Akai LEA-19V07P Manual de usuario

LEA-19V07P

LEA-22V07P

LEA-24V07P

Important Safety Instructions ---------------------------------------------------------------- 3

Basic Trouble Shooting ------------------------------------------------------------------------- 4

Main Board Trouble Shooting ----------------------------------------------------------------- 5

Main Board Circuit Diagram -------------------------------------------------------------------14

Panel Interface Pin Connection --------------------------------------------------------------25

General Trouble Shooting ----------------------------------------------------------------------33

Software Upgrading Methods -----------------------------------------------------------------

Important Safety Instructions

Observe all warnings and cautions

●All warning and cautions on the unit and in the User Manual must be observed closely.

Servicing

●Non-qualified service personnel shall not open the cabinet for repairing.

Be sure to unplug the power cord from the outlet before cleaning and servicing.

Handing and Cleaning the Screen

●Do not push on or scratch with hard objects. Or throw anything at the screen. The

screen may be damaged.

●To remove dust from the screen surface, wipe gently with a clean, soft and cotton-free

dry cloth.

●Do not use any type of abrasive pad, alkaline/acid cleaner or strong solvent such as

alcohol, thinner or benzene etc, as the surface maybe impaired.

Replacement Parts

●Make sure that the replacement parts are specified by the manufacturer, or those parts

with the same characteristics and performance as the original parts. Use of unauthorized

parts can result in fire, electrical shock or other danger.

●Upon completion of service or repair work, request the service technician to perform

safety checks to ensure that the unit is in proper operating condition.

Basic Trouble Shooting

Problem: Do not power on and no red indicator light.

●Please check the output voltage of AC adaptor, the proper output should be DC12V.

●Please check the fuse on the Main Board if broken.

Problem: Do not power on, red indicator light at stand-by mode.

●Please check whether the power supply has somewhere short circuit to ground or not?

●The EEPROM or Flash memory lose the software, upgrade again please.

Problem: Power on the unit, no display on the screen, but sound is

ok.

●Please check whether the backlight of LCD/LED panel is lighted or not.

●If no backlight, check the connection is reliable? And check whether LED driver board is ok or

not? If not, please replace the LED driver board.

●If the backlight works normal, but no display or no picture on the screen, please check whether

the power supply to the panel (+5V) is right or not? If not, need to check whether the switch

transistor on the Main board is broken or not? Refer to Main Board Trouble Shooting and Circuit

Diagram.

Problem: The remote controller doesn’t work.

●Please check whether the connector from the Main board to Key board is reliable or not? Refer

to Main Board Circuit Diagram.

Problem: No sound.

●Refer to Main Board Trouble Shooting: Audio Trouble.

Problem: Crackly noise

●When turn volume high up it vibrate the casing and make crackly noise, please check and add

more cotton flannels on the cabinet. And please check whether the speaker is damaged. If yes,

please replace a new speaker.

Problem: TV can not search any channels.

●Refer to Main Board Trouble Shooting: Function Trouble.

Main Board Trouble Shooting

Check E3 for 12V output ?

1、Power Supply Trouble

F1 damage or power supply Check E9 for 5V output

L13/10μHis

dama

ed or false

Check if U1,U2 for 3.3V

and U3 for 2.5V output?

welding

Check the circuit

Check U4 for 1 2V

’

s normal but

of U1,U2 ,U3

Check

for

output

It’s normal but the

voltage is high

It s

normal

but

the voltage is

Low

Check if pin

N4f U7/

U4/ AIC2857GR8TR damage L2/10μH is damaged or

false welding

U7/

RT8269GSP is

false welding

or U7 is

damaged

E9 is

damaged or

the loader is

in short

circuit

It’s normal but

the voltage is

high

It’s normal but

the voltage is

Low

Ch k if i N 4 f U4/

E6 i d d th

U4/

AIC2857GR8TR is false welding

or U4 is damaged

amage

loader is in short

circuit

Exceptional screen

2、Display Trouble（exceptional screen）

Check if the cable is correct

and connected tightly

and

connected

tightly

Y N

Check if the LCD

panel is OK

Check if the output circuit from

U12 to the jack to panel are normal

Change the cable

for panel

Change LCD Check the circuit of U12 Change or repair the damage

components in this part

White screen

3、Display Trouble （white screen）

Check if the voltage of panel power

supply is normal(depend on panel)

supply

normal(depend

panel)

Is there voltage on grid of

Q8/WPM3407 can changed

(12～0V or 5V~0)

Is there output signal

from U12

NY YN

CN4 is ill-connected

(is there voltage for panel)

or Q8 is damaged

Check if the circuit of Q9 normal? Change the LCD panel

or the cable to panel

U12 is illness

Check if the I/O of U12 is damaged

(the 132th pin) Q9 is damaged

4、Display Trouble（black screen）

Black screen

Check if the voltage on

CN13/BLON is 5V

Check if the power supply

for inverter is normal

Check the control circuit from

BLON to U12 or U12 is damaged

Repair the power supply The inverter is damaged

5、Audio Trouble（No sound)

No Sound

Check if have audio signal

input

Check the set of volume, Mute is normal

Check signal output on pin no. 4 & 6 of U13

Is normal

Check power supply (>11V)on pin no. 7 of

U13/1517P

normal

Check the voltage (>9.2V) on pin no.8

Of U13

Check external

Check the signal output on pin 64 &65 of U12

Does it has signal input on U12 Check the circuit from U12 to U13

Check

external

Audio equipment

Repair the U13 power supply

Rest it Check external

speaker

Does Q26 has damage

And repair D60 or R257

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