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Recent content by osmun38
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820-00045 12" Retina PPBUS_G3H is 20v
Waiting on board from China. I took q7110 off of the board and it didn't get rid of the short on PPBUS_G3H still have around 140 Ohms- osmun38
- Post #16
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
Sorry that was to ground I think this is right Q7110: S1/D2 --> D1 = 0 Q7110: S1/D2 --> S2 = 472 Q7120: 1 --> 4: 636 Q7120: 1 --> 6: 634- osmun38
- Post #14
- Forum: Macbook Logic Board Repair Questions
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820-00840 won't turn on
Both caps seem fine- osmun38
- Post #23
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
Q7120 Diode = 205 Q7710 Diode = 445- osmun38
- Post #12
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
Red on ground = 203 black on ground = 212 Yes PPBUS_G3H = 4.6V How do you check if Q7110/20 are good ?- osmun38
- Post #10
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
Could that be a short from the chip- osmun38
- Post #8
- Forum: Macbook Logic Board Repair Questions
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820-00840 won't turn on
What are the filter caps... sorry kinda new to this- osmun38
- Post #21
- Forum: Macbook Logic Board Repair Questions
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820-00840 won't turn on
The resistance between PP3V3_UPC_XA_LDO and PP3V3_UPC_XB_LDO = 17.6 OHMs- osmun38
- Post #19
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
PPBUS_G3H = 4.6v it only has 147 OHMS of resistance- osmun38
- Post #7
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
Now its not even getting 20v- osmun38
- Post #5
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
Resistance between R7120 and R7150 is 113 KOhms- osmun38
- Post #4
- Forum: Macbook Logic Board Repair Questions
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820-00045 12" Retina PPBUS_G3H is 20v
PPBUS_G3H is 20v, and I've narrowed it down to the u7100 chip because that is where it gets created, but the schematic is very confusing. It's getting power because it's letting power through, but I can't tell if its a buck converter afterward or the chip itself. The schematic is very confusing...- osmun38
- Thread
- Replies: 16
- Forum: Macbook Logic Board Repair Questions
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820-00840 won't turn on
all three are showing around 8.6 OHMS C3208, U2890 and PP3V3_UPC_XA_LDO Resistance to ground- osmun38
- Post #17
- Forum: Macbook Logic Board Repair Questions
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820-00840 won't turn on
C3208 -- 8.6 OHMS C2890 to ground resistance 8.7 OHMS PP3V3_UPC_XA_LDO -- 8.5OHMS to ground- osmun38
- Post #16
- Forum: Macbook Logic Board Repair Questions
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820-00840 won't turn on
U3200 is still receiving 4.97 V- osmun38
- Post #14
- Forum: Macbook Logic Board Repair Questions