because I have the same disc on which there is no picture and if I insert these two batteries into this disc, the batteries (external and internal) will be charged
You will not find the motherboard scheme, you only have to check the integrated circuits one by one. Without a battery, it normally detects the lack of it?
The diagram is not available at the moment. Upload photos from both sides in HD, provide the cast of key components. The results of the measurements made are welcome.
You have the model: EU (Systemboard 00HN525) or ver. from the USA? - kbc SMSC MEC1633L-AUE / or MEC1619L-AJZP - you have two Flash cards or one
Read about other platforms in this series NM-Axxx based on the same charger_connector: U7 BQ24760T , housing: QFN40 (4x 10) - I wrote about him on the occasion of the Skylake platform
Page, from cpu / * (SoC, all in one) and charger U7 Link
ps You do not have a warranty? This is a new model from the middle of 2016.
Model Lenovo ThinkPad X240 VIUX1 NM-A091 Rev: 1.0, 2013-04 was on kbc (MEC1633L-AUE) and the same i5-5300U - Lenovo ThinkPad X240. FRU: 04X5162, i7-4600U - Lenovo ThinkPad X240. FRU: 04X5168, i5-4300U
* LA-A901p, same cpu
See page 40, Wisstron Storm platform, cpu: Ivy Bridge ULV + HM77 chipset - charger bq24760 / without the letter T - look if there are differences in the pins - I will check tomorrow at work
Charger changed into another and the same. There is no guarantee. Attachments of photos and voltage measurements. The voltages in brackets refer to the board in which there is charging and there is no picture. Voltages without brackets - the image board works and has no charging.
The BIOS from the disc that has the image has been played to a disc that has no image and is the same.
Cable - one path was damaged and restored on the wire.
see if this BQ circuit .... gets VCC power supply through a 10 ohms resistor ... should have 19V on the crash if not replace this resistor they like to burn ... that's exactly what I exchanged for lenovo flex 3 15 days ago; the resistor had 500 ohms!
Excavations - but maybe it will be useful to someone.
I had a problem, the T450 won't charge and won't get up under the power supply - reason: used internal battery - removing the internal battery did the trick.
The discussion revolves around a charging issue with the Lenovo T450 motherboard (NM-A251), where the system indicates charging but does not actually charge the battery. Participants suggest checking the operational status of the battery and the integrated circuits on the motherboard. They note the absence of a schematic for the motherboard and recommend uploading high-definition photos of the board for further analysis. Voltage measurements from the charger are requested, and several users share insights about potential faults, including a burnt resistor in the charging circuit. Some users mention the importance of the BQ24760T charger and provide links to resources for obtaining schematics. The conversation highlights troubleshooting steps and component checks necessary to resolve the charging issue. Summary generated by the language model.
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