Troubleshooting and repair guide for AvalonMiner models 721, 741, 761, 821 & 841

[NotFuzzyWarm]

I might just do that or simply use the gimpy 741 as a donor miner for my others. I already have a 841 that should arrive today that will be taking the 741's power allocation so will actually be ahead in THs when I put it online and take the 741 off.

One example of the thermal circuit boards are these from Epic https://www.epectec.com/pcb/aluminum-circuit-boards.html

[1713920892]

1713920892

[Megaquake]

 I believe this would be the best place to post this, the MOD can delete the thread I started on the main board.

 I Have an 841 that just wants to run at 15.8TH/s+ no matter what I set the voltages at even the max temperature setting seems no help.



 Once it goes above the max temperature it will slow down to normal speeds, cools then repeats!

[Steamtyme]

Have you played with the "more options" feature.

If not, from what I remember the basic voltage offset option actually doesn't do anything.

https://bitcointalk.org/index.php?topic=3375954.msg35984423#msg35984423

Here is the beginning of the posts that first covered the commands. The level adjustment has a greater effect.

[Megaquake]

Have you played with the "more options" feature.

If not, from what I remember the basic voltage offset option actually doesn't do anything.

https://bitcointalk.org/index.php?topic=3375954.msg35984423#msg35984423

Here is the beginning of the posts that first covered the commands. The level adjustment has a greater effect.

Yes I am affluent on those just take a look at the next post down from the one you linked up

[HagssFIN]

^ Try forcing it to default or -1, see if that has any effect.

[Steamtyme]

Yes I am affluent on those just take a look at the next post down from the one you linked up

Missed that on the phone yesterday, I've replied in your specific thread, fairly interested to get more details on the issue. Almost a bonus if there are no adverse affects.

[gvb]

hello,

I have a software related question...

I have added the pool & solo CK server to my 741.

But from what I can see only the first one (pool 0) is being used.

Pool: 1
URL: stratum+tcp://de.ckpool.org:3333
StratumActive: false
Status: Alive
   
Doesn't the controller software have the load balancing mode as option?

The main screen also mentions "1 module active" does that mean 1 full device or 1 of the 2 boards of 1 device?
Or is this a software module?

[Steamtyme]

You will only see 1 pool active at a time, as you can't send work to more than one place at a time. The other 2 are just there in case the first one fails for whatever reason.

I'm not sure what you mean about the 1 module active, can you post a screen cap? If on the miner status page you are seeing a hashrate of around 7.3 everything should be fine.

Wait you are probably in the basic main status page, if so and you see 1 module, I'm pretty sure that means 1 miner. Click on the advanced button for a better overview of what is going on with you machines. This is step 2 in the OP for this thread.

From here you can check the status page, and the API log. These 2 pages will let you know if there are any problems. You can also post screenshots and someone can look them over with you.

[gvb]

I added --balance to the additional options and now both servers are active.

but the second server's GetWorks counter goes up sometimes but it doesn't seem to receive jobs.

Is there a way to get rid of that third server? I can't disable it and I don't know if entering the same server twice is a good idea.

[Megaquake]

^ Try forcing it to default or -1, see if that has any effect.

Yes I tried both and even dusted it out, changed controller oh well, I guess I will leave it like that with an A/C duct pointed right at it it stays at 14.8 to 15.1 TH/s @ 30 / 86c

the other 2 next to it run 13.6TH/s each  26 / 78c and 26 / 73c respectively.

hello,

I have a software related question...

You may need to disable failover mode

[Megaquake]

Any place in the US do warranty work on these, I am going to get that done that miner is too unstable mining at 15TH/s then mines at 5-6 TH;s for a good period of time and tried everything from a new PSU, controller and new MM firmware

[NotFuzzyWarm]

The point of the Avalons is that the user can troubleshoot them and narrow the problem down to a board. At that point Canaan or the distributor you bought it from can send a replacement board.

Have you even tried the trouble shooting procedures outlined on the 1st page? Have you opened a support ticket with the distributor or Canaan?

[cryptomench]

Has anyone had trouble with CGMiner constantly restarting?

It's only just started recently, it will run and then idle/CG miner restarts. My CGMiner elapsed time generally doesn't go over 5mins... see graph below.

Is my controller screwed?

https://imgur.com/a/g1iG0YP - graph showing, dip/restart

https://imgur.com/a/x3TTXiU - Elapsed time restarting also date seems to be wrong, not sure if that matters.

I'm getting  ECHU[16 0 0 144], not sure what this error means. It says it's just an overflow? is this the problem?

Code:

[Firmware Version] => Avalon Firmware - 20170603
    luci: ffc1d59
    cgminer: 2354004
    cgminer-packages: d309c69
Reply was 'STATUS=S,When=1483452143,Code=70,Msg=CGMiner stats,Description=cgminer 4.10.0|STATS=0,ID=AV70,Elapsed=135,Calls=0,Wait=0.000000,Max=0.000000,Min=99999999.000000,MM ID1=Ver[7411706-3162860]
    DNA[013b3d22b7084e66]
    Elapsed[137]
    MW[1518 1509 1496 1496]
    LW[6019]
    MH[0 1 0 0]
    HW[1]
    DH[0.000%]
    Temp[31]
    TMax[85]
    Fan[2850]
    FanR[29%]
    Vi[1199 1199 1196 1196]
    Vo[4415 4434 4415 4424]
    PLL0[1455 1361 0 0 0 0]
    PLL1[1391 1425 0 0 0 0]
    PLL2[1317 1499 0 0 0 0]
    PLL3[2738 78 0 0 0 0]
    GHSmm[6915.47]
    WU[91909.02]
    Freq[613.94]
    PG[15]
    Led[0]
    MW0[7 7 13 3 6 1 3 9 10 4 5 8 5 8 3 4 6 3 5 5 6 2]
    MW1[5 6 2 3 5 4 3 0 4 5 9 5 1 4 6 2 5 5 8 5 5 3]
    MW2[11 4 8 5 4 3 6 5 4 4 3 3 3 4 2 6 5 6 7 3 1 4]
    MW3[0 4 5 3 6 4 3 5 4 4 2 6 3 5 1 9 6 10 4 6 6 6]
    TA[88]
    ECHU[16 0 0 144]
    ECMM[0]
    FAC0[0]
    SF0[600 636 672 708 744 780]
    SF1[600 636 672 708 744 780]
    SF2[600 636 672 708 744 780]
    SF3[600 636 672 708 744 780]
    PMUV[12c0 12c0]
    ERATIO0[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    ERATIO1[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    ERATIO2[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    ERATIO3[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    C_0_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    GHSmm00[78.74 79.14 78.92 78.38 78.71 78.67 79.39 78.38 78.82 78.35 77.66 79.10 79.10 78.71 78.38 78.74 78.82 78.71 79.03 78.38 78.89 79.18]
    GHSmm01[78.89 78.46 78.89 79.54 78.31 78.85 79.14 78.89 78.53 79.28 77.20 79.14 79.03 79.03 79.39 79.50 79.14 79.21 78.64 79.10 78.92 79.75]
    GHSmm02[79.03 79.57 79.46 79.18 79.32 78.92 79.03 78.67 79.03 79.03 78.67 79.07 79.64 79.14 78.74 79.25 79.10 79.03 79.18 79.46 79.32 79.61]
    GHSmm03[76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.91 76.80 76.80 76.91 77.02 76.87 77.34 76.91 77.23 77.27 76.87]
    FM[1]
    CRC[0 0 0 0]
    PAIRS[0 0 0]
    PVT_T[21-70/11-78/74 1-76/12-85/80 20-67/12-77/72 20-65/14-72/68],MM Count=1,Smart Speed=1,Connecter=AUC,AUC VER=AUC-20151208,AUC I2C Speed=400000,AUC I2C XDelay=19200,AUC Sensor=16290,AUC Temperature=25.65,Connection Overloaded=false,Voltage Offset=0,Nonce Mask=29,USB Pipe=0,USB Delay=r0 0.000000 w0 0.000000,USB tmo=0 0|STATS=1,ID=POOL0,Elapsed=135,Calls=0,Wait=0.000000,Max=0.000000,Min=99999999.000000,Pool Calls=0,Pool Attempts=0,Pool Wait=0.000000,Pool Max=0.000000,Pool Min=99999999.000000,Pool Av=0.000000,Work Had Roll Time=false,Work Can Roll=false,Work Had Expire=false,Work Roll Time=0,Work Diff=7192.00000000,Min Diff=4795.00000000,Max Diff=7192.00000000,Min Diff Count=292,Max Diff Count=127,Times Sent=36,Bytes Sent=4834,Times Recv=43,Bytes Recv=6035,Net Bytes Sent=4834,Net Bytes Recv=6035|STATS=2,ID=POOL1,Elapsed=135,Calls=0,Wait=0.000000,Max=0.000000,Min=99999999.000000,Pool Calls=0,Pool Attempts=0,Pool Wait=0.000000,Pool Max=0.000000,Pool Min=99999999.000000,Pool Av=0.000000,Work Had Roll Time=false,Work Can Roll=false,Work Had Expire=false,Work Roll Time=0,Work Diff=8192.00000000,Min Diff=8192.00000000,Max Diff=8192.00000000,Min Diff Count=16,Max Diff Count=16,Times Sent=2,Bytes Sent=149,Times Recv=5,Bytes Recv=3119,Net Bytes Sent=149,Net Bytes Recv=3119|STATS=3,ID=POOL2,Elapsed=135,Calls=0,Wait=0.000000,Max=0.000000,Min=99999999.000000,Pool Calls=0,Pool Attempts=0,Pool Wait=0.000000,Pool Max=0.000000,Pool Min=99999999.000000,Pool Av=0.000000,Work Had Roll Time=false,Work Can Roll=false,Work Had Expire=false,Work Roll Time=0,Work Diff=0.00000000,Min Diff=0.00000000,Max Diff=0.00000000,Min Diff Count=0,Max Diff Count=0,Times Sent=2,Bytes Sent=149,Times Recv=4,Bytes Recv=1658,Net Bytes Sent=149,Net Bytes Recv=1658|'
[STATUS] =>
(
   [STATUS] => S
   [When] => 1483452143
   Code => 70
   [Msg] => CGMiner stats
   [Description] => cgminer 4.10.0
)
[STATS0] =>
(
   [STATS] => 0
   [ID] => AV70
   [Elapsed] => 135
   [Calls] => 0
   [Wait] => 0.000000
   [Max] => 0.000000
   [Min] => 99999999.000000
   [MM ID1] => Ver[7411706-3162860]
    DNA[013b3d22b7084e66]
    Elapsed[137]
    MW[1518 1509 1496 1496]
    LW[6019]
    MH[0 1 0 0]
    HW[1]
    DH[0.000%]
    Temp[31]
    TMax[85]
    Fan[2850]
    FanR[29%]
    Vi[1199 1199 1196 1196]
    Vo[4415 4434 4415 4424]
    PLL0[1455 1361 0 0 0 0]
    PLL1[1391 1425 0 0 0 0]
    PLL2[1317 1499 0 0 0 0]
    PLL3[2738 78 0 0 0 0]
    GHSmm[6915.47]
    WU[91909.02]
    Freq[613.94]
    PG[15]
    Led[0]
    MW0[7 7 13 3 6 1 3 9 10 4 5 8 5 8 3 4 6 3 5 5 6 2]
    MW1[5 6 2 3 5 4 3 0 4 5 9 5 1 4 6 2 5 5 8 5 5 3]
    MW2[11 4 8 5 4 3 6 5 4 4 3 3 3 4 2 6 5 6 7 3 1 4]
    MW3[0 4 5 3 6 4 3 5 4 4 2 6 3 5 1 9 6 10 4 6 6 6]
    TA[88]
    ECHU[16 0 0 144]
    ECMM[0]
    FAC0[0]
    SF0[600 636 672 708 744 780]
    SF1[600 636 672 708 744 780]
    SF2[600 636 672 708 744 780]
    SF3[600 636 672 708 744 780]
    PMUV[12c0 12c0]
    ERATIO0[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    ERATIO1[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    ERATIO2[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    ERATIO3[0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%]
    C_0_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_00[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_01[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_02[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_03[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_0_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_1_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_2_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    C_3_04[    0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0]
    GHSmm00[78.74 79.14 78.92 78.38 78.71 78.67 79.39 78.38 78.82 78.35 77.66 79.10 79.10 78.71 78.38 78.74 78.82 78.71 79.03 78.38 78.89 79.18]
    GHSmm01[78.89 78.46 78.89 79.54 78.31 78.85 79.14 78.89 78.53 79.28 77.20 79.14 79.03 79.03 79.39 79.50 79.14 79.21 78.64 79.10 78.92 79.75]
    GHSmm02[79.03 79.57 79.46 79.18 79.32 78.92 79.03 78.67 79.03 79.03 78.67 79.07 79.64 79.14 78.74 79.25 79.10 79.03 79.18 79.46 79.32 79.61]
    GHSmm03[76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.80 76.91 76.80 76.80 76.91 77.02 76.87 77.34 76.91 77.23 77.27 76.87]
    FM[1]
    CRC[0 0 0 0]
    PAIRS[0 0 0]
    PVT_T[21-70/11-78/74 1-76/12-85/80 20-67/12-77/72 20-65/14-72/68]
   [MM Count] => 1
   [Smart Speed] => 1
   [Connecter] => AUC
   [AUC VER] => AUC-20151208
   [AUC I2C Speed] => 400000
   [AUC I2C XDelay] => 19200
   [AUC Sensor] => 16290
   [AUC Temperature] => 25.65
   [Connection Overloaded] => false
   [Voltage Offset] => 0
   [Nonce Mask] => 29
   [USB Pipe] => 0
   [USB Delay] => r0 0.000000 w0 0.000000
   [USB tmo] => 0 0
)
[STATS1] =>
(
   [STATS] => 1
   [ID] => POOL0
   [Elapsed] => 135
   [Calls] => 0
   [Wait] => 0.000000
   [Max] => 0.000000
   [Min] => 99999999.000000
   [Pool Calls] => 0
   [Pool Attempts] => 0
   [Pool Wait] => 0.000000
   [Pool Max] => 0.000000
   [Pool Min] => 99999999.000000
   [Pool Av] => 0.000000
   [Work Had Roll Time] => false
   [Work Can Roll] => false
   [Work Had Expire] => false
   [Work Roll Time] => 0
   [Work Diff] => 7192.00000000
   [Min Diff] => 4795.00000000
   [Max Diff] => 7192.00000000
   [Min Diff Count] => 292
   [Max Diff Count] => 127
   [Times Sent] => 36
   [Bytes Sent] => 4834
   [Times Recv] => 43
   [Bytes Recv] => 6035
   [Net Bytes Sent] => 4834
   [Net Bytes Recv] => 6035
)
[STATS2] =>
(
   [STATS] => 2
   [ID] => POOL1
   [Elapsed] => 135
   [Calls] => 0
   [Wait] => 0.000000
   [Max] => 0.000000
   [Min] => 99999999.000000
   [Pool Calls] => 0
   [Pool Attempts] => 0
   [Pool Wait] => 0.000000
   [Pool Max] => 0.000000
   [Pool Min] => 99999999.000000
   [Pool Av] => 0.000000
   [Work Had Roll Time] => false
   [Work Can Roll] => false
   [Work Had Expire] => false
   [Work Roll Time] => 0
   [Work Diff] => 8192.00000000
   [Min Diff] => 8192.00000000
   [Max Diff] => 8192.00000000
   [Min Diff Count] => 16
   [Max Diff Count] => 16
   [Times Sent] => 2
   [Bytes Sent] => 149
   [Times Recv] => 5
   [Bytes Recv] => 3119
   [Net Bytes Sent] => 149
   [Net Bytes Recv] => 3119
)
[STATS3] =>
(
   [STATS] => 3
   [ID] => POOL2
   [Elapsed] => 135
   [Calls] => 0
   [Wait] => 0.000000
   [Max] => 0.000000
   [Min] => 99999999.000000
   [Pool Calls] => 0
   [Pool Attempts] => 0
   [Pool Wait] => 0.000000
   [Pool Max] => 0.000000
   [Pool Min] => 99999999.000000
   [Pool Av] => 0.000000
   [Work Had Roll Time] => false
   [Work Can Roll] => false
   [Work Had Expire] => false
   [Work Roll Time] => 0
   [Work Diff] => 0.00000000
   [Min Diff] => 0.00000000
   [Max Diff] => 0.00000000
   [Min Diff Count] => 0
   [Max Diff Count] => 0
   [Times Sent] => 2
   [Bytes Sent] => 149
   [Times Recv] => 4
   [Bytes Recv] => 1658
   [Net Bytes Sent] => 149
   [Net Bytes Recv] => 1658
)

[Steamtyme]

Hey there,

What are your ambient temperatures. One of the errors, the 144 is a combination of the 16, and the 128. The 128 is a warning regarding a "too hot" situation on the control board, but I think it relates to the specific hashboard, not sure.

I'm guessing this is a 741? Has it been cleaned out recently? Did you make any changes?

[HagssFIN]

I had a mistake in the bitcointalk forum version of this guide.

The mistake was in the Table 1. AvalonMiner LED colors.

There was an image of PMU LED colors table, which is obviously a wrong image.

I have put the right image in place now.

It took me too long to notice the error, sorry.  

The .pdf document version has been ok the whole time.



BTW. Steven has posted a neat promotional video for the AvalonMiner 851 at the Canaan.io website.
The video also mentions the easy DIY repairs, which this guide supports.  

Direct link to the video: https://youtu.be/pJmJ4nFOiig

[cromsps]

Hello,

I have a few M3, and now I'm getting 2 x 741,
but I have a problem with power cost and noise, so I made a search and I
read somewhere how to put the Fan working only at 70% by editing a file, or one option to set 0, -1 or -2 to consume less power and make less noise,
but I  cannot find it now  
Can you please help me ?

EDIT:  Ok I found it, its here https://bitcointalk.org/index.php?topic=2521707.0
Thanks :-)

[cromsps]

Has anyone had trouble with CGMiner constantly restarting?

It's only just started recently, it will run and then idle/CG miner restarts. My CGMiner elapsed time generally doesn't go over 5mins... see graph below.

[...]

Hello,

Could you solve this ?

I have 2 separate 741, and they both are making what you described above. So it cannot be a cable, a fan, or a sensor, cause it happens on separate systems...
I'm running out of ideas ... Are you using NiceHash?

[HagssFIN]

Have you tried reflashing the openwrt firmware?

What is your psu for the rasp pi?

Have you tried another rasp pi?

[cromsps]

Have you tried reflashing the openwrt firmware?

What is your psu for the rasp pi?

Have you tried another rasp pi?

Hello @Hagss,

yes, I've reflash the firmware 3 times... The first time I had issues with my router, then I picked up another image (the most recent) from here
https://canaan.io/downloads/people/mikeqin/avalon741/openwrt/nicehash/20170719/ and after configurating everything was ok. Then after this problem, I tried on more time with this image.

My PSU for the PI its a 2.4amp, I know that it was supposed to be at least a 2.5amp, but this is a PI 2 B, wich consumes far more less power... do you think it can be from here?? is it possible that if the PI looses power the Miner Restarts? cause its just one second and I hear the Fan coming up and start see it on GUI.

No, I have not tried another PI

[HagssFIN]

You are ok with that firmware
and the psu is also ok for the Rasp Pi 2.

But one more question about the psu, is it a good quality one?