BUENAS, TENGO UN MODELO R400 CON EL MISMO MODELO, REALIZO LOS PASOS QUE OBSERVO PERO EN LA PARTE DONDE DETECTA LA FATA DE PILA NO ENTRA SOLO AL BIOS Y EN VEZ DE ENTRAR MUESTRA OTRA VEZ EL CANDADO, POR QUE SUCEDE QUE DEBO HACER.
hey i tried to update my bios on a lenovo thinkpad t420 .something went wrong and it doesn't power on, it just beep there is a black screen, can you please tell me how to fix it with wincris and if you can please tell us how to put the files inside the usb or how to rename it or i can use the usb bios programmer tool, will that work? Can you please make a video on how to fix a black screen after a bios failed to update
That's because you don't have a power on password, you have a supervisor password. You can remove it but you have to short the eeprom under the computer with wire. There should be guide out there. Just search t400 supervisor password removal.
+Brandon the poster is an idiot. You have to find your EEPROM and shortcut it briefly before password prompt. It gives you an access to BIOS where you have to change the admin password and restart laptop. Later on you may disable all passwords in BIOS
Hello, m also facing this problem.. Im using lenovo t400 thonkpad.. After removing cmos battry it again asking for password.. So plz tell me the solution.. W8ing for ur reply
Good video 👍👍👍 Please I'm looking for a software R24RF08 and ibmpass software, my eeprom p24s08 is blocked I can't read it with ch341a and other systems. Thanks in advance
It literally says "T400" right on the laptop there, chief. This is for a "power on password," if it didn't work for you, that's probably because your password isn't a "power on password."
I'm not going to pull any of the CMOS Batteries in my 4 ThinkPads to find out if the EEPROM Padlock prompt black screen can be bypassed this way. Nor am I going to put the "bad" locked up mobo BACK into my 2004 R51, to test this... Superviser password is not mobo EEPROM password. Trust me. J.C.
IBM ThinkPad EEPROM Chip TThe notebook computer BIOS password is not like the desktop model password, this is easy to explain! The desktop model machine’s computer BIOS password stores it in the motherboard CMOS electric circuit. This electric circuit must depend on the motherboard CMOS battery to maintain its data. Therefore, the majority of desktop model’s BIOS passwords are stored as long as the motherboard CMOS battery doesn’t go dead, or vanish into thin air. However, with the notebook computer, if the CMOS battery is removed, the BIOS password will not disappear at all. The BIOS password is stored in the EEPROM and the CMOS battery will not affect the password. In the notebook computer, the design has a special EEPROM password memory chip. Take the IBM notebook computer as an example, the commonly used memory chip includes: 24C01A, 24C02, 24C03, 24RF08BT, 24RF08CT, 24RF08CM and so on. In different kinds of notebook computers, the EEPROM chip and other kinds of commonly used 93C46. The EEPROM chip belongs to the serial chip. The chip data certainly does not need to draw support from the outside battery to be able to be maintained. In the chip data, which writes data can maintain it for 10 years under the normal temperature. The 24C series chip generally used in IBM ThinkPad 600E machine and the 380, 390, 600 and other models. The 24RF series chip, uses the improvement data transmission and the preserved way. Keeping secret the performance to be stronger generally is used in the 600E later machine, like 600E, A, T and R series. Like the charts below, the IBM TP600 on the notebook computer motherboard EEPROM password memory chip is located on the motherboard nearby the PCI main line control chip. The chip model is AT24C01A. When the user password is established and the preservation of the BIOS is established, the system carries on the operation and compression processing. Then the user inputs the password and processes the password data preservation in the EEPROM password memory chip. It has been clear about the EEPROM chip mode, which the BIOS password saves on the chip and can be located on the motherboard. If you have really forgotten the password, there is a possibility to let "the machine discards" this event occurrence, because each notebook merchant has already inform users not to forget their password. This situation carries on to the maintenance manual, if you are really persist on repairing the notebook then one should prepared himself to take out money to replaces the new motherboard.
Dieses Video ist tatsächlich ein fake-Video ! SO funktioniert das bei dem Lenovo-Notebook nicht, weil die BIOS-Daten nicht gepuffert werden (über die BIOS-Batterie), sondern in einem EEPROM fest gespeichert werden.
***** So, Lenovo started making worse and worse laptops after IBM sold them ThinkPad brand... I had many T-series notebooks. These with IBM logo were waaay better designed in my opinion.
