Rolin
Senior Member
Last Activity: 06-26-2025, 01:14 PM
Joined: 04-16-2007
Location: Mpls, MN
-
I disassembled the lid and removed the LCD screen. FYI for anyone disassembling this model, it uses the removable adhesive strips to attach the screen. I pullled the removal tab located on the bottom and it appeared to break short. Then noticed another tab at the top & pulled to remove completely. Appears this unit has removal tabs at the top and the bottom of the screen for both sides because it uses 1/2 strips instead of full strips.... haven't seen that before. Disconnected the LCD cable from the screen, tested and still shutting off after about 40 seconds. Then I disconnected the... -
Lenovo Legion 5 15IMH05H No Display
I have a Lenovo Legion 5 15IMH05H 81y6003yUS that someone asked me to help them with a failing SSD. I installed a new SSD, fresh Win11 installation, updates, etc. Very standard stuff and everything was completed. He said he'll pick it up in a few days so I shut it down and set it aside.
A few days later came and now it won't POST an image, keyboard lights up, fans spin then shuts itself off after about 40 seconds. I've already tried the typical draining capacitance and removed CMOS battery,etc. No display on an external HDMI monitor as well.. No idea what happened. Suspected a BIOS... -
One more thing I just noticed. I noticed the caps lock LED will go on and off when pressed. But if it was actually running, not sure why it would just shut off in 40 seconds. And I've already tried an external monitor through the HDMI port several times to be sure (before and after the BIOS work)....Leave a comment:
-
Thanks Hardware1, I used your file to program the bios. All appeared to work well through neoprogrammer, I checked all items under "Write IC" (off protect, erase, blank check, write, verify) and it completed successfully. Tried to boot up the laptop, it turned on and off a few times I assuming auto calibrating to the hardware on the laptop, but the final cycle of the boot attempt and it did the same original issue and it turned off by itself (no display throughout). I tried to power on again, and the keyboard lights up, fans spin but no POST and shuts off in about 40 seconds. Same...Leave a comment:
-
I have a Lenovo Legion 5 15IMH05H 81y6003yUS, Serial number PF2GN05C
It was working a couple days ago, put on the shelf. A few days later attempted to power up, no POST, keyboard lights up, fans spin for a little while then shuts off. I've already done the typical draining capacitance and removed CMOS battery,etc. No idea what happened, but I believe some Win11 updates were installing recently, but not sure if that was the last thing done on this laptop before failed.
Here is the bios, hoping it can be repaired or a new bios file to program. BTW: the chip is a winbond 25Q128JVSQ...Leave a comment:
-
Thanks for that info. I had the other boards disconnected to help isolate whether this board was the issue. Reconnected CN1003 to CN6101 (main board) and reconnected the front panel connector for the power button (left connectors to other boards disconnected). Pressed the power button and 3.3 volts is momentarily present then drops off. Looks like the problem is elsewhere. Too bad, hoping for a simple fix. I'll dig deeper and see if I can find anything obvious - but I welcome any suggestions....Leave a comment:
-
Onkyo/Integra DBS-50.2 Blu-Ray Player - Won't turn on or shuts off immediately.
I have an Integra DBS-50.2 Blu-Ray Player that I haven't used in a while. Tried to turn on and it turned on for a brief moment with "hello" on the display then shuts off. Dead from that point on unless I unplug it and try again. Took it apart and checked a few well labeled voltages on the Power Supply board and found the 3.3V isn't measuring on the board (unless I'm misunderstanding what I'm measuring). I have a few pics of the board and schematics. There's a 4 PIN voltage regulator at location IC1301 with a part number 070XFC1 by Sharp that I believe should output 3.3V on PIN2,...
-
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!Leave a comment:
-
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:
-
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:
-
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:
-
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:
-
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:
-
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:
-
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:
-
Re: Lenovo Yoga 7i blown USB port issue
Just tested RC122 again
PIN2 is about 3V, and PIN1 is about .972Leave a comment:
-
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:
-
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:
-
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:
-
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:
No activity results to display
Leave a comment: