How To Check Fault Symptom - Samsung UN40J5300AG Service Manual

4. Troubleshooting

4-2. How to Check Fault Symptom

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