Hansol LCD SIP 40B is an industrial LCD monitor board that interfaces with the display panel and drives the back‑light via a DC/DC converter. Common failure modes include capacitor or diode degradation on the power rails, burnt or failed controller ICs (e.g., TCON), and back‑light LED driver faults; these often manifest as dimming, flicker, or complete loss of image. Begin diagnostics by verifying 12 V/5 V rail continuity with a multimeter, inspecting for bulging capacitors on the power section, and checking the back‑light current against spec. If those checks pass, examine the TCON and display driver ICs for visible damage and test their output signals with an oscilloscope before proceeding to component replacement.[oss-gpt-20b]