Samsung NP-R50 Troubleshooting

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This Document can not be used without Samsung’s authorization.

5. TROUBLESHOOTING

5-1 General Information

1) Troubleshooting Tools O System Diagnosis Disk O MS-DOS System Disk O System Diagnostic Card O (+),(-) Screwdriver O Tweezers O Multimeter O Oscilloscope O Logic Analyzer

2) Field Replaceable Unit O Memory Module O 1.8” HDD O Wireless LAN Module O MDC Module O 5-IN-1 Board O Keyboard O Touchpad O LCD O LCD I/F Cable O LCD Inverter O HDD FPC O LED/Touchpad FPC O MAIN Board O MDC Cable

5-2 System Diagnosis I

1) System Diagnostic Card

The Diagnostic Card is inserted into the MINI PCI slot and displays the

system operating status during the POST (Power On Self Test) in a 2-digit hexadecimal value.

SENS R50

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5. TROUBLESHOOTING

The Diagnostic Card is used to evaluate the cause(s) of any abnormal

operations of the system without disassembling the system or to test the system after the replacement of the FRU.

2) Debugging Codes In general, if a fault of a circuit or part is detected during the system test, the

system stops with a code. The debugging codes for system board faults are listed below.

CODE Description Check Item

02 03 04

06 08

09 0A 0B 0C

0E 0F

Check CPU Real Mode Change Disable Non-Maskable Interrupts (NMI) Read the CPU type from the CPU internal register. Initialize System Hardware (DMA,RTC) Set the default values for the Chipset Register. Set the Port Flag Initialize the CPU Register Initialization Enable the CPU Cache Set the default values for the CPU Cache Register. Initialize I/O Initialize the Storage Media Initialize the Power Manager Initialize the Register

Check that the CPU is supported/Replace the board.

18 1A

Initialize PCI Bus Master Reset Initialize the Keyboard Controller Check the BIOS ROM Checksum Check the BIOS ROM/Check after BIOS update Initialize the 8254 System Timer Initialize the 8237 DMA Controller Check the DRAM Refresh Operation Check the 8427 Keyboard Controller Check the DRAM Memory

SENS R50

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5. TROUBLESHOOTING

CODE Description Check Item

32 Measure the CPU speed 34 Check the CMOS value

38 Copy the BIOS information to memory 3A Check the CACHE size 3C Set the initial value for the Chipset Register

according to the value saved in the CMOS.

3D Set the initial value for the Super I/O Register

according to the value saved in the CMOS. 42 Initialize the Interrupt Vector 44 Initialize the BIOS Interrupt 46 Check the ROM Copyright 48 Check the video settings using CMOS. 49 Initialize the PCI bus and devices Check after removing the PCI device

4A Initialize the video adapter Check the circuit around the graphic chip 4C Copy the Video BIOS information to memory

50 Display the CPU type and clock speed 52 Check the keyboard 56 Activate the keyboard

5C Check memory (512K~640K)

60 Check Extended Memory

Remove the RTC battery and check if the CMOS is initialized.

Check the memory module installation status/

Check after a memory replacement 62 Check the Memory Address line 66 Set the initial value for the CPU Cache Register

according to the value saved in the CMOS.

6A Display the External Cache Capacity

72 Check Configuration Error 76 Display Keyboard Error

7C Initialize the Hardware Interrupt Vector 7E Initialize the Auxiliary Processor

84 Initialize and check the Parallel Port 86 RE-INT ON-BOARD I/PORT 88 Initialize the BIOS Data Area (BDA)

SENS R50

Check after the RTC Reset

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5. TROUBLESHOOTING

CODE Description Check Item

8C 9C 9E A0 AA AC B0 B4 B6 B7 BA BE C0

Initialize the Extended (BIOS) Data Area (EBDA) Initialize and check the FDD Controller Setup Power Manager Enable Hardware Interrupts Set the Time/Date Check if the F2 key has been pressed Enter SETUP Check all errors occurring during POST Beep once Check the password Check after RTC Reset Initialize the ACPI BIOS function Initialize DMI Clear Screen Boot the OS after completing BIOS POST Check the booting priority change in the BIOS

SETUP / Reinstall the OS

SENS R50

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5. TROUBLESHOOTING

3) Location of Fault and Check Points by Symptom

LCD Related Symptoms

1. The LCD screen is dimmer or the screen color is distorted. Æ Check the connection status of the LCD cable connector of the main board and the connection between the LCD cable and LCD inverter. Æ Replace the LCD cable or LCD inverter.

2. No picture is displayed on the screen. Æ Check the connection status of the LCD cable connector of the main board and the connection between the LCD cable and LCD inverter.

Æ Replace the LCD cable or LCD inverter. Æ Check if the memory module is out of order.

3. Cannot adjust the LCD screen brightness.

Æ Check if the LCD inverter is out of order. Æ Check the BIOS version information or check if the adapter is appropriate.

4. The LCD blinks during use. Replace the LCD cable and the LCD inverter and check if they are out of order. Æ Check if the adapter is the appropriate one.

Main System Related Symptom

5. Cannot turn the system on. Æ If the AC adapter is not connected, check the battery charge status. Even if the battery is charged, if the remaining battery charge is too low, you may not be able to boot up the system.

Æ Check if the On Top Board or part of the On Top Board is out of order. Æ Check if the DC/DC Board is out of order. Æ Replace the Main Board.

6. The system is turned on, but booting fails or the power turns off immediately. Æ Since this may happen due to a short circuit within the system, immediately

SENS R50

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5. TROUBLESHOOTING

disconnect the power from the wall outlet and check if there are any alien objects such as a loose screw within the product.

Æ Check the connectivity of the connection FPC and cables. Æ Replace the DC/DC Board and check if the board is out of order. Æ Replace the memory module and check if the module is out of order. Æ Replace the Main Board.

7. Cannot insert a PCMCIA card or the remove button does not work properly.

Æ This may happen when the insulator within the PCMCIA slot is pushed inward. Æ Replace the PCMCIA slot frame and check if it is out of order.

8. Cannot hear the sound.

Æ Check if the volume is set to Mute in the Operating System. Æ Check the connectivity of the speaker cable and check if the speaker is out of order. Æ Check if the Audio Board is out of order. Æ Replace the Main Board.

9. The HDD is not recognized. Æ Check the connectivity of the HDD FPC cable and check if the FPC cable is out of order by replacing it with a new one. Æ If the HDD is recognized by the CMOS but the ‘Operating System Not Found’ message appears while booting, format the HDD and reinstall the operating system as this may happen when the operating system is corrupted or the HDD is out of order. If this does not work, replace the HDD.

10. The touchpad does not work or is working abnormally.

Æ Check the connectivity of the touchpad connection cable. Æ Replace the touchpad module of the Top Assy and check if it is out of order.

11. The battery is not charged or the battery charge LED malfunctions.

Æ Check the standard power voltage of the adapter. Æ Replace the DC/DC board and check if the board is out of order. Æ Check if the battery is out of order.

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