Changhong plasma TV PT42638NHDX irregular flower screen (with red dot) common disease repair - android - Phones Developers

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor, AVX 22

Electronic scale crystal oscillator, 3.2*2.5mm 3225, 16MHz (16.000MHZ), 12PF, 10PPM, 20PPM, 30PPM

MOS power IC full range

Photocoupler, optocoupler for signal isolation

The Changhong plasma TV model PT42638NHDX experiences a red dot appearing on the right side of the screen when displaying white or bright images, and it may flicker. This type of issue is commonly seen in Samsung panels and is often caused by incorrect screen parameters. During maintenance, you can adjust the VS power potentiometer. Locate VRS801 on the upper right corner of the power board and increase its voltage from 205V to 209V. Then, adjust the VR5001 on the Y board by turning it counterclockwise to the lowest point and then back to its original position. Observe the screen after this adjustment—this red dot phenomenon should disappear. It’s important to proceed carefully during these adjustments to avoid damaging the components. Always ensure the TV is unplugged before making any internal changes. If the problem persists, consider checking other components such as the mainboard or the display panel itself.