How to fix this R4 log?? [Fatal Error: DownOneChipFreqOneStep Chain[-1] has...]

[lazypolarbears]

Check chain[7] PIC fw version=0x02
Chain[J6] orignal chain_voltage=57 value=910
Chain[J8] orignal chain_voltage=57 value=910
Chain[J6] has 0 asic
retry Chain[J6] has 0 asic
retry Chain[J6] has 0 asic
retry Chain[J6] has 0 asic
retry Chain[J6] has 0 asic
retry Chain[J6] has 0 asic
retry Chain[J6] has 0 asic
Chain[J8] has 63 asic
Chain[J8] has core num in PIC
Hi,

Wanted to see if anybody knew how to fix this before I go about shipping it back to China. This is an Antminer R4 8.7Th/s - Worked for a day then got this kernel log error (just copied pasted the end).

I've tried everything: flashing the firmware, hard reset, etc... even tried moving the physical chains on the control board...

Help would be nice - thanks in advance!!~
 

miner total rate=8889GH/s fixed rate=8700GH/s
read PIC voltage=910 on chain[7]
Chain:7 chipnum=63
Chain[J8] voltage added=0.4V
OK: Chain[J8] is for this machine! [minerMAC: 48:99:e7:97:4d:cd]
Chain:7 temp offset=-85
Chain:7 base freq=581
Asic[ 0]:581
Asic[ 1]:625 Asic[ 2]:625 Asic[ 3]:581 Asic[ 4]:625 Asic[ 5]:625 Asic[ 6]:606 Asic[ 7]:625 Asic[ 8]:587
Asic[ 9]:606 Asic[10]:581 Asic[11]:625 Asic[12]:606 Asic[13]:625 Asic[14]:625 Asic[15]:606 Asic[16]:625
Asic[17]:606 Asic[18]:606 Asic[19]:625 Asic[20]:625 Asic[21]:606 Asic[22]:625 Asic[23]:625 Asic[24]:606
Asic[25]:625 Asic[26]:612 Asic[27]:612 Asic[28]:625 Asic[29]:625 Asic[30]:625 Asic[31]:625 Asic[32]:618
Asic[33]:625 Asic[34]:625 Asic[35]:625 Asic[36]:625 Asic[37]:625 Asic[38]:625 Asic[39]:625 Asic[40]:625
Asic[41]:625 Asic[42]:625 Asic[43]:625 Asic[44]:625 Asic[45]:625 Asic[46]:625 Asic[47]:625 Asic[48]:625
Asic[49]:625 Asic[50]:625 Asic[51]:587 Asic[52]:625 Asic[53]:625 Asic[54]:612 Asic[55]:625 Asic[56]:625
Asic[57]:625 Asic[58]:625 Asic[59]:625 Asic[60]:625 Asic[61]:625 Asic[62]:625
Chain:7 max freq=625
Chain:7 min freq=581


Miner fix freq ...
Fatal Error: DownOneChipFreqOneStep Chain[-1] has Wrong chip index=7893805

[1713906703]

1713906703

[NotFuzzyWarm]

ref: https://bitcointalk.org/index.php?topic=1757583.0 for this same topic...
And no, so far it seems the only cure is sending the miner in for repair.

[lazypolarbears]

Thanks I appreciate it - tried looking for a thread on here first but somehow missed that. And thanks for the advice although wasn't exactly what I was hoping to hear.... 3 defective out of 18 R4's so far :<

[philipma1957]

Thanks I appreciate it - tried looking for a thread on here first but somehow missed that. And thanks for the advice although wasn't exactly what I was hoping to hear.... 3 defective out of 18 R4's so far :<

Yeah that is about 16.67%

I estimate a 10 to 15% rate for r4 and s9.  So your rate seems normal.

[jamesb777]

If anyone else gets this error... whatever you do, don't leave your miner on in this state for long, I've had 2 boards burn themselves up literally.  The chips are heated highly, and the top right VRM chip started smoking in one.

[lazypolarbears]

Holy crap are you serious???!!

[philipma1957]

if one board works and one does not just unplug the dead board from the psu.

the good board will run fine.

1 board attached  been running for 2-3 weeks

[lazypolarbears]

Well I have all 7 PCIe's plugged in as of current; they'll be shipped (whole units) back to BITMAIN in a week or so... I unplugged the one with the "Fatal Error" and that last post was making me so OCD that I just posted a new topic on S3/S5/S7/9/(mostly R4) fires ever occurring and in what situation....

4 defective or half-hashing out of 18 - this is ridiculous.

[lazypolarbears]

if one board works and one does not just unplug the dead board from the psu.

the good board will run fine.

1 board attached  been running for 2-3 weeks

Yes, I have 2 that have one good board... (7.5 and 8.7) they're still working. BITMAIN better not be slow about the repair/replacement... :/