mon2., It's like placing a Hot HEATER in front of us. All of a sudden 18 days of continous heat, hope does not last for long.
The resistence of both the pins 11 & 12 are in Mega ohms (Chip Removed). Actually how I found this chip being defective, there was a short on all input caps & this chip getting hot. I removed the caps first but the short was present. Once I removed the chip, short gone. Hopefully this chip is defective. I found the Chip Qr on AE, easily available. I will order it today. Thanks for the help till the chip comes in. TC...

Thanks mon2 for the tips., I checked all the 4 MOSFET & all were 100% ok. Upon more trouble shooting, found that this chip gets very hot, it the 5VALW chip & the number printed on the chip is QrFHB. I have this chip in stock SY8386BRHC (Qq). Is this chip the same as SY8386CRHC (Number printed on the schematics)??? or I have to find the correct chip SY8386CRHC. I was checking AE, I could not find this number. Thanks dear

Dear friends. I am working on a LENOVO THINKBOOK 15 G4 IAP Motherboard No: LA-L931P REV 01. The motherboard turns ON fine with or without battery & AC power, & battery charging is good too. This is for the first time till the power adapter is plugged in. When Laptop is in ON position, as soon as I remove the USB-C main power & plug it back again +20V_VIN is no longer there (Missing) & battery does not charge at all., I thought that the TPS65994-AE Chip was bad., so replaced it with a new good chip, but the problem is still there. On the battery charging chip BQ25710 where pins...

Thank you very much dear for all the help!!! & the Schematics & Boardview, Admin pls. move the schematics/Boardview to the right location., Thanks...

I matched the BIN before programming... Header was 100% same on both but in the middle the DATA was different. You did it very well & the BIOS even was read perfectly. For where did you get the FF FF photo, in the start it was all yy on both???? We are using the RT809H programmer, the program gives the right match for the chip with voltage. This is a 1.8V chip 256KB. Thanks

The RESULT is all back to NORMAL., I was really thinking to discard this board. But anyway all came back to 20V & get the perfect display. Thank you very much....

Thank you so much for all this trouble you have taken for me... Surely will test & inform you the result. Thanks

Dear friends., this Lenovo ThinkBook 15 G4 was 100% working fine till I started to test one USB Power Delivery and USB Type C chip TPS65994AD/AE . The one which I was testing made the motherboard totally dead. Then I re-balled & soldered the Original 100% working TPS65994AD/AE, now it just stuck on 5V. I think the supporting EEPROM U15 program might have got corrupted. Does anyone have the BIN files for U15 (CAT24C256) chip from a working motherboard HLXA4 LA-L931P. I would be very thankful to you guys.
Motherboard Model: HLXA4 LA-L931P Rev: 1A 2022-04-15
S. No : MP2HP316​...