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Hey
After the arrival of the PD 100W source, I tested the board again and it worked well... I had already repaired the board, changed a capacitor and was unable to turn it on because my power source was lower than the minimum required (96W), as reported by [USER="295753"]mon2[/USER] .
Thank you very much for the tip and support in repairing this complex logic board.
PS. The Desktop GaN USB Type C PD Charger is unreliable, but it powered the board without a battery.
Thanks to everyone who helpedmon2
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Okay, you're right.
I'll look for another one of more reliable quality.
Thanks
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Very good, thank you very much for the tips.
I have already ordered a 100W PD charger (total 240W), according to the manufacturer.
Desktop GaN USB Type C PD Charger, Fast Charging, Mobile USB 3.0, 8 Ports, 240W - Aliexpress
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ppbus_g3h 12.65V
discharged battery. The power supply I am using is 65W.
Q7065 (G) CHGR_BGATE = 12.65V - PPVBAT_G3H_CHGR_R (S) 12.65V - PPVBAT_G3H_CONN = 0V.
I will order another new battery to install.
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Could anyone get me the block diagram of the power sequence for this 820-001700 board?
There is no such page in my schematic.
The board has changed the nature of the problem a little... Now it turns on the initial sources and turns them off.
I suppose there is a short in a secondary source S3, S0...
With the source connected, it produces 20V and the current varies from 0 A to 0.5 A in approximately 10s
By pressing the power button, the fans rotate and the current goes up to 2.5 A and returns to 0 ALast edited by Sergio Kub; 06-21-2024, 07:01 PM.
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BIOS Acer 515--45-R760 Board DAZAURMB8D0 REV D
Someone might be in need.
I copied it from a working notebook....
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I will try to turn on the power and simultaneously inject 3V into the output of the U7800 and observe the electrical current
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The board does not turn on
PP3V3_S5 and PP1V8_S5 missing
I put the board in the computer and checked that the Power key was working.
If I keep the power key pressed for about 5s the current goes to 0A on the external source.
I didn't find a short in these sources.
I observe strong heating in the U9300 and U 9200 by around 55ºC.
I don't have much experience with this 820-01700 board, but it's strange
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Measure the outputs of the IC (U7800) and all with high resistance.
The lowest resistance outputs were B1 8.7 Ohms and L16 47.5 Ohms, which I think is ok
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18.2 K Ohm... measured at R9802 (1)
Is there an enable for this source on this IC?
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I checked this voltage sequence and it stopped at PP3V3_S5...
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820-01700 No Power, PP3V3_S5 missing.
820-01700 No Power, PP3V3_S5 missing.
I think the board doesn't turn on.
I have power on directly on the board in SWK001
External power supply with digital volt/amp and shows 20V and 0.350A.
LDO Voltages Ok
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I cleaned it with isopropyl alcohol and re-soldered the board in the area of the Bil Connector (J6955) and it was fine. Thank you very much !
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This Mac was showing this defect, I turned the J6955 off and on again and it started working again.
Now it stopped again and went into hibernation.
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J6950
1, 2, 3 GND 0V
4 - 3.456V
5 - 0V
6 - 3.456V
7, 8, 9 - 12.08V
* Measurements with the battery plugged inLast edited by Sergio Kub; 05-31-2024, 03:52 PM.
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Good afternoon,
I'm repairing a board similar to this one and with the same symptom:
Turns on, but stays in sleep with the light on.
I took these voltage measurements and [B]PPBUS_G3H[/B] 12.61V - SMC_PM_G2_EN 3.3V - PP5V_S3_AUDIO 5V - all_sys pwrgd = 3.3VGood afternoon,
I'm repairing a board similar to this one and with the same symptom:
Turns on, but stays in sleep with the light on.
I took these voltage measurements and [B]PPBUS_G3H[/B] 12.61V - SMC_PM_G2_EN 3.3V - PP5V_S3_AUDIO 5V - all_sys pwrgd = 3.3VGood afternoon,
I'm repairing a board similar
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Great to know.
But I changed the battery meter board and it was fine. I had never seen a defect like this.
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