When burned C422 i replace from another demaged dm 500 and and i tested i getting hot on D46 Diode and i change ferite beed inductor with maybe another value now is getting Hot on C422 why on the start diode D46 and capacitor i no have any voltage no 12v.
ceramic capaitor and ferrite bead must be correct value NF?
and i forgot receiver give shorted to the ground. Tnx
C422 can only "BURN" with the wrong polarity
D46 or C421 is shorted! someone supplied the wrong polarity voltage to the dm500. the center pin must be positive. The ferrite bead is NOT THE ISSUE. it can be replaced with a piece of wire.
Remove L404 and see if you still have a shorted to ground
Post a picture of the adaptor you are using so I can see the label. It must be a 12v center positive adaptor
i replace electrolit capacitor 100uf 25v on C422 point because i no have tantalum capacitor and receiver again is alive but adapter is 12v 1.5A and works receiver 30 sec and shut down lost all power like no connected on AC green diode off i don't know why
it is posible to works with this capacitor ? and dreambox is 12V 2A can i put adapter 12v 3A ? thanks for you answer and for your help
i replace electrolit capacitor 100uf 25v on C422 point because i no have tantalum capacitor and receiver again is alive but adapter is 12v 1.5A and works receiver 30 sec and shut down lost all power like no connected on AC green diode off i don't know why
it is posible to works with this capacitor ? and dreambox is 12V 2A can i put adapter 12v 3A ? thanks for you answer and for your help
The adaptor could be bad. What happens to the 12 volts when the receiver turns off?, Yes you can use the 12v 3a adaptor as long as the center pin is positive. The 100µf cap will be ok.
When receiver turns off it is same like dead no any power
can i use adapter 12v 8A ? adapter must to have filter on cable ? because original dreambox adapter have filter MAGNET
i plug in adapter 12V 3A original adapter of drembox 800 i now burn first ceramic smd capacitor C421 i don't know to read this ceramic capacitors i have ceramic capacitors from demaged graphic cards
can i use biger capacitor or must same size to be ? and correct Nf Uf
must to be ?
c421 can be almost any ceramic cap that looks about the same size, the cap is not that important in the circuit. It can be left out if you like to check the receiver with the original adaptor
There is no reason for C421 to burn, It is just across the 12 volt input, the cap may have been bad, Look at where it is in the schematic, there is no reason for it to burn, in fact you can leave the cap out of circuit. Does the receiver work without C421 in place? If there was a short in the receiver, L404 would burn up, not C421
Now after test without C421 capacitor i no have anymore green lamp i replace again another capacitor and green diode is off like dead
i will try to send video link on youtube to see it
If C421 is burning It is either NOT a capacitor (maybe a resistor or inductor?) or it is shorted!
Take C421 out of the receiver and connect the 12v adaptor across it, if it burns it is bad. These ceramic capacitors are usually rated higher than 12 volts.
Where did you get this replacement capacitor? A capacitor is OPEN CIRCUIT, with 12 volts DC applied
The video is too hard to watch, it is way too shaky
Again, C421 is NOT required for the receiver to work. If you don't have the green led, I suspect you have a burnt/broken circuit trace between the DC jack and L404
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