Lenovo ThinkPad 570E English - Hardware Maintenance Manual for 570 systems - Page 49

Beep symptoms, LCD-related symptoms

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Beep symptoms Symptom or error One beep and a blank, unreadable, or flashing LCD One long and two short beeps, and a blank or unreadable LCD Two short beeps with error codes Two short beeps with blank screen Symptom-to-FRU index FRU or action, in sequence 1. Reseat the LCD connector 2. LCD assembly 3. System board 1. System board. 2. LCD assembly. POST error. See "Numeric error codes" on page 42. 1. System board. No beep symptoms Symptom or error No beep, power-on indicator on, LCD blank, and no POST No beep, power-on indicator on, and LCD blank during POST No beep, during POST but system runs correctly FRU or action, in sequence 1. Ensure that every connector is connected tightly and correctly. 2. DIMM. 3. System board. 1. Reseat DIMM. 2. System board. 1. Speaker. LCD-related symptoms Important The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). A small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing, discolored, or lighted dots in any background is: SVGA (12.1 in.): 5 or more bright dots, 5 or more dark dots or a total of 9 or more bright and dark dots. XGA (13.3 in.): 8 or more bright dots, 8 or more dark dots or a total of 9 or more bright and dark dots. ThinkPad 570 and 570E 45

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Symptom-to-FRU index
Beep symptoms
No beep symptoms
Symptom or error
FRU or action, in
sequence
One beep and a blank,
unreadable, or flashing LCD
1.
Reseat the LCD
connector
2.
LCD assembly
3.
System board
One long and two short
beeps, and a blank or
unreadable LCD
1.
System board
.
2.
LCD assembly.
Two short beeps with error
codes
POST error.
See
“Numeric error codes” on
page 42.
Two short beeps with blank
screen
1.
System board
.
Symptom or error
FRU or action, in
sequence
No beep, power-on indicator
on, LCD blank, and no
POST
1.
Ensure that every
connector is
connected tightly and
correctly
.
2.
DIMM.
3.
System board.
No beep, power-on indicator
on, and LCD blank during
POST
1.
Reseat DIMM
.
2.
System board.
No beep, during POST but
system runs correctly
1.
Speaker
.
LCD-related symptoms
Important
The TFT LCD for the notebook computer contains
many thin-film transistors (TFTs).
A small number of
dots that are missing, discolored, or always lighted is
characteristic of TFT LCD technology, but excessive
pixel problems can cause viewing concerns.
The LCD
should be replaced if the number of missing,
discolored, or lighted dots in any background is:
±
SVGA (12.1 in.):
5 or more bright dots, 5 or
more dark dots or a total of 9 or more bright and
dark dots.
±
XGA (13.3 in.):
8 or more bright dots, 8 or more
dark dots or a total of 9 or more bright and dark
dots.
ThinkPad 570 and 570E
45