TV not displaying the video in AV, component, and HDMI modes, back light is ok, audio is ok. Screen is found as dark as in video mute condition means a blank screen. But same time MENU and Other TV display all are showing as normal. Also USB video is can be watched withouth issue. PCB Main part code is BN94-05849E, and model is UA40EH5000RXXT, Is there any possibility to repair the set without replacing Mother board. Can I get the service menu code of this model
Hi Hari Krishnan,
Recently I repaired a Videocon 32" LCD for "no signal" in AV mode. AV input in the service menu got off by itself. Corrected it and the problem was solved. There may be similar problem in your case too, if there is no component damage or failure in the main board. Unfortunately I do not have service code for your set. Good luck.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.
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