EricHiggin said:
Alright no problem. Based on your explanation that you can solder and use a meter I figured it might be worth a shot.
You actually wouldn't be shorting out the power supply per se, and the short amount of time you would be making the connection to verify, wouldn't really hurt anything. Keeping the jumpers on for a very long period of time would eventually do damage, but we're talking a long time.
Have you tried looking up the more specfic secondary codes ?
Secondary error codes
An Xbox 360 with three flashing red lights will not power on, so the error message must be obtained by an alternate method.
Obtaining secondary error codes
Power the console on so the three red lights are flashing. While holding the sync button on the front of the console, press and release the disc eject button. The lights will begin flashing in a different pattern. The number of flashing lights in this new pattern determines the first digit of the secondary error code, ranging from 0-3, with all four lights flashing indicating a 0. Continue to hold the sync button, and press and release the eject button three more times to obtain the second, third, and fourth digits of the secondary error code in the same method. Pressing the eject button a fifth time should return the flashing lights to the original Red Ring of Death pattern. You have now obtained your 4-digit secondary error code.
Corresponding error codes
To determine which error message corresponds to your secondary error code, use the error code database provided by Xbox-Experts.
https://xbox-experts.com/errorcodes.php
My brothers code was (E01) 0001 - short circuit in the console/faulty psu. Some of the codes are very specific so its might help you more than just guessing. It may also help the shop you take it to depending on how familiar they are with 360's.
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