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IanL-S

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Reply with quote  #1 
[mad][bawl][bawl]

My 2470 ("inherited" from my mother-in-law) has had a hard life, including a period running either 2400 or 5300 firmware. Reverted to 2470 firmware (as I was having issues with the RCU). Worked OK for a while then the RCU issues reappeared. Then it died. Turned off the rear power switch and forgot about it. Decided to fix it (and my 7160). Took it out of the cabinet and put it on the kitchen table, plugged it in and it booted up ... then the smell of burning. Turned it off, and discovered the STAT/Power Connector to the HDD was partially melted (see photo below).BurntConnector.png 

Replaced the cables and the beast would not boot. Looks like the power board is dying (explaining the various issues).

Fortunately the HDD is OK - ran WD Data Lifegard Utilities (extended) and clean report. To be on the safe side I backed up any useful recordings and the ProgramFiles directory. Not sure if it is worth replacing or fixing the power supply. (update: But I tried it anyway.)

Ian
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Fred

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Reply with quote  #2 
I've been running a 2470 PSU in a 2400,fairly sure it also works the other way around if you can track down a 2400 PSU.Plenty of 2400 MB develop faults so i guess there should be some PSU kicking around.
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IanL-S

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Reply with quote  #3 
Thanks Fred. Providing it fits in (over the years the size and placement of 2400/2460 power supply boards changed.

If I get a chance I will see if the power supply from a TF-T6000 can be swaped in. I have two of them (one pre-production engineering sample) that I do not use.

Ian
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IanL-S

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Reply with quote  #4 
The problem is not the power supply - replaced it and still no HDD. Had power adaptor for Molex connection and using it to power the HDD it worked. Looks like a problem between the Molex connector on the main board and the power supply. Being a 2470 (they can be very iffy) doubt that there is any point in trying to get it fixed. At least I got a spare power supply in case something goes wrong with one of my 2400s.

Ian
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AQUAR

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Reply with quote  #5 
Do you mean, its a problem with the main board power routing?
If so I'd be looking for burned tracks, dry solder joints and failed electrolytic filter capacitors.

If its just a power cabling issue - why not rewire a standard PC molex connector by "swapping the pins" or crossing the wires after cutting them?   
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Fred

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Reply with quote  #6 
Quote:
Originally Posted by AQUAR
Do you mean, its a problem with the main board power routing?
If so I'd be looking for burned tracks, dry solder joints and failed electrolytic filter capacitors.


Both the 2400 & 2470 MB could develop a myriad of faults,HDMI output flakey,not recognizing HDD,regular re-booting itself at random or not booting at all,etc.,all well documented on Forums.  
Not as big a sample as Forums but my Brother's Computer Club members started buying the 2400 around 2012 and many had MB faults develop after 2 or 3 years of use.They put it down to poor QC with the Wave soldering as the faults seemed to run in batches but more likely component failure you would think as many people at the same time had trouble free runs with the 2400. 
The big problem was that Toppy. Silverwater/Sydney stopped(2014?) selling replacement MB for the 2400,you had to send it in to be repaired which in many cases wasn't viable $ wise. 
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IanL-S

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Reply with quote  #7 
I have already replaced the Molex-SATA power connector and the SATA cable. There is no sign of damage on the mainboard (that I can see). The Molex connector shows no sign of damage. When I get a chance I will do a closer inspection. Other than the damage to the connector (see photo in first post) no signs of damage other than smoke scaring on the HDD support. There could be a wonky capacitor, but I did not look that closely at them.

Ian
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LegionX

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Reply with quote  #8 
If you have a multimeter, have you measured the pins on the Molex connector on the Main PCB to see if the 12V and 5V are there (and correct)? I have had it in the past where it cooks a voltage regulator on the main PCB when those crappy Power and Data SATA Cables went in to meltdown... When that happens one of the voltages will be missing, or low... I don't have a board to demonstrate with, but the components were in the bottom left corner (generally not that far from the connector) and you'd generally see a bubble or a hole in one if this had happened.... sometimes you can replace the part with one from a scrap board, otherwise you can rig in an external power supply for the HDD and only plug in the Data Cable to the motherboard... messy option but likely to work
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davidmorr

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Reply with quote  #9 
Ian, maybe this is your solution......

http://sendy.icetv.com.au/w/cZDONfUEo30zGuhcj5RvqQ/bh39n2ClObeXqZ7WS892IySQ/i6k9KnOpCm3hlDnfEHF69g

It does not seem to require the trade-in to be working. And if you have an old tiny disk, you can keep the current one.

Just cursing having disposed of my old 5000s.....
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davidmorr

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Reply with quote  #10 
Quote:
Originally Posted by IanL-S
Other than the damage to the connector (see photo in first post) no signs of damage other than smoke scaring on the HDD support. There could be a wonky capacitor, but I did not look that closely at them.
I had something similar happen on a laser printer. There was a burning electronics smell and I thought I would be up for a new printer. If I tried to print, it would register a fault. I would open and close the door of the toner area, and it would finish printing.

This was a nuisance but bearable until I could work out what to do. As is typical of the retired, procrastination rules, and after a couple of weeks, the fault stopped appearing and it works fine again now. I am wondering if it was an insect or something in the wrong place at the wrong time, and eventually its carcass burned away.
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IanL-S

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Reply with quote  #11 
I got the offer both via IceTV and Beyonwiz. I think I would rather trade in an ancient 2100 in the hope of resurrecting the 2470. Not sure I can justify the purchase of another Beyonwiz.

Ian
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AQUAR

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Reply with quote  #12 
Code:

the fault stopped appearing and it works fine again now

Sometimes a failed electrolytic capacitor goes through a self healing mechanism (and its not always permanent). Just one reason for a failed electronics device to start working again.

Electrolytic capacitors gone bad are a very common cause of power supply issues, hence the suggested first port of call (after measuring voltage levels of course!).


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davidmorr

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Reply with quote  #13 
Quote:
Originally Posted by AQUAR
[CODE]Sometimes a failed electrolytic capacitor goes through a self healing mechanism (and its not always permanent). Just one reason for a failed electronics device to start working again.
tbh, I have not been motivated enough to open up the printer to look. I tried to replace some mechanical components on a laser printer years ago, and even though I was successful in doing it, it never worked properly again. That was when I bought my current printer. There are just too many fine mechanical tolerances to go wrong.
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AQUAR

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Reply with quote  #14 
I've repaired my NEC silentwriter's ($3,000 bucks when I got it!) switch mode power supply a couple of times.
The feedback circuit (opto couplers!) and the bootstrap circuit (electrolytics) were the cultprit here.

The last time it failed I just gave up and bought a new colour laser printer for $127 bucks.
Todays electronics are mostly throw away on failure, except for DIY on some valued gear (like a toppy!) or really expensive stuff.

Was given a 2460 toppy that would just give the "scrambled service" message - used a pencil blow torch on it and so far its still working.
Without CCT diagrams for these toppies any DIY repair mostly comes down to simple and obvious issues (like burned sata data/power connectors and bulging capacitors).

I am sure if IanL-S fixes his PVR we will get the info on what was done.  

 

  
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