Blew up my Gridseed, Anyone help me identify SMD capacitor or resistor?

[lechango]

Hey guys, forgive me if I am not posting in the right forum. I recently got a gridseed miner and stupidly had my lead and negative wires swapped on my psu, even more stupid I did not check with a multimeter first and plugged it straight into the gridseed. Needless to say there was quite a big spark.

Surprisingly the unit still powers on, is detected via usb, and even displays normal Kh/s, however it doesn't accept any shares. After opening it up I found I had fried two of what appear to be smd capacitors, but everything else looks OK.

Here is an image with the capacitors (or resistors maybe?) in question. If anyone is able to help me identify these so I can attempt to solder on new ones, it would be greatly appreciated and I am willingly to donate a small amount of btc or ltc for the effort. There is no markings on these, so from the research I've done I assumed they were capacitors. https://i.imgur.com/AagZtd2.jpg

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[BillTech]

look like surface mounted diodes and that makes sense with reverse polarity hook up
maybe desolder and check for continuity no continuity = fried easy fix

[braindead]

No, they are diodes to protect circuit, you can just xunt them but you no longer have protection in electric circuit, better place new diodes

[Photon939]

Not sure what SMD crap the last two posters have been looking at, but they are definitely two ceramic capacitors. Could also be picofuses or inductors. Hard to say anymore, some of the SMD stuff can all look the same. Do you have a better shot of the pcb?

 It doesn't look like they're part of an SMPS circuit and ceramic caps usually don't care about polarity so it's rather odd that they're the only parts that exploded. Has anyone posted a schematic for these yet? If they're just power filtering caps then pretty much any value with the same footprint should work.

[backtrackit]

Not sure what SMD crap the last two posters have been looking at, but they are definitely two ceramic capacitors. Could also be picofuses or inductors. Hard to say anymore, some of the SMD stuff can all look the same. Do you have a better shot of the pcb?

 It doesn't look like they're part of an SMPS circuit and ceramic caps usually don't care about polarity so it's rather odd that they're the only parts that exploded. Has anyone posted a schematic for these yet? If they're just power filtering caps then pretty much any value with the same footprint should work.

What he said and I think you are going to find more problems. I can't see how blown caps would prevent shares been accepted?

[philipma1957]

Not sure what SMD crap the last two posters have been looking at, but they are definitely two ceramic capacitors. Could also be picofuses or inductors. Hard to say anymore, some of the SMD stuff can all look the same. Do you have a better shot of the pcb?

 It doesn't look like they're part of an SMPS circuit and ceramic caps usually don't care about polarity so it's rather odd that they're the only parts that exploded. Has anyone posted a schematic for these yet? If they're just power filtering caps then pretty much any value with the same footprint should work.

What he said and I think you are going to find more problems. I can't see how blown caps would prevent shares been accepted?

op  buy these leads if they glow blue you are cool(correct wiring) if they glow red you are dead  (reversed wiring)


http://www.mcmelectronics.com/product/82-12675

frankly you tell the seller that provided these for the gridseeds.  

so this can not happen.  


Also maybe the seller would be helpful  especially if he sent the plug that you mis wired.

You know that if the wiring on the plug is not code for the country you live in and the seller provided the plug to you he would lose in small claims court.

Just saying  it should put sellers on their toes to:

 provide the plug above or provide no plug at all.

  At least warn that  the plug used must be center positive and meter checked.  Did your seller do this?

[BillTech]

Not sure what SMD crap the last two posters have been looking at, but they are definitely two ceramic capacitors. Could also be picofuses or inductors. Hard to say anymore, some of the SMD stuff can all look the same. Do you have a better shot of the pcb?

 It doesn't look like they're part of an SMPS circuit and ceramic caps usually don't care about polarity so it's rather odd that they're the only parts that exploded. Has anyone posted a schematic for these yet? If they're just power filtering caps then pretty much any value with the same footprint should work.

your not sure what were lookin at?
the 2 things in the circle next to the power jack...
looked like surface mounted diodes just my 2c

[lechango]

Appreciate the replies so far guys. As far as contacting the seller, it really is not his fault. I did buy a 12V 30A psu with it and it did not come with wires, so I stripped a regular old power cord and it was my fault that I reversed the lead and negative wires going to the PSU.

I believe the reason those caps blew is because they caught on fire because they were closest to the dc jack that pretty much spat fire.

unless someone can find a schematic, I'm thinking it's pretty much near impossible to figure out what these dudes are, as there are no markings. Def look like surface mount capacitors from the research I've done, however I wouldn't have any idea what uF

[braindead]

Appreciate the replies so far guys. As far as contacting the seller, it really is not his fault. I did buy a 12V 30A psu with it and it did not come with wires, so I stripped a regular old power cord and it was my fault that I reversed the lead and negative wires going to the PSU.

I believe the reason those caps blew is because they caught on fire because they were closest to the dc jack that pretty much spat fire.

unless someone can find a schematic, I'm thinking it's pretty much near impossible to figure out what these dudes are, as there are no markings. Def look like surface mount capacitors from the research I've done, however I wouldn't have any idea what uF

Dude, just remove them and make a xunt, then try it 

[BillTech]

the letter marking on circuit board should give you a clue maybe what is it? r c or d in it?

[lechango]

Appreciate the replies so far guys. As far as contacting the seller, it really is not his fault. I did buy a 12V 30A psu with it and it did not come with wires, so I stripped a regular old power cord and it was my fault that I reversed the lead and negative wires going to the PSU.

I believe the reason those caps blew is because they caught on fire because they were closest to the dc jack that pretty much spat fire.

unless someone can find a schematic, I'm thinking it's pretty much near impossible to figure out what these dudes are, as there are no markings. Def look like surface mount capacitors from the research I've done, however I wouldn't have any idea what uF

Dude, just remove them and make a xunt, then try it 

Could you explain what an xunt is? Never heard the term before, tried googling it but no luck

[medUSA]

I don't know much about electronics, but know enough to read the label next to the component.
Like if white label says C123, it must be a capacitor, R123 must be a resistor.

The label for the concerned component looks like is starting with FB, so must be a Ferric Bead.

[nybbler905]

I don't know much about electronics, but know enough to read the label next to the component.
Like if white label says C123, it must be a capacitor, R123 must be a resistor.

The label for the concerned component looks like is starting with FB, so must be a Ferric Bead.

what he said plus Z for some diodes ( Zener as in voltage regulation, not regular diodes) D for Diodes.

http://www.bitcoinguru.com.au/uploads/2/5/8/4/25849432/4449378_orig.jpg
best photo i could find, i'd swear it's a ferrite bead (starts with F )

[BillTech]

I don't know much about electronics, but know enough to read the label next to the component.
Like if white label says C123, it must be a capacitor, R123 must be a resistor.

The label for the concerned component looks like is starting with FB, so must be a Ferric Bead.

just found a better image and it does look like FB23 FB24 on board

[TrollboxChamp]

just read this whole thread and that was some great detective work 

[phuture]

indeed, FB23 and FB24 are ferric beads. according to schema it's more specific 2300ohm@100MHz,3A. i found the schema at github repository https://github.com/gridseed/usb-miner/tree/master/hardware
i made similar mistake and connect power to the miner in wrong order. i can see that FB23 is completely blew up, but there is possibility that other FBs can be wrong. i mean FB22, FB25, FB26, FB27, FB28.