820 3115B Green light sometimes, ON/OFF

[JorgePayar]

No Title

I know you are busy...but...any help is welcome

 

[dukefawks]

Uhm PPBUS_G3H should never go over 12.6V! Check sense resistor circuit around U7000. R7021/22/51/52. First get this working then we will look at the video/BKL issue.

 

[JorgePayar]

Ok thanks a lot

 

[larossmann]

What was the original issue on this, and where(if it was a spill)? 16v on PPBUS_G3H is f'd up!

 

[JorgePayar]

r7021: 10,2 Ohms
r7022: 10,2 Ohms
R7051: 2,5 Ohms
R7052: 0,003 Ohms

I think they are good, can a cap be causing that?

 

[larossmann]

D6990 should not be fluctuating. Is PP18V5_DCIN_CONN moving up and down?

Also, when you plug the charger in, do you get 0 fan spin, or one tiny little flicker of a fan spin?

Do the caps by the T29 boost circuit look like shit?

Does U2600 area look like shit?

Does the SMC look like shit?

More hints please

 

[JorgePayar]

No Title

D6990 should not be fluctuating. Is PP18V5_DCIN_CONN moving up and down?

Also, when you plug the charger in, do you get 0 fan spin, or one tiny little flicker of a fan spin?

Do the caps by the T29 boost circuit look like shit?

Does U2600 area look like shit?

Does the SMC look like shit?

More hints please

Ok, next episode on this mofo mobo, yesterday night everything was good, green light...
I was going to measure all the things you told me today and...no green light...now ppbus_g3h 2V hmm, then u7000 was shorting!! I quit the U7000 check pins 27 28 and they are shorted!! (diode mode = beep) still shorted without u7000

Anyway I´ll try to answer you as best as I can

D6990 should not be fluctuating. Is PP18V5_DCIN_CONN moving up and down?

PP18V15_DCIN_CONN was not fluctuating when I measured before.

Also, when you plug the charger in, do you get 0 fan spin, or one tiny little flicker of a fan spin?
0 fan spin, nothing at all

Do the caps by the T29 boost circuit look like shit?
A little bit shity, Im working on it

Does U2600 area look like shit?
Kind of... Im working on it

A little bit yes, Im gonna change caps and resistors

Does the SMC look like shit?
No, it is ok

More hints please
Sorry about the pics I don't have a camera for the trinocular port yet

 

[JorgePayar]

I think those pins must be like they are now, anyway I have measured u7000 pins without the chip

Values are:

pin 1:OL
pin2:OL
pin3:OL
pin4:0.563 V
pin:5:OL
pin6:0,663 V
pin7:OL
pin8:OL
pin9:OL
pin10:0.614 V
pin11:0,613 V
pin12:0,337 V
pin13:0,463 V
pin14:0,488 V
pin15:OL
pin:16:OL
pin17:0,447 V
pin18:0,447 V
pin19:OL
pin20:OL
pin21:OL
pin22: 0V (GROUND)
pin23:0,447 V
pin24:OL
pin25:OL
pin26:OL
pin27:0,903 V
pin28:0,903 V

Ok U7000 was shorted and I don't have another one right now to test it
ppbus_g3h f7040: 2V so probably T29bst is responsible as Louis said in one or their videos?

 

[larossmann]

[TABLE="border: 0, cellspacing: 0"]
[TR]
[TD="align: left"]pin 1[/TD]
[TD="align: right"]0.578[/TD]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: left"]pin 2[/TD]
[TD="align: right"]0.568[/TD]
[TD="align: right"]16[/TD]
[/TR]
[TR]
[TD="align: left"]pin 3[/TD]
[TD="align: right"]0.473[/TD]
[TD="align: right"]3.9[/TD]
[/TR]
[TR]
[TD="align: left"]pin 4[/TD]
[TD="align: right"]0.478[/TD]
[TD="align: right"]3.4[/TD]
[/TR]
[TR]
[TD="align: left"]pin 5[/TD]
[TD="align: right"]0.684[/TD]
[TD="align: right"]1.3[/TD]
[/TR]
[TR]
[TD="align: left"]pin 6[/TD]
[TD="align: right"]0.563[/TD]
[TD="align: right"]3.4[/TD]
[/TR]
[TR]
[TD="align: left"]pin 7[/TD]
[TD="align: right"]0.681[/TD]
[TD="align: right"]0.98[/TD]
[/TR]
[TR]
[TD="align: left"]pin 8[/TD]
[TD="align: right"]0.478[/TD]
[TD="align: right"]2[/TD]
[/TR]
[TR]
[TD="align: left"]pin 9[/TD]
[TD="align: right"]0.66[/TD]
[TD="align: right"]0.032[/TD]
[/TR]
[TR]
[TD="align: left"]pin 10[/TD]
[TD="align: right"]0.443[/TD]
[TD="align: right"]3.4[/TD]
[/TR]
[TR]
[TD="align: left"]pin 11[/TD]
[TD="align: right"]0.444[/TD]
[TD="align: right"]3.4[/TD]
[/TR]
[TR]
[TD="align: left"]pin 12[/TD]
[TD="align: right"]0.308[/TD]
[TD="align: right"]3.4[/TD]
[/TR]
[TR]
[TD="align: left"]pin 13[/TD]
[TD="align: right"]0.406[/TD]
[TD="align: right"]3.4[/TD]
[/TR]
[TR]
[TD="align: left"]pin 14[/TD]
[TD="align: right"]0.45[/TD]
[TD="align: right"]3.3[/TD]
[/TR]
[TR]
[TD="align: left"]pin 15[/TD]
[TD="align: right"]0.682[/TD]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: left"]pin 16[/TD]
[TD="align: right"]0.605[/TD]
[TD="align: right"]5[/TD]
[/TR]
[TR]
[TD="align: left"]pin 17[/TD]
[TD="align: right"]0.405[/TD]
[TD="align: right"]12.5[/TD]
[/TR]
[TR]
[TD="align: left"]pin 18[/TD]
[TD="align: right"]0.406[/TD]
[TD="align: right"]12.5[/TD]
[/TR]
[TR]
[TD="align: left"]pin 19[/TD]
[TD="align: right"]0.419[/TD]
[TD="align: right"]5[/TD]
[/TR]
[TR]
[TD="align: left"]pin 20[/TD]
[TD="align: right"]0.42[/TD]
[TD="align: right"]5[/TD]
[/TR]
[TR]
[TD="align: left"]pin 21[/TD]
[TD="align: right"]0.416[/TD]
[TD="align: right"]0.5[/TD]
[/TR]
[TR]
[TD="align: left"]pin 22[/TD]
[TD="align: right"]0[/TD]
[TD="align: right"]0[/TD]
[/TR]
[TR]
[TD="align: left"]pin 23[/TD]
[TD="align: right"]0.406[/TD]
[TD="align: right"]12.5[/TD]
[/TR]
[TR]
[TD="align: left"]pin 24[/TD]
[TD="align: right"]0.794[/TD]
[TD="align: right"]13.3[/TD]
[/TR]
[TR]
[TD="align: left"]pin 25[/TD]
[TD="align: right"]0.543[/TD]
[TD="align: right"]16.81[/TD]
[/TR]
[TR]
[TD="align: left"]pin 26[/TD]
[TD="align: right"]0.575[/TD]
[TD="align: right"]15.93[/TD]
[/TR]
[TR]
[TD="align: left"]pin 27[/TD]
[TD="align: right"]0.573[/TD]
[TD="align: right"]16[/TD]
[/TR]
[TR]
[TD="align: left"]pin 28[/TD]
[TD="align: right"]0.569[/TD]
[TD="align: right"]16[/TD]
[/TR]
[TR]
[TD="align: left"] [/TD]
[TD="align: left"]diode mode red probe on ground[/TD]
[TD="align: left"]voltage[/TD]
[/TR]
[/TABLE]

 

[larossmann]

Those are my measurements from a good board a long time ago.

 

[JorgePayar]

Ok thanks but if the pin 1 is OL where can I follow the white rabbit? SMC_DCIN_ISENSE??

 

[JorgePayar]

pins 27/28: 20,2 ohms
pins 17/18: 2,8 ohms

 

[larossmann]

My best guess at this point is that U7000 is not soldered flatly on the board or is bad. Your measurements show no short on PPBUS_G3H

 

[JorgePayar]

AC IN U7000 DIODE MODE 0,005 V Could be bad that u7000?
But when I measure ppbus_g3h with no u7000 in f7040 shows 1,8V- 2V

 

[aprendiz]

did you measure AC IN in diode mode with charger pluged??

 

[JorgePayar]

did you measure AC IN in diode mode with charger pluged??

No, without charger why?

 

[larossmann]

CHGR_ACIN should have high resistance to ground and be 3.7-4v with charger plugged in. If it is showing very low reading to ground then U7000 is fucked.