Touchscreen not working, is there a reason why?

You need to install the touchscreen driver from here: http://www.lcdwiki.com/4inch_HDMI_Display-C Scroll down to "How to use Raspbian/Ubuntu Mate/Kali/Retropie system"

When i first used the pi 4 screen, i connected the raspberry pie. raspberry pi 4 touchscreen flickered and didn't display. what should i do?

Make sure you read the instructions about the screen as it is not fully plug and play. It will flicker on and off a few times while being detected and there is a driver you will need to install to rotate the screen and set the resolution but it is all in the setup guide. If you did not get a setup guide, go to the website for the manufacturer and download it from there. Just be aware, this id a DIY device and setting this up may impact usability of other default monitors like it has for me.

Can I install drivers alone on my RasPi4b build without a complete new image - if so where is link?

Seller gave me instructions to install driver on an existing image within 2 hours of my email. Amazon rejects my reviews and replies if I try to post them. Be aware that there is no way to REMOVE the driver without installing a new image, also verified by seller who states they’re working on an uninstall.

I am looking at using this as a portable unit, with no power cord and battery use only. What battery would be recommended?

Miuzei raspberry pi 4-inch touchscreen power consumption is 5V 0.16A. It's recommended to use a lithium battery as power storage(NOTE: conversion between power storage and release )

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Miuzei Raspberry Pi 4 Touchscreen with Case Fan, 4 inch IPS Touch Screen LCD Display, 800x480 HDMI Monitor for RPI 4b 8gb/4gb/2gb with Touch Pen (Support Raspbian/Kali/Octopi/Ubuntu)- No Raspberry Pi

Miuzei Raspberry Pi 4 Touchscreen with Case Fan, 4 inch IPS Touch Screen LCD Display, 800x480 HDMI Monitor for RPI 4b 8gb/4gb/2gb with Touch Pen (Support Raspbian/Kali/Octopi/Ubuntu)- No Raspberry Pi

Product ID: 158541287

Details

Aspect Ratio
16:9
Brand
Miuzei
Resolution
800 x 480
Screen Size
4 inches
Screen Surface Description
Flat

🌀30mm cooling fan included

🎯60fps HDMI refresh rate

🖥️4-inch IPS 800x480 display

Description

🔥 Elevate your Raspberry Pi game with style and cool precision! 🕹️

SLEEK PROTECTIVE CASE - Precision-cut acrylic case with heatsinks combines style and passive cooling in one compact design.
INTEGRATED COOLING FAN - Keep your Pi 4 running cool and efficient with the built-in 30mm case fan.
SEAMLESS TOUCH CONTROL - Responsive touch support compatible with Raspbian, Kali, Ubuntu & Octopi for ultimate interactivity.
VIBRANT 4 INCH IPS DISPLAY - Crisp 800x480 resolution with wide viewing angles for flawless visuals anywhere.
PLUG PLAY HDMI COMPATIBILITY - Works as a standard HDMI monitor for any device—expand your setup effortlessly.

The Miuzei Raspberry Pi 4 Touchscreen is a 4-inch IPS LCD with 800x480 resolution and 60fps HDMI support, designed specifically for Raspberry Pi 4 models (2GB/4GB/8GB). It features a responsive touch interface compatible with popular OSes like Raspbian and Kali, an integrated 30mm cooling fan for optimal thermal management, and a sleek acrylic case with heatsinks. Perfect for portable projects, retro gaming consoles, or any Pi setup needing a compact, stylish display with reliable performance.

Specifications

ASIN	B07XBVF1C9
Additional Features	Touchscreen
Aspect Ratio	16:9
Best Sellers Rank	#3,750 in Computer Monitors #4,052 in Single Board Computers (Computers & Accessories)
Brand	Miuzei
Color	orange
Compatible Devices	Raspberry Pi 4B 8GB/4GB/2GB, Orange Pi, devices with HDMI input, and systems including Kali, Raspbian, Ubuntu, and Octopi
Connectivity Technology	HDMI
Contrast Ratio	2000:1
Customer Reviews	4.1 4.1 out of 5 stars (1,209)
Display Resolution Maximum	800*480 pixels
Display Technology	LCD
Display Type	LCD
Hardware Connectivity	HDMI, Micro-HDMI
Included Components	1 x 4-inch touch screen,1 x HDMI to HDMI converter,1 x Raspberry Pi 4 case,1 x silent cooling fan,1 x stylus,4 x radiators,1 x screwdriver
Manufacturer	Miuzei
Model Name	MC21-4
Model Number	raspberry pi 4 monitor
Mounting Type	Desk Mount
Native Resolution	800*480
Number of Component Outputs	2
Picture Quality Enhancement Technology	No Specific Technology
Processor Count	1
Refresh Rate	60 hertz
Resolution	800 x 480
Screen Finish	Flat
Screen Size	4 inches
Shape	Rectangular
Specific Uses For Product	Multimedia
Total Number of HDMI Ports	2
Total USB 2.0 Ports	1
Total Usb Ports	1
Viewing Angle	178 degrees
Voltage	5 volts
Warranty Description	Miuzei promises to provide LIFETIME WARRANTY service; Provide technical support at any time; Contact customer service for quick exchange or return; Any questions, contact [email protected] for seller support
Warranty Type	Lifetime Warranty

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