Re: Lenovo Yoga 7i blown USB port issue
Mon2 and Sephir0th, I truly appreciate your help and patience with me on this. In the end, it was my own mistake that caused this thread to continue needlessly.
I soldered the new TPS2546 correctly aligned to PIN1 this time (now that I know to check the ground plate on bottom of chip indicating PIN1). Everything works now - no more USB errors and all 4 ports work again - including the bad port from the original problem.
Again, I can't thank you both enough!
Rolin
Senior Member
Last Activity: 12-15-2023, 10:03 AM
Joined: 04-16-2007
Location: Mpls, MN
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Re: Lenovo Yoga 7i blown USB port issue
Sephir0th, When I ordered the chip from Digikey, I ordered 2 - so I have a spare. I'll solder a new (untouched) chip properly aligned to Pin1. I'll let you know how it goes!Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
Here are the requested pictures:
1) Original and new chip side by side - top and bottom. (see my previous post - Chip label orientation and ground plate corner indicating Pin1 are different between both chips)
2) Original chip installed on the motherboard
3) both sides of the motherboard.
4) Picture of area with the chip removed...Last edited by Rolin; 06-18-2023, 11:44 PM.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
Thanks Mon2 and Sephir0th for your suggestions. I'll upload the pictures in my next post,
As I mentioned, I'm not experienced at component level repair like this. But Mon2, you brought up a good thing to check - where is PIN1 on both the new and original chip? I soldered the new chip with the label on the chip pointing in the same direction as the original one - that appears to be a rookie mistake. Comparing both the new, I find the ground plate on the bottom has a corner missing indicating PIN1. But the missing corner on both...Last edited by Rolin; 06-18-2023, 11:45 PM.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
Mon2, I was told the owner did charge or power something in one of the ports - I suspected this as well because I've seen more than a few laptops come in for this reason. People should probably consider using a $10 adapter instead of their $1000 laptop - some laptop motherboards can be expensive!
You mentioned to purchase a replacement to restore the USB port - are you referring to the TPS2546 (boardview shows SN1702001RTER)? That has been replaced (but currently removed for testing). Sorry if I'm misunderstanding...Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
"Did anyone here took a closer look to the power rail, so USB_VCCA itself? Resistance ton GND measurement?"
Checked UI2 Pin 12 (+USB_VCCA) a few times. Mostly get no continuity (autorange: OL on meter).. but sometimes did get around 5 M OHMs and climbing reading.Last edited by Rolin; 06-17-2023, 09:53 PM.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
I reinstalled the motherboard in the laptop and tested. Yes, the USB errors are gone. 3 of the 4 USB ports are working (one dead) just as before. Everything looks OK with the chip removed. Maybe I misunderstood what UI2 is for. Is it just for charging external devices through the USB ports? What are the negative effect of removing the 2546 chip?Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
I decided to remove UI2 as a quick test. RC122 is now about 3V on both PIN1 & 2.
As noted above, RC122 resistance tested OK, and this is the required "pull up" 10K resistor for the USB_OC0# circuit. Any ideas on what is causing the fault to trip UI2 PIN13.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
Just tested RC122 again
PIN2 is about 3V, and PIN1 is about .972Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
"Confirm the voltage again to ground of pin #1 of this resistor."
I did check yesterday and believe it was .977V - didn't post it because it was expected since PIN1 directly connects to PIN 13 of UI2.
I'll check it again though. What would be the next step if confirmed .977V?
BTW: Really appreciate your time on this. I'm learning a lot - kind of exciting closing in on the component causing final fault.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
RC122 has about 3V on Pin 2. The resistance slowly rises to about 8.6K - looks out of spec?
Not sure if I need to pull UI2 or not. Hoping not, but let me know. I'm not great at removing and reinstalling QFN16 although it appears I was successful.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
USB_OC0# is .977v (easy to find on UI2 pin 13)
USB_OC3# is 1.8V (again very small, difficult to be sure I have right spot on this one, but fairly confident. checked on RU26 pin1 & RC125 Pin1)Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
Sorry for the mistype of Pin #3, it's corrected now. It's 1.8V
"Check the voltage to ground of USB_OC2#. Post the measurements."
I believe you're looking for measurement on RC9 Pin 1 (or the test pin next to it) - boardview shows it's labeled USB_OC2#. It's 1.8V. But these components are very tiny and the board layout isn't exactly the same - so hopefully I found the right spot (although I'm fairly confident I found it)Last edited by Rolin; 06-12-2023, 10:46 PM.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
UI1 chip has the following: Pin1=5V, Pin2=ground, Pin3=1.814V, Pin4=mv, Pin5=5V
Pin 3 has 1.1814V. Labeled "Open Drain Fault Flag" in datasheet. Can you clarify the meaning? Low voltage means the chip failed?
Typically is this chip blown and simply replacing will solve? Or if more complicated, can I remove 1 leg of this chip to resolve the repeated fault on the USB port?Last edited by Rolin; 06-12-2023, 04:19 PM.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
I received the TPS2546 chip and swapped out the FA3200 chip and I have the same issue - one of the USB ports does not work and keep getting power surge errors on USB port repeatedly in Windows. I should mention that the FA3200 chip (USB Charging QFN16 chip) had a small potmark so I thought it was partially blown.
I don't have a lot of experience with component level troubleshooting on motherboards. But hoping someone can tell me if it's possible to completely disable the failed USB port since the other 3 still work. Like remove...Last edited by Rolin; 06-11-2023, 11:45 PM.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
mon2, thanks for the info. I looked all over for either of the part numbers I noted in my post - no real info, not even a datasheet. I did find the TI SN1702001RTER on Ebay (china location) and see C2542 on the chip as you mentioned, and I also see it in the allexpress.com link you provided. If that crosses to TPS2546, then I'll order through Digikey on Monday and report back. Thanks again for your help.Leave a comment:
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Re: Lenovo Yoga 7i blown USB port issue
I'm a novice/beginner at component level repair, so sorry for what most likely is a basic question. Or maybe it's a really difficult question? Either way, hope someone can assist - thanksLeave a comment:
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Lenovo Yoga 7i blown USB port issue
I have a Lenovo Yoga 7i laptop that has repeated errors in Windows relating to a surge on the USB port - over and over, won't stop (nothing is plugged into any USB ports at the time). I isolated the blown port, and find the other USB ports seem to be working. The USB-C adapter does charge the laptop and power it on.
Opened it up and found a damaged IC. The chip is Fortune Advanced FA3200, called a "USB charging port controller....". The motherboard is GYG51 and I found someone previously posted the schematics and boardview in the forums. Boardview shows the chip (location... -
Re: Dell Laptop - over 14V between Chassis Ground and Circuit Ground?
mcplslg123, yes I mean a "DC" power jack (sorry, it was late). It's on a cable, not soldered on the motherboard. Here is a picture of the style of jack.
I checked the metal on the jack and I also checked on the black wire (of course it's the same). Yes, checking resistance between the black wire on the power jack and a ground trace on the motherboard is not giving 0 ohms like it should. Giving erratic readings, like a capacitor would. Something is shorted.... but this seems like a strange...Leave a comment:
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Re: Dell Laptop - over 14V between Chassis Ground and Circuit Ground?
I removed the motherboard from the laptop case. Testing continuity between ground on the AC jack and ground on the motherboard fluctuates somewhere around 270 kohms but after checking a few times it seems erratic. Next time it gave me around 23 mohms and climbing.Leave a comment:
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