Re: A1989 (820-00850) - 5V@0.23A - shorted usbc cable
Yes and whenever you are ready let me know and ill be glad to help....
Simplebeans
Senior Member
Last Activity: 12-10-2023, 03:45 PM
Joined: 09-27-2021
Location: Leicester
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Re: 820-01041 stuck on 5volt 220mah
Your not getting PP1V1_UPC_XB_LDO_BMC on all 4 CD3215's? Did you check the grounding capacitors on all 4 lines?...Last edited by Simplebeans; 02-02-2023, 02:12 PM.Leave a comment:
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Re: MacBook A1466 820-165-A No power Missing PM_SLP_S4_L
Did you check the signals around the SPI rom circuit to make sure there all ok? i.e the SPI_MLB_CS_L etc?...Leave a comment:
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Re: A1989 (820-00850) - 5V@0.23A - shorted usbc cable
Hi wnt2fx can you post all the voltage readings for the 4 LDO rails on all four of the CD3215's, So that's the U3100, U3200, UB300 and UB400. If you need any help with what signals you need to measure for this let me know.
And are you using a Genuine Apple 61W USB-C Power Adapter with the USB-C Charge Cable?...Last edited by Simplebeans; 09-22-2022, 12:43 PM.Leave a comment:
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Re: ASUS ViviBook X512F no power
I appreciate your input but really not sure what you mean? The status of the machine has not changed (apart from replacing a mosfet), the voltage measurements are all the same as when i started this thread. The only inductor that has a voltage reading is the one right near the charger IC. All the other inductors are showing 0V....Last edited by Simplebeans; 08-11-2022, 03:55 AM.Leave a comment:
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Re: ASUS ViviBook X512F no power
Ok 2nd mosfet issue now resolved, resistance readings are good now. Still no power....Leave a comment:
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Re: ASUS ViviBook X512F no power
Yes i just measured and the current sense resistor which does have a measurement of 19V on both sides of it, PIN's #1 and #2 respectively.
I have just noticed something interesting that i may not have noticed previously. So the first dc in mosfet (M3056M) when measuring resistance from S-G: i get 97KΩ however the second mosfet (M3054M) S-G measures 2.6KΩ. The interesting thing is all the other mosfets in the circuit after these mosfets, that i have mesured so far are showing all at around a 7.3KΩ measurement...Last edited by Simplebeans; 08-04-2022, 12:58 PM.Leave a comment:
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Re: ASUS ViviBook X512F no power
01) The first mosfet in the dc-in circuit at the drain, source all measure 19V and the gate measures 24V. The power reaches the second mosfet, there at the drain then measures at 19V however no voltages measure on the source/gate side of second mosfet.
02) The main current sense resistor i can see, is placed near the first mosfet in the dc-in circuit, the resistance at this resistor (meter is resistance mode 20MΩ), black probe to ground point and red probe to PIN #1/2 @ the resistor measures 3.2MΩ and rising....Last edited by Simplebeans; 08-01-2022, 02:41 PM.Leave a comment:
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Re: ASUS ViviBook X512F no power
Haha thats why its nice working on Macbooks, there is always a schematic(s)....Last edited by Simplebeans; 08-01-2022, 01:54 PM.Leave a comment:
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Re: ASUS ViviBook X512F no power
Hi thanks and appreciate your help on the 0Ω resistor, at least we know what that part is now.
Do you have any schematics for this board at all?...Last edited by Simplebeans; 08-01-2022, 11:29 AM.Leave a comment:
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Re: ASUS ViviBook X512F no power
On the USB tester i can see when i plug into the power it reads 0.00amps. So drawing no current....Leave a comment:
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Re: macbook pro 13 2016-2017 820-00840 stuck on apple logo
What readings do you get on a USB tester during this issue?
I would be inclined to revisit this, when you changed the bios you need to get the machine atleast getting to the apple logo to see if its produces the same error. This way we can rule out the bios....Last edited by Simplebeans; 07-14-2022, 11:54 AM.Leave a comment:
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Re: ASUS ViviBook X512F no power
Yes no power, also when the charger is plugged in there are no lights illuminated....Last edited by Simplebeans; 07-02-2022, 06:05 AM.Leave a comment:
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Re: ASUS ViviBook X512F no power
Ok so replaced the lcd connector, i didn't want to do any further testing until this was done. I have just checked resistance to ground on both coils, below are the readings(multimeter in resistance mode 20KΩ, black probe to ground point and red probe to each side of each of the coils):
5V Coil: 10.82KΩ
3V Coil: 7.89KΩ
Checking the mosfets on the 5V, 3V rails near the coils, both of the rails seems to be getting the 19V at the drain of 1 of the mosfets, nothing on the gate/source....Last edited by Simplebeans; 07-01-2022, 08:05 AM.Leave a comment:
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Re: ASUS ViviBook X512F no power
Thanks so a couple of things i have done so far just to update, i had to remove the LCD connector because when plugging in the charger this was getting hot and upon closer inspection the PINS on the LCD connector on one side were damaged. Checking under the thermal camera to make sure I could see that this one side of the LCD connector was indeed getting hotter. So I have removed and plan on replacing that from a donor board.
As suggested I measured the resistance on both sides of the missing component and this is the readings...Last edited by Simplebeans; 06-27-2022, 12:40 PM.Leave a comment:
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Re: ASUS ViviBook X512F no power
mcplslg123 that would be the most ideal scenario however the part was so badly damaged i was not even able to conduct any tests on the part. The observation I was able to make was when I have the cheer plugged in the 19V is flowing to the right hand side of the blown part (if you are looking at the picture I have attached) and on the left hand side of the blown part it measures 0V, so this inference also makes me think that it’s either a coil/fuse. But as I can’t measure I cannot tell....Leave a comment:
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Re: ASUS ViviBook X512F no power
Thanks and any idea of the values for the fuse?...Leave a comment:
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ASUS ViviBook X512F no power
Hi,
I got myself hands on a Asus ViviBook X512F which the seller said has been liquid damaged that has no power. The motherboard number is 'X512FF' - Rev 2.2. I am using a genuine ASUS 45W Power Adapter. When plugging in power adapter there is no lights that illuminate and the machine does not power on when pressing the power button.
When I removed the motherboard from the chassis it seemed one of the components was completely burnt out! I have attached a picture below of the component which i have successfully removed, circled in white, this is the component that was...Last edited by Simplebeans; 06-17-2022, 05:06 PM. -
Re: Macbook Air 820-3437B missing PP3V3_S5
No problems sir. Thats the thing i like about the Macbook Air A1466, the logic board is easy to repair, so keep it up your nearly there. With the fan spinning 100% thats always almost synonymous with the trackpad not working, i would be suprised if it is not, check your trackpad and trackpad/keyboard flex cables etc....Last edited by Simplebeans; 06-03-2022, 02:13 PM.Leave a comment:
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Re: Macbook Air 820-3437B missing PP3V3_S5
Thanks also can you post voltages for
P5VS4RS3_EN - measure this at U7501 PIN # 4
PPBUS_S5_HS_OTHER_ISNS measure this at U7501 PIN # 23
and L7520 measure both PIN’s # 1/2...Last edited by Simplebeans; 06-01-2022, 04:31 PM.Leave a comment:
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