Hey everyone - I have a TCL 55S401 with these symptoms: powers on, has sound, and a black screen.
I tested with a flashlight and can see the TCL logo and setup screen. I did a factory reset and with a flashlight I can now see "select language."
Following instructions from Budm in a recent post for a TCL 55S405 without backlight, I did the following tests:
Power Supply to LED (pin label is under board)
Tested w/ multimeter at 200V and tv unplugged to plugged in to power on:
P10 LED1+ : 0
P9 LED2+ : 0>48~60>0.69
P8 NC
P7 LED2- : 0 > 0.01
P6 LED1- : 0 > 0.01
P5 LED4+: 0 > 0.01
P4 LED3+: 0 > 0.01
P3 NC
P2 LED3-: 0>22~25>0
P1 LED4-: 0
I also tested the PS to MB and will post later, but pretty much had 12V everywhere labeled 12V and 3.3V on P_Dim and 3.5V BL_ON
Another random symptom is that the TV turns on immediately after plugging into the socket instead of going straight to standby and waiting for me to push the power button. Not sure if that matters
Pics to follow:
I tested with a flashlight and can see the TCL logo and setup screen. I did a factory reset and with a flashlight I can now see "select language."
Following instructions from Budm in a recent post for a TCL 55S405 without backlight, I did the following tests:
Power Supply to LED (pin label is under board)
Tested w/ multimeter at 200V and tv unplugged to plugged in to power on:
P10 LED1+ : 0
P9 LED2+ : 0>48~60>0.69
P8 NC
P7 LED2- : 0 > 0.01
P6 LED1- : 0 > 0.01
P5 LED4+: 0 > 0.01
P4 LED3+: 0 > 0.01
P3 NC
P2 LED3-: 0>22~25>0
P1 LED4-: 0
I also tested the PS to MB and will post later, but pretty much had 12V everywhere labeled 12V and 3.3V on P_Dim and 3.5V BL_ON
Another random symptom is that the TV turns on immediately after plugging into the socket instead of going straight to standby and waiting for me to push the power button. Not sure if that matters
Pics to follow:
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