TE.MS3663S.
EA67
Trouble Shooting
—Power supply
—Display
—Audio
—Function
TV Author : LiuXingpeng Checked By
POWER Author : Chaoxinku/Liaoshengfeng Checked By ：
1. Power Board Diagram
12V LED driver
LED
input
PWM_REF
2.Power supply for LED drive
IR indicator light
up but backlight slake
Y Check if LED output cable
is connect correction
N
Check PWM_REF N
Control signal
Y
Y Increase
Check if LED Y check is part of check is all of brightness/check
output the brightness is the brightness is if Sampling
short/open in dim status in dim status resistor is right
N
Check if UB801 PIN 3
voltage is about 12V
Y
Y
Check the built-in MOS
N
Check DB801 of UB101 damage
damage or not or not(Check PIN4 to
PIN6 short or not)
Y
Remove Y
Correct Check
short/open Main
the LED
status Change board
cable Change UB801
DB801 function
3. Power Supply Trouble
Check Pin2 of CNB2 for 12V
N Y
Check if the power
Check power on the TV board.
board is OK?
N Y
Repair the power board. Check UD1 for 5V_STB , UL3 for
3V3_STB and UD2 for +1.1V_VDDC
N Y
Repair the abnormal circuit :
1.5V_STB—check UL5 Power on , check UD3 Or QM1 for
2. 3V3_STB—check UL3 5V_M,UL2 for 1.5V_DDR
3.+1.1V_VDDC–- check UD2
and peripheral components
N Y
Repair the abnormal circuit :
1. 5V_M—check power supply ,and
OK
UD3 Or QM1 circuit
2. 1V5_DDR–- check UL5
4. Display Trouble（blurred screen）
blurred screen
Check if the cable is correct
and connected tightly
N Y
Change the cable
Check if the panel is OK
for panel
N
Y
Check if the output circuit from
Change panel U1(MS3663)
to the jack is normal
N
Y
Software error or
Repair this circuit
U1(MS3663) damage
5. Display Trouble （white screen）
White screen
Check if the voltage of panel power
supply is normal(depend on panel)
N Y
Check the circuit of QM3 Check output signal
from U1(MS3663)
N Y
Change the panel
Change U1(MS3663)
or the cable to panel
6. Display Trouble（black screen）
Black screen
Check if BL_ON state is normal
N Y
Check if the control circuit Check if the control circuit
between BL_ON and between ADJ and
BL_EN is normal ? PWM/ADJ is normal ?
Y N Y
N
Check if the power supply
Repair the circuit Change U1(MS3663) Repair the power supply for inverter is normal?
Check the inverter board
7. Audio Trouble（No sound)
No sound
Check the AMP power
N Y
Check if PIN4/13 of the AMP IC
Check the power supply circuit
voltage is normal
N
Y
Check the control circuit Check the input signal
N
Y
Check the circuit from U1
Check the output signal
to AMP
N
Y
Check the circuit between output jack
Check the circuit from AMP to the jack
and AMP chip, Change AMP chip
8. Function Trouble（TV video）
TV can’t search any
channel/no picture
Check input RF signal
N Y
Check the RF source Check tuner power
N
Y
Check power supply circuit Check if IIC work
N Y
Check IIC circuit Check IFP/IFN output signal
Y
N
Check tuner and Check the circuit from
peripheral components tuner to U1(MS3663)
9. Function Trouble（PC）
PC mode
Picture is not Missing color, Picture
No signal
in center deflection color dithering
Check if the R.G.B
Check if the signal of
input signal of U1
V-sync,H-sync is OK
is normal
Y N
Y N
Do “reset” process
Do “auto adjust” Do “reset” process Check the circuit of on the menu or Check the circuit Check the circuit
process on the menu R.G.B input the input mode of VS.HS of VS.HS
can’t be supported
10. Function Trouble（HDMI、YPbPr、CVBS）
HDMI , YPbPr , CVBS
Check the signal at the jack
N Y
Check the signal on the
Check the external source
Corresponding of U1
N Y
Check the circuit from jack to Change U1(MS3663)
U1(MS3663)
