3.3V
0V
TROUBLE SHOOTING
1. POWER
1.1. The unit does not power on
YES YES
YES
NO
NO
YES
NO
NO
Does the power indicator
on the front panel ash in
green when the power is
turned on?
Has a fuse broken?
Does the power display
on the front panel change
to lighting in green after
approximately 10 seconds?
Check the voltage of pins 1,
5, 7 of CN761 on the DIGITAL
PCB while the power display
is ashing in green.
Disconnect the MAIN PCB connector (BN501).
Check the "
3.5. Protection history display
mode
"
(See 45 page)
The unit does not power on
Has a fuse broken?
Does the power indicator on the
front panel ash in red when the
power is turned on?
Is DC5V being supplied from
the SMPS PCB (BN601) to
the DIGITAL PCB?
See "
1.2.Fuse is blown.
"
See "
1.2.Fuse is blown.
"
Check the microprocessor ## circuit from
CN741 in the DIGITAL PCB, and replace
any faulty items.
TO "
3.5. Protection
History Display Mode
"
(See 45 page)
Are any parts not fully
connected in the connectors
that connect the PCBs?
Is DC5V output even when
the connector (CN741)
supplying power from the
SMPS PCB to the HDMI
PCB is removed?
Check the circuits around
the Microprocessor on the
DIGITAL PCB and replace
any faulty parts.
Check for breakages and short
circuits in the circuits and parts
between CN741 on the DIGITAL PCB
and the microprocessor power supply
and replace any faulty parts.
Connect the connectors correctly.
TO "
6. SMPS
"
(See 84 page)
NO
YES
YES
YES
NO
NO NO
YES
Check for leaks and short
circuits in the parts on the
primary side. Replace any
faulty parts.
Broken fuse
Check the rectier diode in
the rectier circuit on the
secondary side, and check
the circuit for short circuits.
Replace any faulty parts.
Replace the fuse after repair.
Check for short circuits between the
regulator output terminal and GND in
the power supply stabilization circuit.
Replace faulty parts if there is a short
circuit.
1.2. Fuse is blown
74
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