4-2. How to Check Fault Symptom
Diagnostics
Power cord on.
Yes
Check ‘Stand-By 13V’
13V appear at
BD210?
0V to A13V (CN202 #3)
No
Cause
: There did not supply the
power from SMPS (
DC VSS-
LED PD BD)
.
Measure
: Change 10p power cable
and SMPS (
DC VSS-LED
PD BD)
.
Yes
Set On.
Yes
Check ‘SW_POWER’ more than 3.3V
appear at B_POWER_EN)
0V to 3.3V↑ (B_POWER_EN)
No
Cause
: Main IC(NT14M) did not
control the SW_Power.
Measure
: Change the
ASSY PCB MAIN
.
Yes
Check ‘Power of main IC(B1.15V)’ appear
at
L301 #2
Check ‘Power of DDR IC(B1.5V)’ appear
at
BD21
No
Cause
: There is problem at
DCDC(IC310)/LDO(IC204).
Measure
: Change the
ASSY PCB MAIN
.
Yes
Check ‘Power of LVDS (13V)’
appear at TP-PANEL_VCC?
0V to 13V (TP-PANEL_VCC)
No
Cause
: There is proble at FET(Q201_
NSHP) or Main IC(NT14M)
did not control the SW_PVCC.
Measure
: Change the
ASSY PCB MAIN
.
Yes
Change the LVDS cable ?
No
Change the Panel.
4-2
4. Troubleshooting
