TCL L32F3300 - Troubleshooting: Power On Failures; No Power On Diagnosis Flowchart

+3V3_STB(P100
Pin7) is OK?
Can not
Power On
Check AC input and
PSU
P100
PIN1,2,4=24V is
OK?(+24V)
ON/OFF
POWER (P100
PIN 10)is >2V?
N
Check IR net
Check U100 and
other components
around U100
1ǃHave no anything, No backlight/No Video/No Audio etc...
Y
Y
Y
1ǃCheck the RS232(P402) port information?
2ǃCheck I2C is Working normally?
3ǃCheck sys_clk(X500)=27MHz?
4ǃCheck software normally?
5ǃCheck U500 connect normally?
Remote Power On
12V
POWER(L114,L1
15,12V) IS OK?
Y
N
CHECK STB LEVER
IF CHANGE(R156) ?
N
Y
Check PSU
N
Y
Check 5V(U106+Q100 OUT,L102)=5V?
Check VCCK(U107 OUT,L100)=1.1V?
Check AVDD1V2(U105 PIN2)=1.2V?
Check DVDD3V3(U104 PIN2)=3.3V?
Check AVDD3V3(U109 PIN 2)=3.3V?
Check DDRV(U111 PIN 2)=1.5V
Check DC/DC DETECT section
Y
N
N
Check IR net is
OK?
N
Y