Orion LED2648 User manual

ORION
SERVICE MANUAL
LED26/3248

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

CV182H-G-40 CV182H-G-40 CV182H-G-40 CV182H-G-40 CV182H-G-40 CV182H-G-40 CV182H-G-40 CV182H-G-40
Common problems solution Common problems solution Common problems solution Common problems solution Common problems solution Common problems solution Common problems solution Common problems solution
——Power Units Problem Solving Power Units Problem Solving Power Units Problem Solving Power Units Problem Solving Power Units Problem Solving Power Units Problem Solving Power Units Problem Solving Power Units Problem Solving
——Display Units Problem Solving Display Units Problem Solving Display Units Problem Solving Display Units Problem Solving Display Units Problem Solving Display Units Problem Solving Display Units Problem Solving Display Units Problem Solving
——Audio Units Problem Solving Audio Units Problem Solving Audio Units Problem Solving Audio Units Problem Solving Audio Units Problem Solving Audio Units Problem Solving Audio Units Problem Solving Audio Units Problem Solving
——Functional Units Problem Solving Functional Units Problem Solving Functional Units Problem Solving Functional Units Problem Solving Functional Units Problem Solving Functional Units Problem Solving Functional Units Problem Solving Functional Units Problem Solving
2.

In stand-by condition,
Check TP3 have or not 5V?
Check main board TP9 have 3.3V ?
Normal boot
Check the availability of short-circuit
power supply and motherboard
Check power chip (U2) work?
Check power chip LDO (U3,U7)
work
？
After power on,
Check point TP1 have 12V
，
Test
point TP5 have 1.26V, Test point
TP2 have 1.8V ? Test point TP7
have 2.5V ?
YN
OK
Check U12 Power
Supply Net
N Y
Check external
power
N
Y
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
Picture 1; Power Units Problem Solving
(
(
(
((
(
(
(Mainboard
Mainboard
Mainboard
Mainboard Mainboard
Mainboard
Mainboard
Mainboard can not boot.)
can not boot.)
can not boot.)
can not boot.) can not boot.)
can not boot.)
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,
J3 cable socket
Works normal
Y
Check U11 (MST6M182VG)
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 ?
J2 voltage is ok?
Q3 output voltage is
ok ?
Check the software
match able
Re-update the software
N
Picture.2 Display Unit
Picture.2 Display Unit
Picture.2 Display Unit
Picture.2 Display Unit
(black screen)
(black screen)
(black screen)
(black screen)

Black screen
Main board TP1
Have or not 12V
？
Check the Inverter power supply
4 pin of J7 output voltage is over 3.3V
Check power supply circuit
N
N Y
Y
Maintenance power
Inverter broke or
bad wire connection
Picture 3 Display Unit (black screen)
Picture 3 Display Unit (black screen)
Picture 3 Display Unit (black screen)
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
U1
（
TPA3110
）
3/12
Pin have signal input
N
Y
YN
Check the Volume,
MUTE settings
Reset
con2 If any signal output
Y
N
Check
external
Speaker
Check amplifier
power supply circuit
Power supply
normal change U1
Check U11
audio input pin
has the signal output
NY
N
Y
Maintains
U11Periphera
l circuits
，
Check U1 & U11
Connect part
network
Picture 4 Audio Unit (no sound)
Picture 4 Audio Unit (no sound)
Picture 4 Audio Unit (no sound)
Picture 4 Audio Unit (no sound)

Figure.5 Function Unit
Figure.5 Function Unit
Figure.5 Function Unit
Figure.5 Function Unit
(ATV broke down)
(ATV broke down)
(ATV broke down)
(ATV broke down)TV no searching
/no image
Check External RF
signal input
N
Check
external
RF
equipment
Y
Check the TP8 have 5V ?
Check
power
supply
circuit of
U9
Y
N
Check Tuner No. 6,7pin of U6
Have I2C data
Check pull-up
voltage of I2C
network
NY
Check No.9,10 pin of U6 have IF signal
NY
Check external circuit
of U6 is OK?
NY
Repair
its outer
circuit
Check U6&
U11(MST6M182V
G) connect network
Change
Tuner

TV no sound only picture
Check the sound of PC& AV
N
Y
See “ NO SOUND ”
repair guide
Change
U11(MST6M182VG)
Picture 6 Function Unit
Picture 6 Function Unit
Picture 6 Function Unit
Picture 6 Function Unit
（
ATV with the
ATV with the
ATV with the
ATV with the
image but no sound)
image but no sound)
image but no sound)
image but no sound)

PC
Image not
In the middle
Color
cast
Image
shakes
No signal
Carry out
auto-adjust
operation
U11(MST6M182VG)
R.G.B input signal
works well
Reset the
system settings
Y N
VS,HS signal
Stable and well
Check VS.HS
Circuit
OSD settings,
Or input mode
not correct,
Reset it
Check VS.HS
Circuit
Y N
Check VGA
circuit
connection
Check
VGA circuit
connection
Check VGA
input circuit
Picture
Picture
Picture
Picture 7
7
7
7 Function Unit
Function Unit
Function Unit
Function Unit
(PC)
(PC)
(PC)
(PC)