4-2. How to Check Fault Symptom
4-2-1.No Power and No Video
Symptom
The LEDs on The front panel do not work when connecting The power cord.
•
The SMPS relay does not work when connecting The power cord.
•
The units appears to be dead.
•
Major
checkpoints
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.
•
Check the fuses of each part.
•
Check the output voltage of SMPS.
•
Replace the Main Board.
•
Diagnostics
Power cord on.
Yes
Check ‘Stand-By A13V’
13V appear at BD207_NOFF/BN210_
OFF?
13V (CN201 #3/5/7/9)
-
No
Cause
: There did not supply the
power from SMPS.
Measure
: Change 10p power cable
and SMPS.
Yes
Set On.
Yes
Check ‘A_POWER’
Check ‘A1.26V’ appear at
1.26V (L203)
Check ‘A3.3V’ appear at
3.3V (IC201 #1)
Check ‘A5V’ appear at
5V (L202)
No
Cause
: There did not supply the
power from SMPS.
Measure
: Change 10p power cable
and SMPS.
Yes
Check ‘SW_POWER’
more than 3.3V appear at CN201(#2)
3.3V↑ (CN201 #6)
No
Cause
: Main IC(IC1001) did not
control the SW_Power.
Measure
: Change the Main Assy.
Yes
Check ‘B_POWER’
Check ‘B1.8V’ appear at
1.8V (IC204 #5)
Check ‘B3.3V’ appear at
3.3V (IC205 #5)
Check ‘B5V’ appear at
5V (Q207 #1/2/5/6)
No
Cause
: There is proble at DCDC/
LDO.
Measure
: Change the Main Assy.
Yes
4-4
4. Troubleshooting