How To Check Fault Symptom; No Power And No Video - Samsung UE32EH5 SERIES Service Manual

4-2. How to Check Fault Symptom

NO Power and No Video

„
• The LEDs on The front panel do not work when connecting The power cord.
Symptom • The SMPS relay does not work when connecting The power cord.
• The units appears to be dead.
The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are
improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
• Check the internal cable connection status inside the unit.
Major
• Check the fuses of each part.
checkpoints
• Check the output voltage of SMPS.
• Replace the Main Board.
Diagnostics
Power cord on.
Yes
Check 'Stand-By A5.3V' 5.3V appear at
BD210?
0V to 5.3V (CN201 #4)
Yes
Set On.
Yes
Check 'SW_POWER' more than 3.3V
appear at CN201(#2) ?
0V to 3.3V↑ (CN201 #2)
Yes
Check 'Power input of Main Ass'y' ?
DC B13V, B5.3V appear at CN201
#11,12,13(B13V) CN201 #1,3 (B5.3V)?
0V to 13V (CN201 #11,12,13)
0V to 5.3V (CN201 #1,3)
Yes
Check 'Power of main IC(B1.2V/B2.5V)'
Check 'Power of DDR IC(B1.5V)' appear
at TP-1.2V, TP-B2.5V, TP-B1.5V(1.5V)
0V to 1.2V (TP-1.2V)
0V to 2.5V (TP-2.5V)
0V to 1.5V (TP-1.5V)
Yes
Check 'Power of LVDS (13V)' appear at
TP-PANEL_VCC?
0V to 13V (TP-PANEL_VCC)
Cause : There did not supply the
power from SMPS.
No
Measure : Change 14p power cable
and SMPS.
Cause : Main IC(X9) did not control
the SW_Power.
No
Measure : Change the Main Assy.
Cause : There did not supply the
power from SMPS.
No
Measure : Change 14p power cable
and SMPS.
Cause : There is proble at
DCDC(IC203) / LDO(IC204).
No
Measure : Change the Main Assy.
Cause : There is proble at FET(Q201)
or Main IC(X9) did not control
No
the SW_PVCC.
Measure : Change the Main Assy.
4. Troubleshooting
4-5