Nice. I have made order for the chip, but it'll take a few weeks, then we see.
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pearman
Member
Last Activity: 04-01-2017, 11:14 AM
Joined: 07-25-2013
Location: Oslo
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
Nice. I have made order for the chip, but it'll take a few weeks, then we see....
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
Thank you for helping me, I hope we can figure this out
For U7200 Pin13/EN0 is master enable and it is 0.3v (VO2/PP3V3_S5_REG will be off).
Master enable signal comes from U7941, Pin03, P5V3V3_REG_EN, which is low.
And since U7941 Pin02 is low, this seems correct behavior. Back to SMC 4900 not giving SMC_PM_G2_EN signal.
I checked that Pin14 SMC_BC_ACOK on U7000 is only 2.38v, and I assume this would need to be at least 3v for correct signal to SMC?
Could this explain...Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
No shorts on U7941, except GND then
What about previous chip U7090, does it not seem suspicious that R7093 is infinite?
Picture of R7093 pads?
...Last edited by pearman; 10-14-2014, 04:41 PM.Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
If you check here;
It seems like the signal P5V3V3_REG_EN is from signal SMC_PM_G2_EN (which is 0). P3V3S5_EN_L_R is inverted SMC_PM_G2_EN, and voltage here is good, so I think U7200 is good, but simply not getting the right signals from U7941?
U7200 enable (P5V3V3_REG_EN) comes directly from SMC_PM_G2_EN
Bil-flex/board is disconnected. Only charger/fan connected....Last edited by pearman; 10-14-2014, 01:01 AM.Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
Ok so I checked
[CODE]U5010 / SN0903048
Pin01 3.49v PPV3V42_G3H
Pin02 GND
Pin03 3.49v PP3V42_G3H
Pin04 1.0v SMC_MANUAL_RST_L
Pin05 3.18v SMC_RESET_L
Pin06 3.33v SMC_TPAD_RST_L
Pin07 3.46v SMC_ONOFF_L
Pin08 3.30v PP3V3_S5_AVREF_SMC[/CODE]
And it seems to generate SMC_RESET_L correctly, to SMC U4900?
But from U4900 there is no SMC_PM_G2_EN, which is why it doesnt power on?
Measured from U4900 and it's giving power on:
...Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
[CODE]U7941 / SLG4AP012
Pin01 3.49v (probe 155) PP3V42_G3H
Pin02 0.0v (probe 1233) SMC_PM_G2_EN
Pin03 0.0v (probe 872) P5V3V3_REG_EN
Pin04 3.32v (probe 324) P3V3S5_EN_L_R
Pin05 GND
Pin06 0.01v (probe 1480) PP3V3_S5
Pin07 0.0v (probe 1189) S5PGOOD_DLY
Pin08 0.0v (probe 327) S5_PWRGD[/CODE]...Code:Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life [CODE]U7941 / SLG4AP012 Pin01 3.49v (probe 155) PP3V42_G3H Pin02
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
U7200:
[URL=http://imgur.com/F7CYZy3][/URL]
Nothing shorted to GND at least, except Pin15.
Interesting post there. I checked the area around U5010 and there is some residue visible with microscope.
I wasnt made aware the board had liquid damage but this sure looks like it, so I'm going to give it a good cleaning.
U5010-area:
[URL=http://imgur.com/Ky5Zgeu][/URL]
(I missed this checking with magnifier..)Re: Macbook Pro 13" A1278 (Mid 2012) no...Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
[CODE]Q7221 / SSM6N37FEAPE
Pin01 GND
Pin02 3.27v (probe 1520) P5VS3_EN_L
Pin03 0.0v (probe 889) P3VS5_ENTRIP
Pin04 GND
Pin05 3.32v (probe 904) P3V3S5_EN_L
Pin06 0.0v (probe 890) P5VS3_ENTRIP[/CODE]
[CODE]Q7220 / RJK0216DPA
Pin01 0.0v
Pin02 GND
Pin03 GND
Pin04 GND
Pin05 0.01
Pin06 12.28
Pin07 12.28
Pin08 12.28
Leftside,
L1 0.01
L2 0.01
L3 12.28v
...Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
Yep, magsafe light is off. Should U7200 be off? (no enable on pin13)
It seems that way if I read page 73 correctly..
[CODE]U7200 / TPS51125
Pin01 = 0.0v (probe 890) P5VS3_ENTRIP
Pin02 = 0.0v (measured on R7267) P5VS3_VFB
Pin03 = 0.0v (probe 874) P5VP3V3_VREF
Pin04 = 0.0v (probe 881) P5VP3V3_REG3
Pin05 = 0.01v (measured on R7269) P3V3S5_VFB
Pin06 = 0.0v (probe 889) P3V3S5_ENTRIP
Pin07 = 0.01v (pin7) P3V3S5_VO2
Pin08 = 0.0v (probe 881) P5VP3V3_REG3...Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
[CODE]F7040 = 12.27v both sides (PPBUS_G3H probe 1345, PPVBAT_G3H_CHGR_REG probe 211)[/CODE]
[CODE]U6990 / PM6640
Pin01 = NC
Pin02 = 3.82v (probe 1131) P3V42G3H_FB
Pin03 = 9.37v (probe 328) P3V42G3H_TON
Pin04 = 18.60v (probe 220) PPVIN_G3H_P3V42G3H
Pin05 = GND
Pin06 = 3.47v (probe 219) P3V42G3H_SW
Pin07 = 18.60v (probe 220) PPVIN_G3H_P3V42G3H
Pin08 = 3.82v (probe 1131) P3V42G3H_FB
Pin09 = 3.49v (probe 155) PP3V42_G3H...Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
18.9v (85W charger)
3.46V (probe 882, SMC_ONOFF_L)
Do you mean LT3470 / U7090?
[CODE]U7090 / LT3470A
Pin01 P5V5G3H_FB = 0.00v
Pin02 PP5V5_CHGR_VDDP = 0.00v (probe 1037)
Pin03 P5V5G3H_BOOST = 0.00v
Pin04 P5V5G3H_SW = 0.00v (probe 1090)
Pin06/07/08 PPCHGR_DCIN_D_R = 0.00v (Probe 1019)[/CODE]
[CODE]U7000 / ISL6259HRTZ
Pin01 = 0v (probe 200) CHGR_AGATE
Pin02 = 18.54v (measured on C7005) PPCHGR_DCIN
...Leave a comment:
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Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life
[CODE]U7000 / ISL6259HRTZCHGR_ACIN = 4.46v
Pin05 CHGR_ICOMP = 1.13v (probe 175)
Pin01 CHGR_AGATE = 0v (probe 200)
Pin28 CHGR_CSI_P = 18.43 (probe 201)
Pin19 PP5V1_CHGR_VDD = 5.08v (measured on R7001)
Pin20 PP5V1_CHGR_VDDP = 5.07V (probe 202)
Pin03 CHGR_ACIN = 4.46v (probe 176)
Pin02 PPCHGR_DCIN = 18.54v (measured on C7005)[/CODE]
Anymore pins interesting on the U7000?Code:Re: Macbook Pro 13" A1278 (Mid 2012) no signs of life [CODE]U7000 / ISL6259HRTZCHGR_ACIN
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Macbook Pro 13" A1278 (Mid 2012) no signs of life
Hello everyone,
I am a novice (or the step just before) trying to troubleshoot a logic board that shows no signs of liquid damage or other abuse, but it will not start. The magsafe charger does not light up at all.
I know that the charger is OK, and that the magsafe-board is OK.
I have the board schematics as well as well as a brd layout file.
I have probed for voltage and it seems my problem starts with the U7090 / LT3470A.
Here are some probed voltages from that chip and near by;
[CODE]Pin06 PPCHGR_DCIN_D_R = 0.00v (Probe 1019)... -
iMac 20" 2008 - shuts down
Hello there,
I have an iMac that intermittently shuts itself down. The power supply has been replaced, but the issue is still there. Usually it takes 5 to 30 minutes before it shuts down. After shutdown it instantly restarts again.
I have not been able to stress the shut down - doesnt seem to matter if CPU is fully stressed or idle - it'll shut down anyway.
I have eliminated heat issues, so I was thinking there's a bad capacitor some where on the logic board. I cant see any bulged capacitors, but at least one of the capacitors has a small crack in the paint... -
Re: New Members - please post your introductions here
Greetings internet friends. I am not a spambot, I promise! ;-)Leave a comment:
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