@dan56680 for Hisense the 2 blink code is commonly caused by a failed backlight. In cases where there is a feedback from the backlights, it will turn the voltages to the backlight off. if they have failed. This leaves the "flashlight" test somewhat useless.
I suggest to not just randomly changing of any boards. That can get expensive. Do some measurements and see what you have going on. We will need a close up of the power board, in particular of the connector where the main board connects to the power board. On that there should be a BKL_On pin that needs to be measured.
For the T-con board, do a quick check on the test points. Let us know what voltages you get. That is of course with the power on eetc. so you do want to be careful around the power board. It'll sting quite a bit of you touch any of those components with your bare hands :-)
@dan56680 for Hisense the 2 blink code is commonly caused by a failed backlight. In cases where there is a feedback from the backlights, it will turn the voltages to the backlight off. if they have failed. This leaves the "flashlight" test somewhat useless.
I suggest to not just randomly changing of any boards. That can get expensive. Do some measurements and see what you have going on. We will need a close up of the power board, in particular of the connector where the main board connects to the power board. On that there should be a BKL_On pin that needs to be measured.
For the T-con board, do a quick check on the test points. Let us know what voltages you get. That is of course with the power on eetc. so you do want to be careful around the power board. It'll sting quite a bit of you touch any of those components with your bare hands :-)