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Solved Faulty coolrunner chip - Falcon rgh1.2

Lucky

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I have been battling a Falcon mobo for the past two days now to no prevail doing a RGH1.2 using JRP & Coolrunner Revc.
Some prerequisite knowledge:
  • Obviously, coolrunner is a clone chip.
  • I semi know how to solder, I used to build small board for my work.

Here's my story of events-

Following the RGH1.2 guide on site as well as a youtube video.. I soldered all leads from my JRP onto the mobo. Then, plugged console in, ensured JRP switches were set to jtag (not xsvf? is this my problem), and not in the bootloader mode. I was able to get 2x nand dumps, which THANKFULLY i put onto a USB drive. Created a ECC, wrote ECC. Plug my coolrunner into the JRP, set JRP to xsvf mode & coolrunner to program, send the 12_21.xsvf file. Successfully sent.

Here's where I think things got iffy? I followed the youtube tutorial instead of the guide on site for this bit. Bridged JP, points 2&3, and CAP.
Proceed to wire in the coolrunner, and make some pretty decent solders - unfortunately no photos. Plug in the console, disconnect JRP. Press the disc tray button... Stuck glitching for 15-20 minutes... Decide to try a different timing file, well ALL the timing files I should say. This yielded no other result.
I did some googling and found it could be a corrupted nand, so I tried to find my back ups which I couldn't... I then found a tutorial on making a nand from scratch, which I followed. This also yielded no glitch into XeLL.

At this point, I switched my coolrunner from glitch to program mode to disable it.
That's when I stupidly looked over at my desk and realized I had the USB with the backup on it. Quickly grabbed it and reflashed the nand, which I got an RROD error of 0022. I couldn't find a definitive answer to how to fix this, other than my CPU may be a goner.... Then I found some thread that had one key point I missed - ensure JRP had "Retail" set when flashing the original nand back. I did this, and still RROD with a 0022 secondary error. I thought the board was a goner so I decided to desolder all my points to try to use my coolrunner on a different console. As I'm putting everything away for the night I decided to hit the power button one last time... The console booted to retail 17559 dashboard without a RROD error.

In summary,
Is my coolrunner essentially defective? Are there points I can meter out to test for shorts? With the price point, I'm going to just order a new one anyways and give it a go with a fresh coolrunner that I haven't bridged any points and possibly damaged something.
On the coolrunner I have at this moment, I used all the standard points for glitching (including the dreaded hana point on the top mobo), paired with every timing file I could find. *Im using Octal450 Octal450 's release of JRunner with extras, along with every alternate point and methods of wire routing I could think of.

This is not my first attempt at a glitch, but my second attempt - the first attempt on a jasper I hard-bricked. I lifted the hana point, and then the alternate point trying to bypass the surface mounted resistor. I wish I had taken photo's of my solder points before I pulled them, but if I took a guess maybe 2-3mm of exposed wire at each point with the smallest bits of solder connecting to each pad location. I would just barely tin the wire, hold the wire to the point, and apply heat with my iron. It held good, seemed to make good connection and didn't appear to be a cold joint.

This falcon has all pads intact, no pads appear burnt especially considering it boots retail up perfectly fine instantly.


Quick update - I sent some pictures over to Octal on discord showing all the pad points, we both are in agreeance they don’t look damaged. I have a new coolrunner chip coming in the mail that I will try to use for this falcon console and see what happens. I believe I damaged the coolrunner chip by bridging some connections I saw people bridge. I misunderstood a YouTube video and bridged the CAP point which seems to have rendered the chip useless to me currently. Will know more in few days time.
 
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Octal450

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Don't bridge CAP on Falcons. Show soldering pics, Falcons are forgiving, 9/10 times its solderings. Usually that can happen if RST or PLL get damaged.

You can check for console damage without pulling the chip, just put retail NANDs back.

Kind Regards,
Josh
 
Lucky

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Don't bridge CAP on Falcons. Show soldering pics, Falcons are forgiving, 9/10 times its solderings. Usually that can happen if RST or PLL get damaged.

You can check for console damage without pulling the chip, just put retail NANDs back.

Kind Regards,
Josh
I've already fully desoldered, unfortunately. It was the only way I was able to get retail without RROD. I know my post above isn't very clear, writing it half awake in all honesty. I can show pictures of the board how it sits now, with nothing attached. Thankfully no shorts exist, atleast none severe enough to brick the console from retail boots.

I will try again when a new coolrunner chip comes in (can get them pretty much 2nd day to my house for less than a meal). I will avoid bridging CAP entirely. I also think I may have corrupted the chip on the coolrunner so I want to rule that out entirely. At a point, mid upload I lost power to my house which in turn lost power to the coolrunner.
 
Octal450

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Show PLL and RST points please with as much flux cleaned as possible.

It could be the CR, did you try at all without the CAP? For RGH1.2, no changes have to be made to the chip (except on Jasper, you can add the CAP if it won't boot well).

Default is 2-3, JP, and no CAP.

Kind Regards,
Josh
 
Lucky

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Show PLL and RST points please with as much flux cleaned as possible.

It could be the CR, did you try at all without the CAP? For RGH1.2, no changes have to be made to the chip (except on Jasper, you can add the CAP if it won't boot well).

Default is 2-3, JP, and no CAP.

Kind Regards,
Josh
Let me grab some photos real quick of the points.

I bridged JP, 2&3, and CAP. I will avoid doing this on the next coolrunner I receive as that is the one thing I differentiated on in terms of tutorial from the site.
 
Octal450

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JP and 2-3 should be bridged by default with a 0 ohm resistor. You should be able to just install. Also confirm the switch is in FAT, or else the I/O standard for the RST and POST banks will be too high for the phats.

Kind Regards,
Josh
 
Lucky

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Octal was kind enough to give me tons of support over discord.
In short, I ordered a couple new coolrunners. The first one out of the package wouldn’t take programs sent from JRunner (defective xlink).
The second coolrunner managed to glitch the console properly. Though I believe the motherboard I glitched may have been an RROD repair console so the glitch wasn’t a perfect glitch. It still works and I’m stress testing it now.
As for the original coolrunner chip I used, I still have it. I have a couple more falcons on hand I will try it on and see if it works. But, for now it’s solved.

Over all, the falcon lived and is working. I will most likely keep it on a shelf as a keepsake item for the future. I managed to not burn up pads, and they took solder half decently on the second go around.
 
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