No Beep Symptoms; Lcd Related Symptoms - IBM ThinkPad 340 Series Hardware Maintenance Manual

No Beep Symptoms

Symptom/Error
No beep, power-on indicator
not on, and a blank LCD
during POST.
No beep, power-on indicator
on, and a blank LCD during
POST.
No beep, power-on indicator
on, and a blinking cursor
only during POST.
No beep during POST but
system runs correctly.

LCD Related Symptoms

The TFT LCD for the notebook computer contains over
921 000 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
No beep, power-on indicator
on, and a blank LCD during
POST.
LCD backlight not
working, or
LCD too dark, or
LCD brightness cannot
be adjusted, or
LCD contrast cannot
be adjusted.
ThinkPad 755CE, 755CSE, 755CV, 755CX (9545)
FRU/Action
1. Go to "Power
Systems Checkout"
on page 398.
2. System Board
3. DC/DC Card
4. Power sources
1. System Board
2. DC/DC Card
3. Processor Card
1. System Board
2. Processor Card
3. DC/DC Card
1. Turn the volume up
and check the
speaker
2. Speaker
3. DSP Card
4. DC/DC Card
FRU/Action
1. System Board
2. DC/DC Card
3. Processor Card
1. Reseat the LCD
connectors.
2. LCD Assembly
3. Interposer Card
4. DC/DC Card
413