I am sorry to hear that you have this problem. TCL55P3 is a 55-inch TV model introduced by TCL company. Pink stripes may be caused by some display problems or signal interference. There may be many reasons for this problem, such as screen failure, video input problems and so on. In order to judge and solve the problem more accurately, I suggest you try the following steps:

1. Check the connection: Make sure all video signal lines (such as HDMI cable and AV cable) are connected to the TV correctly, and try to change different cables for testing.

2. Adjust the settings: enter the TV settings menu, check the screen display settings, try to adjust the brightness, contrast and color settings, and clear any possible image effects or filters.

3. Restart the TV: Try to restart the TV. Sometimes there will be some temporary problems when TV is used for a long time. You can try to clear some faults by restarting.

4. Customer service support: If the above methods fail to solve the problem, I suggest you contact TCL customer service or the nearest after-sales service center to describe the specific problem phenomenon to them, and they will give more accurate solutions or provide maintenance services according to your description and situation.

If you have tried the above methods, but the problem still exists, you may need to solve the problem through further detection and repair. At the same time, you can also refer to the user manual of TCL 55P3 to see if there are any special instructions or solutions for this problem. I hope these are helpful to you!