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5
How to Diagnose the PD
History
Frequency
Indication in
Assy
of LED
Factory Mode
Flashing
Red,
MR-PWR
MAIN
once
BLOCK
Assy
POWER
SUPPLY
Unit
Note: Although replacement of the whole POWER SUPPLY Unit is required (replacement of only defective parts on the POWER SUPPLY Unit is not possible),
the circuit symbols are described for reference
5
6
Cause of power-
Point to be
down (activated
Checked
protection circuit)
Overcurrent in
5V_ANT-REG
6.5 V power
5V_IO-REG
3CH-DD
converter
FET
1CH-DD
converter
Overcurrent in
FAN-REG
12 V power
8V_IO-REG
LNB
Overcurrent in
12V_IO-REG
17 V power
Overcurrent in
1.8V_IO-REG
3.4 V power
V+6.5V
TP V+6.5V
UVP
V+12V
TP V+12V
UVP
V+17V
TP V+17V
UVP
STB3.4V
TP STB3.4V
OCP
STB5.1V
TP STB5.1V
OCP
VCC
TP V+6.5V
OCP
TP V+12V
TP V+17V
STB3.4V
TP STB3.4V
OVP
VCC
TP V+6.5V
OVP
TP V+12V
STB3.4V
TSD
V+6.5V
Rectifier diode (D351)
TSD
6
7
Possible Defective Parts
IC4305, C4305
IC4310, C4301
IC4402
C4405, C4406, C4409, C4463, C4464, C4466 to C4468
Q4417, Q4416, Q4411
IC4501, C4517
IC4302, C4342
IC4309, C4315
IC4503
IC4308, C4303
IC4604, C4609
C4820, C8103
Voltage drop due to overcurrent on the load side
Voltage drop due to overcurrent on the load side
Voltage drop due to overcurrent on the load side
C151, C153, C152, D152, or Z152, and abnormal current on the load
side that is connected to STB3.4 V power
C155 and abnormal current on the load side that is connected to STB5.1 V power
And abnormal current on the load side that is connected to STB5.1 V power
D351, C351, C352, C353, and abnormal current on the load side that is connected to V+6.5V power
D352, C357, C358, and abnormal current on the load side that is connected to V+12V power
D353, C359, and abnormal current on the load side that is connected to V+17V power
PC121
PC301, Breakage in the line to/from the P2 output connector
Z121 control IC and abnormal current on the load side that is connected
to STB3.4 V power
D351 or D352, and abnormal current on the load sides that is connected
to V+6.5 V and V+12 V
KRP-M01
7
8
A
B
C
D
E
F
59
8

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