Here is something from someone else it doesn't say they have tried it on the 4000 but it may help.
If you have a dead 5000 or 6000 coolsat box try this, replace this part (see pictures) I have fix 1 5000 and 1 6000 box now. one that had no lights or any power on it and 1 that had dim lights on it and both had the same part bad, you can use any volts that are over 6.3 but you must use
1000 uf. I can not say for sure all boxs have the same volts or uf how ever i have look at 4 boxs and all were the same. the part I used was 25 v 1000 uf
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THANKS TO BOBOISNO1 FOR THIS POST