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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.
Order Code….. KT02 POWER SUPPLY REPAIR KIT BUSH MAXIM 1157 1154 Medion Goodmans (Standard) 04TA069I 05TA71B 05TA071C A standard power supply repair kit for faults attributed to the standby +5v rail. BUSH IDLCD27TV006. MAXIM 1154, 1157. MEDION MD30112. GOODMANS IDLCD27TV006. The numbers off the boards will read: 04TA069I 26” 27” 30” 32” & 05TA71B, 05TA071C. LCD TV POWER SUPPLY PROFILO-TELRA. Please check the primary of TR20 before fitting the kit. Primary windings should read approx 2.700mH / 4.00 Ohm. We recommend all kits are fitted by qualified engineers We accept no responsibility for loss, injury or damage caused by your use of this kit as a successful repair depends on your own skill and fault finding ability.
Diagrams i am sure as you know are not always easy to come by, at least for free. I see that there are available boards online and a company that will rebuild this model of power board for you in UK. ohmsupplies.co.uk is where it is at. looks like $80