TCL 43A8000 LCD TV – How to Upgrade the USB, USB key update, Menu upgrade, SMPS board schematic, troubleshooting

 

USB Upgrade
1. Rename the upgrade file V8-T841T01-LF1V021.img into install.img
2. Put bin file to the root of the Udisk, and plug in TV set through USB.
3. AC disconnect.
4. AC connect and long press OK button on panel, wait 10 Seconds and you see upgrade process is shown on the screen.

MENU Upgrade
1. Rename the upgrade file V8-T841T01-LF1V021.img into install.img
2. Put bin file to the root of the Udisk, and plug in TV set through USB.
3. Go to factory menu
a) Press settings button under HDMI source
b) Picture & Display->Picture Adjustment-> Advanced Settings->Brightness->Contrast
c) press “1950” on Contrast
d) other->USB Update
4. Press Main update, it will power off and upgrade in 10 Seconds you will see the upgrade process shown on the screen.

USB key Update
1. Put the Key file as below to the USB root directory, and connect to TV, it will update the TV Key.

2. After update the keys, it will display “OK” on screen
3. Done.

SMPS (Power supply board) schematic

Trouble shooting

No power LED, RC or Key cannot turn on TV. Power LED no light - no change.

Back light is OK, sound is OK, but no picture.

Power LED logic OK, sound OK, but no picture (Different from No Display).

One or All signal source without sound.

One or several source no function.

Abnormal Display.  OSD NG or picture NG.

No tuning channels.  DTV or ATV no Channels.

P mode on and burning mode