(4) Problems detected at the main RAM test
Problem Cause Suspected unit
Error message is displayed
(at address C00000h or less)
when the test is finished.
Written data is different from
read data.
Operation control unit
Error message is displayed
(at address C00000h or less)
when the test is finished.
Written data is different from
read data.
ROM board
(5) Problems detected at the system RAM test
Problem Cause Suspected unit
Error message is displayed
when the test is finished.
ROM board is defective. ROM board
(6) Problems detected at the video RAM test
Problem Cause Suspected unit
Error message is displayed
when the test is finished.
Video RAM is defective. Operation control unit
(7) Problems detected at the VGA RAM test
Problem Cause Suspected unit
Error message is displayed
when the test is finished.
VGA chip and peripheral
buses are defective.
Operation control unit
(8) Problems detected at the LCD pattern test
Problem Cause Suspected unit
LCD test pattern is abnormal. VGA chip and control signals
to the LCD are abnormal.
Operation control unit
LCD is defective (there are
dots missing, etc.).
LCD
Back-light is out of control
(always ON).
Inverter is defective. Op-ports 1 and 2
Back-light control signal is
abnormal.
Operation control unit
Trouble -
shooting
SM 6-53 A172/A199
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