Toshiba Satellite Pro U300 Maintenance Manual - Page 137

Test Program for Field.

Satellite U300 and Satellite Pro U300 Tests and Diagnostics Manual

33

Subtest 08

"H" Pattern Display

This subtest displays a full screen of "H" patterns.

To exit this subtest and return to the Display Test menu:

Press

Enter

if

NO

was selected for

Test Loop

on the Test Parameter Menu.

Press

Ctrl

+

break

if

YES

was selected for

Test Loop

on the Test Parameter

Menu.

Subtest 9

Video DAC Register W/R/C

This subtest writes data patterns to the Video DAC register lookup table (PEL

Address register), then reads the new data, and compares the result to the

original data patterns. The original content of the Video DAC register is saved

in RAM and restored after the test is completed.

The test data patterns are 00H,15H, 2AH and 3FH.

NOTE

: If

NO

is selected for Test Loop on the Test Parameter menu,

“

Screen will remain blank

”

displays on the screen while the test is

executing. When the test is complete the Display Test menu displays.

If

YES

is selected for Test Loop on the Test Parameter menu, “

The

Screen

will remain blank

” displays on the screen and then the screen flickers due

to the fast screen refresh while the test is executing. Press

Ctrl + break

to

return to the Display Test menu.

HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
























Section	Page
Maintenance Manual	1
SAFETY PRECAUTIONS	3
Conventions	5
Acronyms	5
Keys	5
Key operation	5
User input	5
The display	5
Chapter 1 Hardware Overview	6
Chapter 2 Troubleshooting Procedures	6
Chapter 3 Test Program for Field	9
Chapter 4 Replacement Procedures	10
Appendices	12
Hardware Overview	14
1 Hardware Overview	15
Chapter 1 Contents	16
Features	18
Features	18
1.1 Features	18
1.2 System Block Diagram	23
1.3 2.5-inch Hard Disk Drive	28
1.4 Optical Drive	32
1.4.1 DVD-ROM & CD-R/RW Drive	32
1.4.2 DVD Super Multi Drive	34
1.5 Keyboard	36
1.6 TFT Color Display	37
1.6.1 LCD Module with CCFL Backlight	37
1.6.2 LCD Module with LED Backlight	39
1.6.3 CCFL Inverter Board	41
1.7 Power Rails	42
1.8 Batteries	44
1.8.1 Main Battery	44
1.8.2 Battery Charging Control	45
1.8.3 RTC Battery	46
1.9 AC Adapter	47
Troubleshooting Procedures	48
Troubleshooting	53
2.1 Troubleshooting	53
2.2 Troubleshooting Flowchart	55
2.3 Power Supply Troubleshooting	60
2.4 System Board Troubleshooting	66
2.5 USB FDD Troubleshooting	76
2.6 2.5” HDD Troubleshooting	80
2.7 Keyboard Troubleshooting	85
2.8 Touch pad Troubleshooting	87
2.9 Display Troubleshooting	89
2.10 Optical Disk Drive Troubleshooting	92
2.11 Modem Troubleshooting	94
2.12 LAN Troubleshooting	97
2.13 Wireless LAN Troubleshooting	98
2.14 Sound Troubleshooting	101
2.15 Fingerprint Troubleshooting	103
2.16 Bluetooth Troubleshooting	104
Replacement Procedures	179
4 2	179
4.1 Overview	179
Safety Precautions	180
Before You Begin	181
Disassembly Procedure	182
Assembly Procedure	183
Tools and Equipment	183
Screw Tightening Torque	184
Grip Color	184
Screw Notation	185
4.2 Battery pack	186
Removing the battery pack	186
Installing the battery pack	187
4.3 PC card	188
Removing a PC card	188
Installing a PC card	188
4.4 HDD	190
Removing a HDD	190
Installing a HDD	193
4.5 Wireless LAN card	194
Removing a Wireless LAN card	194
Installing a Wireless LAN card	196
4.6 Memory module	197
Removing a memory module	197
Installing a memory module	199
4.7 Keyboard	200
Removing the keyboard	200
Installing the keyboard	202
4.8 Optical disk drive	203
Removing an optical disk drive	203
Installing an optical disk drive	204
Display assembly	205
4.9 Display assembly	205
Removing the display assembly	205
Installing the display assembly	210
4.10 over assembly	211
Removing the cover assembly	211
Installing the cover assembly	214
4.11 Touch pad	215
Removing the touch pad	215
Installing the touch pad	215
Removing the audio board	216
Installing the audio board	217
System board	219
4.14 system board	219
Removing the system board	219
Installing the system board	221
4.15 CPU	222
Removing the CPU heat sink	222
Installing the CPU	223
4.16 CD unit / FL inverter	225
Removing the LCD unit / FL inverter	225

Toshiba Satellite Pro U300 Maintenance Manual - Page 137

Test Program for Field., Ctrl + break, Video DAC Register W/R/C

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