CVTE TP.MS3663S.PB818 Trouble Shooting
TP.MS3663S.PB818
Tr ouble Shooting
◎ Power troubleshooting
◎ Display troubleshooting
◎ Audio troubleshooting
◎ Function troubleshooting
◎ Power board troubleshooting
1. The power supply circuit diagram
AC
input
EMI
filter
Rectifie
AC/DC
Power convertor
Output
filter
Output
filter
Feed
back
19V/24V/
32V
output
12V
output
power amplifier、
The main IC、
Screen voltage
and so on
19V/24V/
32V
output
LED driver
PWM_REF
LED
2. Power Supply Trouble(AC-DC)
Non output, IR indicator light slake
Y
N
Check if 12V、19V（24V/
32V） output normal
N
Check if FB 1 Open
N
Check EMI open or L N short
N
Check if EB1 voltage
about √2Vac
Y
Check if UB101PIN5
voltage is about 15V
YY
N
Check the power
components
damage or not
Y
Check if RB101,
RB102 open
Change short
components
Y
Change damaged
components
Change damage
resistors
Go to
check
Main
board
function
Check the rectifier
Y
Check if output short
N
Change
UB101
3. Power Board Diagram
19V/24V/32V
input
LED driver
PWM_REF
LED
4. Power supply for LED drive
IR indicator light
up but backlight slake
Check if LED
output
short/open
Y
Y
Y
Check if LED output cable
is connect correction
N
Check PWM_REF Control signal
Y
check is part of
the brightness is
in dim status
check is all of
the brightness is
in dim status
N
Check if UB801 PIN 1
voltage is about 12V
Y
Check QB801/DB801
damage or not
N
Y
Increase
brightness/check
if Sampling
resistor is right
N
Correct
the LED
cable
Remove
short/open
status
Y
Change
QB801/DB801
Change UB801
Check
Main
board
function
5. Power Supply Trouble
Check Pin2 of CNB2 for 12V
N
Check if the power
board is OK?
N
Repair the power board.
Repair the abnormal circuit :
1.5V_STB—check UD1
2. 3V3_STB—check UL1
3.1.15V_VDDC–- check UD2
and peripheral components
N
Y
Check power on the TV board.
Y
Check UD1 for 5V_STB , UL1 for
3V3_STB and UD2 for 1.15V_VDDC
N
Power on , check CM2 for
5V_M,UL2 for 1.5V_DDR
Y
Y
Repair the abnormal circuit :
1. 5V_M—check power supply ,and
QM1 circuit
2. 1V5_DDR–- check UL2
OK
6. Display Trouble（blurred screen）
Check if the cable is correct
and connected tightly
blurred screen
Change the cable
for panel
Change panel
Repair this circuit
N
Y
Check if the panel is OK
N
Y
Check if the output circuit from
U1(MSD3663)
to the jack is normal
N
Y
Software error or
U1(MSD3663) damage
7. Display Trouble （white screen）
Check if the voltage of panel power
supply is normal(depend on panel)
White screen
Check the circuit of QM3
Change U1(MSD3663)
N
Y
Check output signal
from U1(MSD3663)
N
Y
Change the panel
or the cable to panel
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