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2
Power supply trouble (DVB
Power supply trouble (DVB
N
Check U15 Pin 3 for 12V pulse
Y
L16 open
or
damaged
NO 12V
Check The PCB board isn`t
open or in short circuit from
F1 to U15 Pin 2
-
-
T)
T)
Check E43/470μF/16V for 5V
N
Check U15 Pin
NO.2 for 12V
input，Pin
NO.7 for 3.3V
NO 3.3V
Check U6/MCU Pin NO.
5 for 3.3V output
Or change U6/MCU
U22 is
N
damaged
and
change it
1 U22 is damaged and
2 Check the back
Check U22
（AIC1084-
33PM）for
3.3V output
N
Check U22
Check U34
for 5V
for 1.2V
input
output
Y
N
Check U34
Check
Check the
U22
circuit
output
before
is in
U22
short
Check
circuit
U34
isn`t in
Y
short
circuit
change is。
N
circuit
Y
Check U32
（AZ1117H
-1.8）for
1.8V output
N
Y
Check U32
for 5V
input
Y
N
Check
U32 and
for 3.3V
change
input
it
Y
Y
1 U34 is damaged and
change is。
2 Check the back circuit
U34 is damaged and
change it
N
Check
U32
Front
Circuit for
power
supply
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