World vision t34 DIY repair

It is necessary to explain it as for a beginner, those who understand will do everything themselves.

Good afternoon. I need your advice. The t54 prefix was plugged into the 5 volt place at 12 volts, after which the LED does not light up. What could have burned out. Thank you. along the circuit at the beginning there is a 15cfb microcircuit after there is a throttle on which there is no power. I think that this very microcircuit burned out.

Hello. At work, the guards drove this device. They say it worked, then the signal disappeared. Turned off, turned on and nothing. The green LED is on. They gave it to me, they say, look. Brought home, disassembled, turned on. The green LED is on, the processor on the radiator is not heating, the RAM is heating, 40 degrees. I measured the voltage, everything is normal. I connected an adapter to the UART, started the terminal. When connected to the network, the terminal writes: BOOTSPI and that's it. Not there and not syudy. Okay, I downloaded the firmware, flashed it through MiniPro, soldered it, the same bullshit. Although earlier about 2 months ago, they already brought it to me. Didn't work either. When I took it apart, I found several cockroaches, a big pile of cockroach shit. I washed it with hot water and liquid soap, dried it, connected it to the terminal, at start-up he issued such a footcloth on the port, and now there is only one inscription. Can you tell me where to dig further, I have never dug into these Chinese receivers. I would be glad if you answer.

Hello!
Receiver BBK SMP123HDT2. The problem is this: when you turn on the receiver, the TV works for 3-5 seconds. there is an image and sound, then everything disappears, the receiver turns itself off, goes into standby mode, the red light is on. When you turn it on again, the situation repeats. Sometimes, when turned off, the screen field is green. If you disconnect the antenna cable, turn on the receiver, insert a flash drive, then only the media player works in normal mode. Tell me what could be the problem? Maybe you have already encountered similar malfunctions?

Video (click to play).

professor prefix Oriel 303-image good sound fonit and changes when the picture changes. When you turn off the video output, the sound is good with no background. Tell me the reason

And if possible, a question. The same T59M prefix, after starting the channel search, passes 25% and turns off. Reboots and re-enables the basic settings menu. The CPU heatsink temperature is about 80 degrees and the whole circuit consumes 850 mA. current.

If not difficult, could you help me
There is a BBK SMP123HDT2 prefix, when connected to the network, green and then red lights up, there is nothing on the TV, respectively, I checked the voltage on the stabilizers, all voltages were checked except for 1.8 volts on the APS2408 stabilizer, I sealed it off, turned it on without it, the green is on, the red does not light up anymore, I thought everything is fine, I soldered the wiring to the choke, from the LBP I applied 1.8 volts to it, turned it on, and again the same picture, green then red lights up, nk tell me what could be the reason. Thank you in advance, best regards, Alexey