37
TROUBLE SHOOTING
1. Power (Power Board)
1. Power does not turn on.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Power does not turn on.
POWER_LED is not blinking red. Refer to "2. LED blinking".
Is the fuse of F501 normal?
Check abnormalities of the circuit of a primary side.
(Such as D501,D502,D503,D504,Ce501,Q501,U501)
Defect parts should be exchanged.
After-repair Hughes is exchanged.
Check 5VSTB(CN502#1).
Is output voltage about 5.2V?
Refer to "3. Power board".
Check PCON(CN502#2).
Is input voltage about 2V?
Check abnormalities of the connection circuit of
PCON. (Such as Q506)
Defect parts should be exchanged.
When there are no abnormalities in a POWER board,
MAIN PCB can be exchanged.
Check +5V(CN502#3).
Is outut voltage about 5.1V?
Check abnormalities of the connection circuit of +5V.
(Such as Q512,Q505)
Defect parts should be exchanged.
When there are no abnormalities in a POWER board,
MAIN PCB can be exchanged.
Check +12VA(CN502#9).
Is output voltage about +12V?
Check abnormalities of the connection circuit of +12V.
(Such as D511,Q510,Q509,Q508,Q507,ZD503)
Defect parts should be exchanged.
When there are no abnormalities in a POWER board,
MAIN PCB can be exchanged.
Check -12VA(CN502#11).
Is ouput about -12V?
Check abnormalities of the connection circuit of -12V.
(Such as D512,Q511,ZD504,U512)
Defect parts should be exchanged.
When there are no abnormalities in a POWER board,
MAIN PCB can be exchanged.
Check +12VM(CN502#7).
Is output about +12V?
Check abnormalities of the connection circuit of +12V.
(Such as Q507,Q508)
Defect parts should be exchanged.
When there are no abnormalities in a POWER board,
MAIN PCB can be exchanged.
Abnormality of the board for MAIN, replace the MAIN
PCB.
No
No
No
No
No
No
No
No
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