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Troubleshooting
7-2-7 Switch Descriptions of the Logic Main Board
1) Internal Pattern: Switch Off (Down Position) #2, #4 and Switch On #3 (Up) on SW2001
2) External Pattern: Switch On (Up) #2, #4 and Switch Off #3 (Down) on SW2001
* Switch to the internal pattern for board inspection
* 1 on SW2002 is not used.
!Verify that the output voltages are 5V
and 3.3V when the SMPS is used.
@Set the oscilloscope to 4ms/div and 2V/div.
Connect Probe 1 as illustrated and set it to trigger.
Using Probe 2, analyze the waveforms at each point.
GT 5
[Fig. 2] Connecting the Oscilloscope s Probe 1
#Turn the set ON to apply the 5V and 3.3V power to the Logic Main Board.
Check whether the Vsync LED is blinking (located on top left side of the Logic Main Board).
An LED that is blinking too fast or does not light up means the Logic Main Board is abnormal.
$Verify each waveform of the Logic Main Board and compare them to waveforms shown below.
Each and every waveform should be verified.
%After finishing, turn off the power.
^When the inspection is finished, set SW2001 to the External Pattern.
7-14
V _T OGG_M
LOGIC BOARD
M O DEL
OPTION S/W
Inside
42 SD
1 2 3 4
Outside
42 SD
1 2 3 4
REMARK
ON
3 ON
O F F
ON
2 , 4
O N
O F F
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