Orion LED3241 Schematic
ORION
SERVICE MANUAL
LED3241
1. TV CONNECTION INSTRUCTION
LVDS
INVERTE R
Amlifier
KEY BOARD
IR BOARD
SPEAK
Built in
Power Supply
Power supply
MAIN BOARD
2.CV181H-B
Common problems solution
—Power Chart
—Power Units Problem Solving
—Display Units Problem Solving
—Audio Units Problem Solving
—Functional Units Problem Solving
CV181H-B Power Chart
2.1 Power Units Problem Solving(Mainboard can not boot.)
In stand-by condition,
Check TP1 Whether there is 5V?
Check external
power
N
Check main board TP7 have 3.3V ?
N Y
Check U9 Power
Supply Net
Check point Tp2 have 5V,
TP3 have 12V ， Test point TP4 have
1.26V， Test point TP8 have 3.3V ,
Test point TP5 have 2.5V ?
Y
Normal boot
After power on,
Check the availability of shortcircuit power supply and
motherboard
Check power chip LDO (U4,U11)
work？Check power chip (U3)
work?
YN
OK
2.2 Display Unit (black screen)
Change the LCD,
check if it is ok
Flickering or
Black screen（Back light on）
Check the connection of Driver
Board Cable connect well
N
Y
Change
LCD
N
Check the network output,
J5 cable socket
Works normal
Y
Check the software
match able
Y
Check U8 (MST6M181)
Power supply and clock
circuit chip LVDS output
pin is short circuit,
or open-circuit ？
N
Re-update the software
Check LCD power
VCC-Panel is OK ?
J4 voltage is ok?
Q2 output voltage is
ok ?
N
Change the circuit
Change driver
board cable
2.3 Display Unit (black screen)
Black screen
Main board J6 5，6 pin
Have or not 12V?
Check the Inverter power supply
4pin of J6 output voltage is over 3.3V
N Y
Maintenance power
Y
N
Check power supply circuit
Inverter broke or
bad wire connection
2.4 Audio Unit (no sound)
No sound
If Any audio signal input or
amplifier power supply normal
N
Check the Volume,
MUTE settings
Y
YN
CON3 If any signal output
Check
External audio
equipment
Ampl ifier p ower
supply circuit
Reset
Y
Check
external
Speaker
Check amplifier
power supply circuit
Power supply
normal change U2
N
Maintains U8
Peripheral
circuits，
change U8
N
U2（TPA3110D）3/12
Pin have signal input
NY
Check U8
audio input pin
has the signal output
Y
Check U2 & U8
Connect part
network
N
2.5 Function Unit (ATV broke down)
TV no searching
/no image
Check External RF
signal input
Y
Check the Turner
NO.2,8pin of U5
Have 5V
Y
N
Check Tuner No. 6,7 pin of U5
Have I2C data
Check
external
RF
equipment
Check No.11,12 pin of U5
Y
Check U5&
U8(MST6M181)
connect network
Y
have IF signal
N
Check external circuit
of U5 is OK?
Y
Change
Tuner
N
Repair
its outer
circuit
N
Check pull-up
voltage of I2C
network is
Check
circuit of
U7
normal
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