Lenovo ThinkPad 770 Hardware Maintenance Manual for 770 series notebooks(Janua - Page 63

Beep Symptoms, No Beep Symptoms

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SYMPTOM-TO-FRU INDEX Beep Symptoms Symptom / Error Continuous beeps. One beep and a blank, unreadable, or flashing LCD. One beep, and the message "Unable to access boot source." One long and two short beeps, and a blank or unreadable LCD. One long beep followed by four short beeps each time the power switch is operated. (System cannot power on due to low battery voltage.) One beep every second. (System is shutting down due to low battery voltage.) Two short beeps with error codes. Two short beeps with blank screen. FRU / Action in Sequence 1. Reseat the CPU card. 2. Reseat the video card. 3. System board 1. Reseat the LCD connector. 2. Reseat the CPU card. 3. LCD assembly 4. System board 5. CPU card 1. Boot device 2. System board 1. Reseat the video card. 2. Reseat the CPU card. 3. Video card 4. System board 5. LCD assembly Connect the AC Adapter or install a fully charged battery. Connect the AC Adapter or install a fully charged battery. (Allow the system to completely shut down before changing the battery.) POST error. See "Numeric Error Codes" on page 52. 1. System board No Beep Symptoms Symptom / Error FRU / Action in Sequence No beep, power-on indicator not on, and a blank LCD during POST. 1. Go to "Power Systems Checkout" on page 36. 2. System board 3. Check the power outlet. No beep, power-on indicator on, and a blank LCD during POST. 1. Reseat the CPU card. 2. System board No beep, power-on indicator on, and a blinking cursor only during POST. 1. System board ThinkPad 770, 770E, 770X and 770Z 57

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SYMPTOM-TO-FRU INDEX
Beep Symptoms
Symptom / Error
FRU / Action in Sequence
Continuous beeps.
1.
Reseat the CPU card
.
2.
Reseat the video card.
3.
System board
One beep and a blank,
unreadable, or flashing
LCD.
1.
Reseat the LCD
connector
.
2.
Reseat the CPU card.
3.
LCD assembly
4.
System board
5.
CPU card
One beep, and the message
“Unable to access boot
source.”
1.
Boot device
2.
System board
One long and two short
beeps, and a blank or
unreadable LCD.
1.
Reseat the video
card
.
2.
Reseat the CPU card.
3.
Video card
4.
System board
5.
LCD assembly
One long beep followed by
four short beeps each time
the power switch is
operated.
(System cannot power on
due to low battery voltage.)
Connect the AC Adapter
or install a fully charged
battery.
One beep every second.
(System is shutting down
due to low battery voltage.)
Connect the AC Adapter
or install a fully charged
battery. (Allow the
system to completely shut
down before changing the
battery.)
Two short beeps with error
codes.
POST error.
See
“Numeric Error Codes” on
page 52.
Two short beeps with blank
screen.
1.
System board
No Beep Symptoms
Symptom / Error
FRU / Action in Sequence
No beep, power-on indicator
not on, and a blank LCD
during POST.
1.
Go to “Power
Systems Checkout”
on page
36.
2.
System board
3.
Check the power
outlet.
No beep, power-on indicator
on, and a blank LCD during
POST.
1.
Reseat the CPU card
.
2.
System board
No beep, power-on indicator
on, and a blinking cursor
only during POST.
1.
System board
ThinkPad 770, 770E, 770X and 770Z
57