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 - Isolation device for electrical signals

The Changhong plasma TV model PT42638NHDX displays a red dot on the right side of the screen when it's white or bright, and the image flickers. This issue is commonly found in Samsung panels and may be 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 the voltage from 205V to 209V. Then, adjust the VR5001 on the Y board counterclockwise to the bottom, then return it to its original position. Observe the screen; this problem should be resolved. If the issue persists, check the panel connections or consider replacing the display module.