Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8
Okay, this one is interesting.
(pu10 APW8713QBI-TRG)
Pin1,2,3,4,5 = 0v
Pin6 =11.2v
Pin7 cycles from 0v to 300mv then repeats
Pin8 =19.5v
pin9 =19.5v
Pin10,11 =0v
Pin2,13,14,15 grnd
Pin16,17,18 =0v
Pin19 grnd
pin20 =0v
pin21 =0v
pin22 =19.5v
pin23 =300mv
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Re: Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8
Originally posted by flatline View PostOkay, this one is interesting.
(pu10 APW8713QBI-TRG)
Pin1,2,3,4,5 = 0v
Pin6 =11.2v
Pin7 cycles from 0v to 300mv then repeats
Pin8 =19.5v
pin9 =19.5v
Pin10,11 =0v
Pin2,13,14,15 grnd
Pin16,17,18 =0v
Pin19 grnd
pin20 =0v
pin21 =0v
pin22 =19.5v
pin23 =300mv
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Re: Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8
Hi techtiger, PL16 is 150ohm with or without RAM.
PL21 3k ohm
PL20 70k ohm (takes a few seconds to settle fom 130K-70Kohm)
PU11 Pin1 7 8
0V 4.5V 19.5V
PU12 Pin1 7 8
0V 5V 19.5V
PL20,21 are 13ohm when I accidentally checked for ohms while power supply is still on board and supplying power. And of course, there is no voltage at PL20,21. But I guess that means there is a gate to ground?
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Re: Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8
Pressing power button brings NBSWON1# from 3V to low state?
After that IT8987 should bring DNBSWON# high and give a short low pulse to cpu.
Cpu should respond with susb# and susc# going high.
IT8987 might need to be reprogrammed.
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