Hello to all, I have a problem in my skystar2 I can not receivetransponders in the polarization H I measured the voltage of theconnector skystar and change to a transponder in H and the tension was13v. But in the polarization H should have 18v. The skystar does not send the voltage of 18V to switch the polarization of LNB. Does anyone know any solution? Thanks in advance
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the power supply has intergrated inverter bit of a pain,no markings for voltages etc,also used in bush,sylvania etc,it has a touch panel on the side for the usual adjustments ,.
these NORMALLY suffer with the inverter output ceramic caps (3kv),on c231 &c230,an insulation test confirmed they were fine,and capacitance was within tolerance,all other lytic caps tested for esr returned good results.
it had all stable voltages ,but no voltage in inverter section??although a fluctuation on the standby voltage was due to the led's flashing in time with the flucuation.
it was hit and miss knowing what voltage goes where,it is a vestal afterall!things seemed fine as a guestamite.
to do component testing in the area of the inverter, from the smpt there are 2 ultra fast recovery diodes in parallel .
checks on these diodes and look for a shorted diode, (d105) a uf5402...
You don't mention a brand or model. Try unplugging from the wall socket for 15 minutes, and then re-apply power. It may have a hung up microprocessor or DAC. Or it may have a bad power supply. If it uses a 'wall wort' that plugs into the wall, check the specified voltages it is supposed to produce, and measure for correct output. tom
if you take the cover off the receiver and look at the power board you will find evidence of overheating and probably some capacitors that are bulging. it's probably cheaper to buy a new receiver unless you are able to start replacing parts yourself. I found a overheated board recently that came from factory with R30 missing.
check around your diodes near the voltage regulation area for either a very bad diode or a direct short sometimes its near the resistor pack and very hard to see. But if it were me I would just change out the power supply and be done with it.
the specs for the 4100 require a 12volt 2.5amp adapter with a 5.5mm OD amd 2.5mm ID tip with positive in the center. I have a some 12volt 4.0amp adapters withy the proper tip and polarity. This would be far superior to the spec one and will run much cooler. I can let you have one for $15. If interested email me.
You could check the voltages yourself to see if they are low. The horizontal polarity needs about 19 volts and the vertical polarity about 14 volts to work properly. If those voltages are lower by 25%, the receiver might failed to scan and that is when it locks up because is trying to find signal. The other issue could be a defective power supply if the receiver does not work after that 4 hours. There could be some capacitors that lost their dielectric strength causing the drop in voltage.
Let me know if you need further assistance.
I would suggest to check the plug on the av700 and see the polarity, it might be indicated there.
In regards to using any adapter, you could as long is the same polarity. The original adapter is 6 Volts and 2 Amperes.
OK changing the caps only resulted in proper filtering and voltage smoothing and did very little to solve your problem. Now what swollen caps are a sign of is an over voltage condition. what I would suggest because you may have a bad voltage regulator, is that you have to get a schematic and measure the voltage levels on the power supply to determine if they are correct or not. This will tell you if the regulator is bad or not. You do have a power supply problem you just have to determine where in the power supply. This can be done with the schematic and a voltmeter.