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No Beep Symptoms
Symptom/Error FRU/Action
No beep, power-on indicator
not on, and a blank LCD
during POST.
1. Go to “Power
Systems Checkout”
on page 398.
2. System Board
3. DC/DC Card
4. Power sources
No beep, power-on indicator
on, and a blank LCD during
POST.
1. System Board
2. DC/DC Card
3. Processor Card
No beep, power-on indicator
on, and a blinking cursor
only during POST.
1. System Board
2. Processor Card
3. DC/DC Card
No beep during POST but
system runs correctly.
1. Turn the volume up
and check the
speaker
2. Speaker
3. DSP Card
4. DC/DC Card
LCD Related Symptoms
The TFT LCD for the notebook computer contains over
921000 thin film transistors (TFTs). A small number of
missing, discolored or lighted dots (on all the time) is
characteristic of TFT LCD technology, but excessive pixel
problems can cause viewing concerns.
The LCD should be replaced if the number of dots satisfies
the following condition.
The number of missing, discolored, or lighted dots in
any colored background is 21 or more.
Note: For Model 755CV, see also “Model 755CV
Symptoms” on page 414 for LCD related
symptoms.
Symptom/Error FRU/Action
No beep, power-on indicator
on, and a blank LCD during
POST.
1. System Board
2. DC/DC Card
3. Processor Card
LCD backlight not
working, or
LCD too dark, or
LCD brightness cannot
be adjusted, or
LCD contrast cannot
be adjusted.
1. Reseat the LCD
connectors.
2. LCD Assembly
3. Interposer Card
4. DC/DC Card
ThinkPad 755CE, 755CSE, 755CV, 755CX (9545) 413