PDF guide on COF failure symptoms, filed under schematics, 848 KB. COF stands for chip-on-film, the source driver ICs bonded on flexible tabs between an LCD panel and its source PCB. Such material typically shows on-screen symptoms like vertical lines, bands, half-screen faults or missing colours and links them to a failed COF. Use it to decide whether a fault lies in the panel drive section rather than the T-con or main board, before ordering parts or attempting tab rebonding.
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