If the board is beyond a simple soldering fix, you can find original, tested replacement boards at several specialized retailers: Harry Electronics : Stocks used Sony T-Con Boards Great Bharat Spares : Sells verified KSZ80 Scaler Boards for LED/LCD repairs. Mercado Livre : Often lists Placa V-com units for various Sony models. Always match the PCB Number (KSZ80_0B_S4LV0.2)
The RMII interface reduces the pin count between the MAC and the PHY from 28 pins (MII) to just 6 pins: Ksz80 Ob S4lv0.2 Datasheet
The KSZ80_OB_S4LV0.2 acts as the critical bridge between the main T-CON (Timing Controller) board and the liquid crystal column drivers. Its core role is to manage line-by-line grayscale distribution, liquid crystal biasing, and sub-pixel signal switching. Specification / Value Part Classification LED/LCD TV Scaler Board / V-COM PCB Common TV Applications Sony KDL-40R485A, KDL-40R47A, KDL-40R355B Dimensions Approx. 53.5 cm x 2.00 cm Interface Input If the board is beyond a simple soldering
Isolate which side contains the structural short circuit by observing the copper traces traveling from the scalar PCB out to the left and right COF ribbons. Its core role is to manage line-by-line grayscale
Gate-Low voltage used to cleanly turn OFF the panel's TFT pixels Critical Fault Diagnosis: The "White Screen" Issue
KSZ8091MNX/RNB Data Sheet : Details for the version supporting Wake-on-LAN and Energy Efficient Ethernet (EEE).