IBM MT 2643, Hardware Manual

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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
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