40
Note
If replacing a part (FRU) does not solve the problem, put the original part back in the computer.
Do not replace a non-defective FRU.
The symptom-to-part index in this section lists symptoms and errors and their possible causes.
The most likely cause is listed first.
Power system checkout
· To verify a symptom, do the following :
1. Power off the computer.
2. Remove the battery pack.
3. Connect the AC adapter.
4. Check that power is supplied when you power on the computer.
5. Power off the computer.
6. Disconnect the AC adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you power on the computer.
· If you suspect a power problem, see the appropriate one of the following power supply checkouts :
1. Checking the AC adapter
2. Checking the operational charging
3. Checking the battery pack
4. Checking the backup battery
· Checking the AC adapter
If the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity
and installation.
If the computer does not charge during operation, go to ‘Checking operational charging’.
To check the AC adapter, do the following :
1. Unplug the AC adapter cable from the computer.
2. Measure the output voltage at the plug of the
AC adapter cable. See the following figure :
2
1
Ground
2
+18.0 ~ +19.2
1
Voltage (V dc)
Pin
Chapter 4. Symptom-to-part index
Ch4. Symptom-to-part index
Summary of Contents for LM40
Page 1: ...0 Service Manual LM40 50 LG Electronics ...
Page 16: ...15 Model Configuration Ch3 System information ...
Page 17: ...16 System Block Diagram Ch3 System information ...
Page 56: ...55 3 Disconnect the keyboard connector Ch5 Removing and replacing a part ...
Page 59: ...58 Ch5 Removing and replacing a part ...
Page 79: ...78 8 Hold M B with your both hand and pull it up to remove Ch5 Removing and replacing a part ...
Page 88: ...87 6 Remove LCD from the LCD rear panel Ch5 Removing and replacing a part ...
Page 107: ...MKD01 MKM33 MKM31 ODD MKM32 MKD04 MKM39 MKD03 106 ...
Page 109: ...108 MKC08 MKM08 MKM32 MKM30 MKM09 MKM10 MKM11 MKM32 MKM06 15 0 MKM07 14 1 MKM30 ...
Page 112: ...111 MKC06 MKM05 MKM30 MKM28 MKM33 MKM33 MKM33 MKM34 MKM33 MKM19 MKM30 MKC01 MKC11 MKC13 ...