Here's a rewritten and improved version of the original content in English, with added details to make it more natural and engaging, while keeping the core information intact. The final text exceeds 500 characters:
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I want to share my experience with all members. Yesterday, I bought a TCL L40F3800A advertising machine. It only showed ads and TV through the TV interface—everything else was locked! The user had to enter a password to access other functions like the AV input. I tried searching online for a solution, but no one could help. I even downloaded similar firmware, but couldn't upgrade it. (Turns out you don’t need to install any program for that.)
Finally, I had no choice but to pay 30 yuan to get the password. (The so-called password is just a code to access the hidden menu and change settings.) Now that I’ve figured it out, I hope others won’t waste money on passwords if they can do it themselves.
Here’s how I did it:
1. Use the original remote control, turn on the TV, press the Menu button, go to Settings, then Display, and finally Advanced Settings.
2. Navigate to Contrast, and quickly type in the password: **9705**.
3. The Bus Adjustment option will appear on the screen. Use the remote’s up/down buttons to scroll down and select the second-to-last item: **Advert Mode**, change it from **ON** to **OFF**.
4. Turn off the TV, restart it, press the Home button, and the hidden input options will now be visible.
5. Choose the TV option, go to the AV interface, and hit OK. Once the signal cable is connected, the TV finally works!
If you still have trouble, check the images below to follow along step by step.
I hope this helps someone avoid wasting time and money. Let me know if you need further assistance!
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