Lenovo E470 Hardware Maintenance Manual

Also see for 20H4: User guide

Error messagesTable 3. Error messagesSymptom or error FRU or action, in sequenceFan error. 1. Replace the fan.2. Apply thermal grease.3. Replace the system board.Thermal sensing error. Replace the system board.This system does not support batteries that are notgenuine Lenovo-made or authorized. The system willcontinue to boot, but may not charge unauthorizedbatteries.Attention: Lenovo has no responsibility for theperformance or safety of unauthorized batteries, andprovides no warranties for failures or damage arising outof their use.Replace the battery.Beep symptomsTable 4. Beep symptomsSymptom or error FRU or action, in sequenceFour cycles of four short beeps Replace the system board.One short beep, pause, three short beeps, pause, threemore short beeps, pause, and one short beep1. Replace the memory module.2. Replace the system board.Three short beeps, pause, one short beep, pause, onemore short beep, pause, and three short beepsRemove the device from ExpressCard slot.Five short beeps Replace the system board.One long and two short beeps Replace the system board.Five short beeps, pause, five short beeps, and pause Replace the system board.No-beep symptomsTable 5. No-beep symptomsSymptom or error FRU or action, in sequenceNo beep, power-on indicator on, LCD blank, and noPOST.1. Ensure that every connector is connected tightlyand correctly.2. Reseat memory module.3. Replace the system board.No beep, power-on indicator on, and LCD blank duringPOST. 1. Reseat memory module.2. Replace the system board.The power-on password prompt appears. A power-on password or a supervisor password is set.Type the password and press Enter.The hard-disk password prompt appears. A hard disk password is set. Type the password andpress Enter.Chapter 4. Related service information 41