Orion LCD2028D Manual de usuario

ORION

SERVICE MANUAL

LCD2028D

1．Complete Unit Circuit diagram

POWER

SWITCH

LCD P

NEL

POWER BOARD

18V

REMOTE BOARD

CN2

CN4

VIDEO

CN22

UDIO

CN11

SPEAKER

OFF

ADJ

BOARD

MAIN BOARD

DVD

CN7

CN1

CN2

DVD

DECODE BOARD

CN4

DVD

BOARD

2． Main Board

Power supply troubleshooting

Display troubleshooting

Audio troubleshooting

Functionare troubleshooting

1/3

with 12

？

Check fuse FI or external power E33/470μF/16V if Voltage is5 V

Fuse burnt when power on？

Check if can power on

（via button or R/C）

Check power output

(U16,U18,U19)

OK Check F1 descending

Power supply network

Check if the second

Pin of U1 have 150

KHZ on-off signal

LCD burnt out,

short-circuit

U1/

MP1410ES-LF

D17/IN5822 has problem

L9/47Μh circle inductance

or solder problem

No damage but voltage

is higher

U1/

MP1410ES-LF

the 4

had Solder problem or U1

damaged

Check U21:

power supply

reset,vibration

works normally

No damage but

voltage is lower

E33: power leakage or short circuit of

descendin

ower

1) Power problem

)

Dis

roblem（dis

distortion/Mosaic）

osa

Check if the cable connected to panel

is right and works normally

Check if

panel is ok?

Check if the out

ut of U5

cable socket is ok?

Change

panel

Check the power supply

And timer circuit of U5

Change the cable

which drives the

panel

Replace or repair this

part of circuit

)

、

roblem

（white screen）

White screen

Check if Voltage for panel is

ok?( depend on the selected panel

)

Check G pole of Q24/AO34

01 has

the change of 3.3-0V or 5-0V

Y N YN

CN8 connecting defective

(provide have panel driving

voltage) or Q24 damaged

Check the circuit from the 98

pin of U21 to Q24

Panel defective or

drive cable for pane

has probleml

U5 defective or

power supply

abnormal

Check if U5 has signal output?

)

、

roblem

（black screen）

Black screen

Is there 5V backlight voltage

(

BLON

)

at CN19?

Y N

Check if inverter power supply

works nomally?

Replace

Inverter

Check the circuit of Q26 or I/O

port of U21 (99

pin)

Check the

external power

supply

)

.Audio

roblem

（No sound）

o soun

Check if there is

Audio input

Is volume, MUTE

settings correct?

Is there signal

output at CN11?

Check if voltage at the 7

pin of

U3/TPA1517NE is hi

her than 11

Check if voltage at the 8

pin of U3 is higher or

equal

9.2V

Check if the 1st and 9th pin

at U3 have input signal

Check if the 4TH and 6th pin

at U3 have output signal

Check if the 60th and 61th

have

output

signal

Check

externa

l audio

device

eset

Check

external

speaker

Check the circuit

from the 104th

&105th pin of U21 to

the 8th pin of U3

Check is there audio imput

signal at U21:

PC: the 53rd & 54th pin

AV: the 49th& 50th pin

Scart:the 56th & 57th pin Check the

power

supply

circuit of

damaged

Check

U21:if

voltage

8V on 45th

pin is ok

or U21

damaged

Check

circuit

between

Audio

input jac

and U21

Y N

Check

output

between U3

and CN23

Check

the circuit

from the

60th &61th

pin of U21

to the 1st

nd 9th

pin of U3

)

Functionare （TV

Video）

no channel scan/no video

Check if RF imput signal is ok?

Check voltage at the 7

f T1/TEDE9-2B4A is 5V?

Y N

Check

external

device

Check th

circuit betwee

& 25

of U21 and 11

of T1

ower su

U21

damaged

Check/re

air

the

peripheral

circuit

Check I2C

circuit( connec

ted to the 108

& 109

pin of

U21 TDA15021H

Repair

R267/0

Check the

step-up

circuit of

the power

supply pin

Check the

power

supply

circuit of

the pin

Check voltage at the 9

pin o

T1 is 33V?

Check voltage at the 3

pin o

f T1 is 0V?

Check: is there I2C data at the 4

pin o

f T1?

Check is there signal at the 11

of T1

Check voltage at the 1

pin o

T1 is 1.5-4.1V?

)

.Functionare（TV

Audio）

no sound，but have

video

Check if audio is ok under PC/AV

modes

Check is there signal at the 2n

pin of

SAW2/AF389A2D

Refer to

“

No sound

”

checking process

1. SAW2

damaged

2. U21:

the

,30

pin have solder

problem

3. U21

ower su

problem

4. U21

damaged

Check if the

circuit between

the 2

pin of

SAW2

and

C133/0.01

C133 is damaged

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