Why does the satellite receiver not turn on?
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7 ماه پیش
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What are the 5 common
What are the 5 common faults in receivers?
Satellite receivers are located in all places. These receivers will have problems after some time. Most of the failures of receivers are related to the switching power supply. The switching power supply of these receivers often has several outputs. Failure of the capacitors of the output section and the 400 volt storage capacitor causes the device to not work properly. Either it doesn't turn on or it stays on the red light. In this case, we do not have voltage. Either the voltage has decreased or fluctuated
This device consists of three main parts: 1) Power supply circuit and voltage creation part 2) Main circuit part of the device 3) Display part
Switching power supply has two hot and cold parts. We don't touch the hot part with our hands, because it gives us a shock. In the next step, we check the capacitors in terms of appearance. If there was a problem, we should replace the capacitor. The biggest problem is related to changing the appearance of capacitors. They are often swollen.
We heat the capacitors with the help of a hot air heater. If the problem is solved, we replace the capacitors.
The main board consists of several blocks. The main board includes CPU, ram and rom.
When we turn on the device, the data is first transferred to the ram, so if the ram is damaged, the device will not start or only the red light will stay on.
There is an IC dream in the receiver. If this IC is damaged, the device will automatically change the channel. or a security error is shown. It even displays an error related to chip replacement.
There are two voltages in the tuner section. The horizontal voltage is 13 volts and the vertical voltage is 18 volts. If the IC lm317 is damaged, the 13 and 18 voltages will not be made and we have a constant 24V voltage in the tuner section.
Another important component is the crystal. The crystal is a mechanical part that produces frequency. If the crystal is damaged, the device will not turn on or the picture will be black and white, and the device will not be able to search and scan channels. The value of this crystal is usually 27 megahertz.
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Next to the crystal is an ic with the prefix lcx. This IC adjusts the circuit related to the lm317 regulator. If this IC is damaged, the Lm 317 regulator will not be able to adjust the voltage of 18 and 13 volts.
If your device has a good signal and the quality of the signal is good, but it is not able to receive the channels, the failure of the tuner can be the reason.
There are several capacitors on top of the CPU. If this capacitor is damaged, the image becomes dark or black and white. First, heat the capacitors with a hot air heater. If the problem is solved, replace the capacitors.
If the settings are lost after scanning the channels and turning off the device, there is a problem with IC Flash. You must program the IC. If the problem of the device is not solved by programming the IC, replace the IC.
I need to know basic electronics to repair receivers. That is, we must be able to identify electronic components and know how to test electronic components. It is necessary to have a soldering iron and a multimeter. If you do not have the experience of repairing electronic boards, be more careful
13 and 18 volts for the tuner are incorrectly described in the video. I'm sorry for this.
00:00 Initial check of the satellite receiver
01:22 Checking the receiver switching power supply
05:19 voltage measurement of the receiver switching power supply
06:23 Checking the main board of the digital receiver - satellite receiver
09:27 Dream IC and lm317 regulator controller
Satellite receivers are located in all places. These receivers will have problems after some time. Most of the failures of receivers are related to the switching power supply. The switching power supply of these receivers often has several outputs. Failure of the capacitors of the output section and the 400 volt storage capacitor causes the device to not work properly. Either it doesn't turn on or it stays on the red light. In this case, we do not have voltage. Either the voltage has decreased or fluctuated
This device consists of three main parts: 1) Power supply circuit and voltage creation part 2) Main circuit part of the device 3) Display part
Switching power supply has two hot and cold parts. We don't touch the hot part with our hands, because it gives us a shock. In the next step, we check the capacitors in terms of appearance. If there was a problem, we should replace the capacitor. The biggest problem is related to changing the appearance of capacitors. They are often swollen.
We heat the capacitors with the help of a hot air heater. If the problem is solved, we replace the capacitors.
The main board consists of several blocks. The main board includes CPU, ram and rom.
When we turn on the device, the data is first transferred to the ram, so if the ram is damaged, the device will not start or only the red light will stay on.
There is an IC dream in the receiver. If this IC is damaged, the device will automatically change the channel. or a security error is shown. It even displays an error related to chip replacement.
There are two voltages in the tuner section. The horizontal voltage is 13 volts and the vertical voltage is 18 volts. If the IC lm317 is damaged, the 13 and 18 voltages will not be made and we have a constant 24V voltage in the tuner section.
Another important component is the crystal. The crystal is a mechanical part that produces frequency. If the crystal is damaged, the device will not turn on or the picture will be black and white, and the device will not be able to search and scan channels. The value of this crystal is usually 27 megahertz.
Subscription link:
@electronic4u-david
Next to the crystal is an ic with the prefix lcx. This IC adjusts the circuit related to the lm317 regulator. If this IC is damaged, the Lm 317 regulator will not be able to adjust the voltage of 18 and 13 volts.
If your device has a good signal and the quality of the signal is good, but it is not able to receive the channels, the failure of the tuner can be the reason.
There are several capacitors on top of the CPU. If this capacitor is damaged, the image becomes dark or black and white. First, heat the capacitors with a hot air heater. If the problem is solved, replace the capacitors.
If the settings are lost after scanning the channels and turning off the device, there is a problem with IC Flash. You must program the IC. If the problem of the device is not solved by programming the IC, replace the IC.
I need to know basic electronics to repair receivers. That is, we must be able to identify electronic components and know how to test electronic components. It is necessary to have a soldering iron and a multimeter. If you do not have the experience of repairing electronic boards, be more careful
13 and 18 volts for the tuner are incorrectly described in the video. I'm sorry for this.
00:00 Initial check of the satellite receiver
01:22 Checking the receiver switching power supply
05:19 voltage measurement of the receiver switching power supply
06:23 Checking the main board of the digital receiver - satellite receiver
09:27 Dream IC and lm317 regulator controller
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