My sagem tv trys to start but after a 30 secs it shuts off with the temp light on what the problem

I had same issue yesterday in the field. The sensor was bad in my case. After replacement of the Stack flu sensor my stack temp was only reading 80 degrees, a clear indication that the board needed to be replaced as well.
Replaced board and the heater fired fine and the stack temp reading was normal, 300 degrees.
To obtain a stack temp, after the heater fires hold down the pool or spa button until the temp appears in the display. It will time out after 10-15 seconds.

might be faulty temp sensor telling the brain the engine is overheating any codes? take it to oreily and get them to give you a printout of codes

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hi
shuting down after 30 sec sound to me like a bad lamp even if it lights up

Yes, replace the lamp.

Sounds like possible crank sensor failure,will work till warms up they have to cool,then will work again.Also monitor fuel preasure,fuel pumps can act this way too.

sounds like the blower is not cooling the heater coil fast enough this will cause it to shut down to prevent fire

This is bad. You need to either be under warranty on these big screen TVs or get the service manual. Especially since this is an off brand.

convergence ic bad