IBM ThinkPad 340 Series Hardware Maintenance Manual page 346

Symptom/Error
Two short beeps with blank
screen.
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.
Before Replacing the LCD
The LCD should not be replaced unless the number of
dots satisfies the following condition:
The number of missing or discolored, or lighted
dots in any colored background is 21 or more.
Note: For Model 755CDV, see also "Model 755CDV
Symptoms" on page 337 for LCD related
symptoms.
Symptom/Error
No beep, power-on indicator
on, and a blank LCD during
POST.
336
IBM Mobile Systems HMM
FRU/Action
System Board
FRU/Action
1. Go to "Power
Systems Checkout"
on page 322.
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. Video Card
4. Processor Card