Stephen
Meow Meow MEOW!
Last Activity: Today, 05:12 PM
Joined: 04-03-2020
Location: USA 🇺🇸
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So I discovered some new knowledge or maybe its not new who knows. These computers seem to boot when the USB C chip is somewhat faulty, even if the resistors are good, replacing a faulty CD3217B12 chip will result in the voltage to jump back up to 20Volts and proper amps for charging the battery. I noticed this with each board yet all of them had the same issue, some had different chips to pinpoint. But most of them all resulted in a CD3217B12 chip being swapped out from a donor. I solved two boards and both had faulty CD3217B12 chips. I. had to source a donor board since I know that the 14"...Last edited by Stephen; Today, 01:12 PM. -
Lol I may start one as well. It will be "Logic Board Screws me hard" and my favorite "My logic board is wet"
Also although that IC Amp chip was somewhat the culprit, I did find two faulty resistors on the board RF508 and RF509 was not letting the battery become recognized. The resistors were not bad but they were not soldered down all the way to due corrosion. I replaced them and now it charges fully. Just glad I figured this one out, hopefully with this info I can repair the final 3 pretty quickly.Leave a comment:
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Hey [USER="295753"]mon2[/USER] you will lose your damn mind over this board on what I just discovered. So battery charging issue right, board powers on, after a week of trial and error someone started to rear their head...a stupid SPEAKER amp chip reared its head and was preventing the computer from charging. This is a update for the books. So I replaced the speaker amp, and then the computer started finally charging. I DO NOT know why this would be a result but something tells me it is linked to PPBUS_AON and the amount of power it's getting. I replaced that stupid speaker amp and I...Last edited by Stephen; 04-18-2025, 03:12 PM.Leave a comment:
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I am going to try that. The customer is coming in today to get the DATA pulled first before I do any more repair attempts. We are going to put them in an identical MacBook Pro 14" we have in stock and copy their DATA over so we can work on this on our own time so we can diagnose without pressure. I will replace that next today once we take care of them. Thanks for all your help mon! I will be back here with an updater trying that out. This issue is pretty unique and I would love to solve it so we know what to do next moving forward if we get this type of repair again.Leave a comment:
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[B]USBC1_CC1[/B] = 0.43V
[B]USBC1_CC2 [/B] = 0.43v[B]USBC1_CC1[/B] = 0.43V
[B]USBC1_CC2 [/B] = 0.43v[B]USBC1_CC1[/B] = 0.43V
[B]USBC1_CC2 [/B] = 0.43v[B]USBC1_CC1[/B] = 0.43V
[B]USBC1_CC2 [/B] = 0.43vLeave a comment:
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[B]USBC1_3V3LDO_EN - Not Present. 0 volts [/B]Leave a comment:
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LDO Present on CF508 (3.3v)
LDO Present on CG505 (1.5v)Leave a comment:
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I see. Then I am not getting 1.8Volts on UPC01_5V_EN. No voltage present at RF840 either Suspecting that the USBC chips could be faulty?...Leave a comment:
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OMG. I think I just fixed it with this... HOLD On. I replaced UF840 and that brought voltage and the meter is reading differently now. The amps jumped up a little.
I am now getting 0.26volts at [B]P5VUSBC01_EN_R
UPDATE: jumped to soon. I am getting .26vols at that area now but still getting 20volts 0.00 amps. I think we are making progress.[/B]OMG. I think I just fixed it with this... HOLD On. I replaced UF840 and that brought voltage and the meter is reading differently now. The amps jumped up a little.
I am now getting 0.26volts at [B]P5VUSBC01_EN_RLast edited by Stephen; 04-16-2025, 02:46 PM.Leave a comment:
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[B]P5VUSBC01_EN_R[/B] yes this one NO VOLTAGE PRESENT on this area.
CF840 = 1.8Volts Present[B]P5VUSBC01_EN_R[/B] yes this one NO VOLTAGE PRESENT on this area.
CF840 = 1.8Volts PresentLeave a comment:
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Voltage Present at 12Volts on PPVIN_5USBC01_ISNS = 12Volts
P5USBC01_EN_R - No Voltage present stillLeave a comment:
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I checked the voltage on CF801 and so forth and there is voltage present. I am going to replace my multimeter probes now.Leave a comment:
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This resistor has 12volts so voltage is present on this resistor (RD761Leave a comment:
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RD761- 0.1 OHMS (I check it needs 0.002 ohms)Leave a comment:
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PPBUS_AON is at 12volts exactly while plugged in but those areas have 0 volts present when PPBUS_AON is at 12 volts. I am missing .30 volts which indicates some issue present. I know once I hit that 12.30+ volts I repaired it. But I checked all the resistors and they checked out working and their resistance was in normal standing. I replaced one bad resistor in question but that didn't solve it. So I am still stuck in limbo. I am certain once we figure it out this will solve this problem for all future repairs. Could use this as a reference as well.Leave a comment:
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PPVIN_5USBC01_ISNS = NO VOLTAGE PRESENT
P5USBC01_EN_R = NO VOLTAGE PRESENTLeave a comment:
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Hey [USER="295753"]mon2[/USER] do you have any idea what this means. Sorry to bother you, you been a great help as alwaysmon2Hey [USER="295753"]mon2[/USER] do you have any idea what this means. Sorry to bother you, you been a great help as alwaysLeave a comment:
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No voltage present....Leave a comment:
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I did noticed that CHGR_AUX_DET_3v3 is not showing any voltage at Q5216. Is this normal?Leave a comment:
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Yes, turns on, but won't charge. ISL9240 allows the computer to turn on, also this is a brand new chip on the board so it turned on without issue once it was replaced...charging issue still being a punk.
I have a question, would the 5Volt Regulator chip have anything to do with the charging issue? I am talking about UF800 (this chip was liquid damaged with corrosion but didn't seem like it was bad since the corrosion came off without an issue and all the caps and resistors look good....Last edited by Stephen; 04-15-2025, 03:58 PM.Leave a comment:
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