Akai LEA-19V07P Manuel utilisateur
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 -----------------------------------------------------------------
34
2
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.
3
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.
4
Main Board Trouble Shooting
5
Check E3 for 12V output ?
Y
N
1、Power Supply Trouble
F1 damage or power supply Check E9 for 5V output
Y
N
L13/10μHis
dama
g
ed or false
Check if U1,U2 for 3.3V
and U3 for 2.5V output?
N
Y
g
welding
Check the circuit
Check U4 for 1 2V
Y
N
It
’
s normal but
of U1,U2 ,U3
Check
U4
for
1
.
2V
output
YN
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
N
o.
4
f
or
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
Ch
ec
k
if
p
i
n
N
o.
4
f
or
U4/
AIC2857GR8TR is false welding
or U4 is damaged
E6
i
s
d
amage
d
or
th
e
loader is in short
circuit
6
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
NY
Check if the output circuit from
U12 to the jack to panel are normal
YN
Change the cable
for panel
Change LCD Check the circuit of U12 Change or repair the damage
components in this part
7
White screen
3、Display Trouble （white screen）
Check if the voltage of panel power
supply is normal(depend on panel)
supply
is
normal(depend
on
panel)
NY
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
Y
N
Check if the I/O of U12 is damaged
(the 132th pin) Q9 is damaged
Y
N
8
4、Display Trouble（black screen）
Black screen
Check if the voltage on
CN13/BLON is 5V
NY
Check if the power supply
for inverter is normal
YN
Check the control circuit from
BLON to U12 or U12 is damaged
Repair the power supply The inverter is damaged
9
5、Audio Trouble（No sound)
No Sound
Check if have audio signal
input
NY
Y
N
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
Is
normal
YN
Check the voltage (>9.2V) on pin no.8
Of U13
N
Y
YN
Check external
Check the signal output on pin 64 &65 of U12
YN
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
10
Ce manuel convient aux modèles suivants
2
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