Orion LCD2649 User manual

ORION
SERVICE MANUAL
LCD2649/3249/4050

1. TV CONNECTION INSTRUCTION
KEY & IR BOARD
LVDS
INVERTER
SPEAK
Amlifier
Power supply
Built in
Power Supply
MAIN BOARD

2.
2.CV181H-X-40C CV181H-X-40C
Common problems solution
Common problems solution
—
—Power Chart
Power Chart
—
—Power Units Problem Solving
Power Units Problem Solving
—
—Display Units Problem Solving
Display Units Problem Solving
—
—Audio Units Problem Solving Audio Units Problem Solving
—
—Functional Units Problem Solving Functional Units Problem Solving

In stand-by condition,
Check TP3 have or not 5V?
Check main board TP5 have 3.3V ?
Normal boot
Check the availability of short-circuit
power supply and motherboard
Check power chip (U2) work?
Check power chip LDO (U1,U7,U8,U10)
work？
After power on,
Check point TP4 have 12V ，Test
point TP1 have 1.26V， Test point
TP12 have 3.3V , Test point TP9
have 2.5V, Test point TP8 have
1.8V ?
YN
OK
Check U1 Power
Supply Net
NY
Check external
power
NY
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
(
(Mainboard Mainboard can not boot.) can not boot.)

Flickering or
Black screen（Back light on）
Check the connection of Driver
Board Cable connect well
Change the LCD,
check if it is ok
Change driver
board cable
Y
N
Change
LCD
N
Y
Check the network output,
J6 cable socket
Works normal
Y
Check U9 (MST6M181VG)
Power supply and clock
circuit chip LVDS output
pin is short circuit,
or open-circuit ？
Change the circuit
N
Check LCD power
VCC-Panel is OK ?
J5 voltage is ok?
Q11 output voltage
is ok ?
Check the software
match able
Re-update the software
N
Picture.2 Display Unit
(black screen)

Black screen
Main board TP4
Have or not 12V？
Check the Inverter power supply
1pin of J7 or 4 pin of J3 output voltage is over 3.3V
Check power supply circuit
N
NY
Y
Maintenance power Inverter broke or
bad wire connection
Picture 3 Display Unit (black screen)

No sound
If Any audio signal input or
amplifier power supply normal
Check
External audio
equipment
Amplifier power
supply circuit
U3（TPA3110L）3/12
Pin have signal input
NY
YN
Check the Volume,
MUTE settings
Reset
J11 If any signal output
YN
Check
external
Speaker
Check amplifier
power supply circuit
Power supply
normal change U3
Check U9
audio input pin
has the signal output
NY
NY
Maintains U9
Peripheral
circuits，
change U9
Check U3 & U9
Connect part
network
Picture 4 Audio Unit (no sound)

Figure.5 Function Unit
(ATV broke down)
TV no searching
/no image
Check External RF
signal input
N
Check
external
RF
equipment
Y
Check the TP7 have 5V ,
or Check the TP11 have 3.3V ?
Check
power
supply
circuit of
U5 or U4
YN
Check Tuner No. 6,7pin of U13
Have I2C data
Check pull-up
voltage of I2C
network
N
Y
Check No.9,10 pin of U13 have IF signal
N
Y
Check external circuit
of U13 is OK?
N
Y
Repair
its outer
circuit
Check U13&
U9(MST6M181VG)
connect network Change
Tuner

TV no sound only picture
Check the sound of PC& AV
NY
See “NO SOUND”
repair guide Change
U9(MST6M181VG)
Picture 6 Function Unit （ATV with the
image but no sound)

PC
Image not
In the middle Color
cast Image
shakes No signal
Carry out
auto-adjust
operation
U9(MST6M181VG)
R.G.B input signal
works well
Reset the
system settings
YN
VS,HS signal
Stable and well
Check VS.HS
Circuit
OSD settings,
Or input mode
not correct,
Reset it
Check VS.HS
Circuit
YN
Check VGA
circuit
connection
Check
VGA circuit
connection
Check VGA
input circuit
Picture 7 Function Unit
(PC)