Re: MBP A1989 No Power 5.1V .025-.03MA
I double checked CHGR_AUX_DET and the value is still 1.07V, but R7015 is reading really low at 220kOhm and R7016 is reading at around 200kOhm
I do have a raspberry pi that I use as a flash chip programmer...
SugamaGoc
Member
Last Activity: 02-17-2025, 05:28 PM
Joined: 06-14-2021
Location: California
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Re: MBP A1989 No Power 5.1V .025-.03MA
Update: There appears to be a NC_CHGR_SMC_RST_L, but there is no point on the board for me to test it. When I use the boardview the only contact is directly on the ISL9240 somehow
I assume SMC_RESET_L is what this line was denoted as on older boards
:/...Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
RB280, RB284, R3095, and R3090 are all 15 ohms
Theres no TBA_AUX_DET, but there is CHGR_AUX_DET, which is at a stable 1.078V
CHGR_VDDP is 5V
CHGR_VDDA is also 5V
Also SMC_RESET_L and BUF_SMC_RESET_L do not exist on the boardview...Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
For UB090
TBT_X_SPI_CLK = 2mV
TBT_T_SPI_CS_L = 3.3V
TBT_T_ROM_WP_L = 3.3V
TBT_T_SPI_MOSI = ~10mv, but I think thats fine, right?
TBT_T_SPI_MISO = 3.3V
PP3V3_UPC_TA_LDO = 3.3V
TBT_T_ROM_HOLD_L = 3.3V
For U2890
PP3V3_UPC_XB_LDO = 3.3V
TBT_X_ROM_HOLD_L = 3.3V
TBT_X_SPI_CLK = .6mV
TBT_X_SPI_MOSI = 10mv - PS I dont have an oscilloscope and measured this value with a multimeter, so I don't know how or if this signal is changing over time...Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
Yes, they are all 0V.
Diode mode readings & resistances to ground
PP1V1_UPC_TB_LDO_BMC - .527V - 190Kohms to ground
PP1V1_UPC_TA_LDO_BMC - .54V - 190Kohms
PP1V1_UPC_XA_LDO_BMC - .5V - 190Kohms
PP1V1_UPC_XB_LDO_BMC - .527V - 190Kohms
i measured resistance to ground with black probe on ground, but for the diode mode readings i put the red probe on ground...Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
Okay, so I tested the rails as per the wiki:
PP20V_USBC_XB_VBUS - 5.142V
PP3V3_UPC_XB_LDO - 3.291V
PP1V8_UPC_XB_LDOA - 1.819V
PP1V8_UPC_XB_LDOD - 1.802V
PP1V1_UPC_XB_LDO_BMC - 0V
Voltage and current draw is also identical across all CD3215s
Initially I never thought to test them because since PP3V3_G3H_RTC isn't present in the first place
Q7030 - Right Mosfett - Resistance between:
Source (GND) to Drain(CHGR_LX1) - 70kOhms
...Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
For Q7040:
I checked the resistance to ground of PPVBAT_G3H_CHGR_REG, which is just ppbus_g3h, and there was no short.
There was also no short between CHGR_GATE_Q4 and any of the other terminals of the mosfet, or one between CHGR_GATE_Q3 and any other terminal
I did the same tests on Q7030, and found the exact same thing.
Is that what you wanted me to test? If so then yeah, unfortunately I was unable to find anything :/...Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
I replaced the out-of-spec resistor with one that matches the value on the schematic when measured on the board. However, the PPBUS_G3H voltage is the same as it had been before without the fuse.
So now I'm not sure what to do next....Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
1) The voltage for pins 2 & 3 on the battery connector is 0V, but it periodically jumps up to .120V
2) PP3V3_G3H_RTC is 0V, PP1V8_SLPS2R is 0.001V
3) Resistance to ground of those same pins is 3.9M ohms.
4a) PPDCIN_G3H voltage is 5.1V
b)
R7062 is ~53ohms, this does not match the schematic. How did this happen?
R7061 - 1.1ohm
R7021 - .8ohm
R7022 - .8ohm
ThanksLast edited by SMDFlea; 07-16-2022, 03:58 PM.Leave a comment:
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Re: MBP A1989 No Power 5.1V .025-.03MA
PPBUS_G3H is reading ~1M ohms to ground
PPBUS_G3H is higher after removing the fuse, The voltage starts at 2 and then decreases. Once the voltage goes below ~1V, the voltage jumps back up to 2V and the cycle repeats.
Similar to what it was doing before, but now instead of jumping up to 1.1, it goes to ~2V.
Thank you very much for the reply
What do I test next?Leave a comment:
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MBP A1989 No Power 5.1V .025-.03MA
Hello, I purchased an A1989 as for parts & not working a while ago and after a few weeks of troubleshooting would greatly appreciate any help that anyone here could give me.
I'll try to list as much info about the board as I can:
The machine without the battery connected draws 5V and .025mA.
PPBUS_G3H is stuck at ~1V. Sometimes it dips below this momentarily
I2C_PWR_SCL - 0V
I2C_PWR_SDA - 0V
3V3_G3H_RTC is missing as well, because U6960 isn't being powered &
CHGR_EN_MVR is not present as well -
Re: Anyone Have 820-00850 schematic?
tHANKS!Leave a comment:
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