How To Check Fault Symptom; Power And No Video - Samsung UE40F8000SL Service Manual

4. Troubleshooting

4-2. How to Check Fault Symptom

4-2-1. NO Power and No Video
Power indicator LED is on?
Check 'Stand-By A5V' 5V appear at
5V (CN202 #3)
-
Check 'SW_POWER_TO_SMPS' more
than 3.3V appear at CN204(#8)?
3.3V (CN204 #8)
-
Check 'Power input of Main Ass'y' ?
DC B13V, B5.3V appear at CN202 #3, 11,
13, 21, 23 (B13V) CN202 #1, 3 (B5V)?
13V (CN202 #9, 11, 13, 21, 23)
-
5V (CN202 #3, 10)
-
Check 'Power of main IC (B1.0V/B1.1V/
B3.3V)' Check 'Power of DDR IC(B1.5V)'
appear at BD224(1.0V), BD234(1.1V),
BD239_LD, BD225, BD226, BD227,
BD242(3.3V) BD228, BD222(1.5V)
Check 'Power of LVDS (13V)' appear at
TP-PANEL_VCC?
0V to 13V (IC1201 #7, 8)
-
Change the LVDS cable ?
4-4
Yes
BD204?
Yes
Set On
Yes
Yes
Yes
Yes
Yes
No Check the power cord connection.
Cause : There did not supply the power from SMPS.
No
Measure : Change 26P power cable and SMPS.
Cause : Micome (IC2201) did not control the SW_
Power.
No
Measure : Change the Main Assy.
Cause : There did not supply the power from SMPS.
No
Measure : Change 26P power cable and SMPS.
Cause : There is problem at DCDC (IC202, IC213,
IC204, IC201)/LDO
No
Measure : Change the Main Assy.
Cause : There is probem panel or T-con board or
Main assy.
No
Measure : Change the Main Assy.
No Change the Panel.