How To Check Fault Symptom - Samsung UE40H5003AW Service Manual

4-2. How to Check Fault Symptom

Diagnostics
Check 'Power of main IC(B1.15V)' appear
Power cord on.
Yes
Check 'Stand-By A5.3V'
5.3V appear at BD210?
0V to A13V (CN202 #3)
Yes
Set On.
Yes
Check 'SW_POWER' more than 3.3V
appear at CN202(#6)
0V to 3.3V↑ (CN202 #6)
Yes
at BD917
Check 'Power of DDR IC(B1.5V)' appear
at BD911
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.
No
Measure : Change 10p power cable
and SMPS.
Cause : Main IC(NT14L) did not
control the SW_Power.
No
Measure : Change the Main Assy.
Cause : There is problem at
DCDC(IC201)/LDO(IC204).
No
Measure : Change the Main Assy.
Cause : There is proble at FET(Q202_
NFRC) or Main IC(NT14L) did
No
not control the SW_PVCC.
Measure : Change the Main Assy.
No Change the Panel.
4. Troubleshooting
4-3