4-2. How to Check Fault Symptom
4-2-1.No Power and No Video
Diagnostics
Power cord on.
Yes
Check ‘Stand-By 13V’
13V appear at
BD201?
0V to A19V (CN202 #1)
No
Cause
: There did not supply the
power from Adapter.
Measure
: Change adapter.
Yes
Set On.
Yes
Check ‘SW_POWER’
more than 3.3V appear at Q203(B)
0V to 3.3V↑ Q203(B)
No
Cause
: Main IC(NT14L) did not
control the SW_Power.
Measure
: Change the Main Assy.
Yes
Check ‘Power of main IC(B1.15V)’ appear
at
BD917
Check ‘Power of DDR IC(B1.5V)’ appear
at
BD911
No
Cause
: There is problem at
DCDC(IC201)/LDO(IC204).
Measure
: Change the Main Assy.
Yes
Check ‘Power of LVDS (13V)’
appear at
PANEL_VCC ?
0V to 13V (PANEL_VCC)
No
Cause
: There is proble at FET(Q202)
or Main IC(NT14L) did not
control the SW_PVCC.
Measure
: Change the Main Assy.
Yes
Change the LVDS cable
No
Change the Panel.
4-2
4. Troubleshooting