Retimer replacement

I am very much a noob when it comes to smd soldering, and I’ve chosen the wrong job to improve my skills… Still, I haven’t damaged any pads or blew off any other components, and there’s no visible damage to the board. I’ve had a lot of trouble getting the right amount of solder onto the pads to form good connections, so my replacement IC has been heated up an embarrassing amount of times, a lot of no clean flux has solidified on surrounding areas as a result. On the latest two attempts I’ve been getting what seemed to me as a satisfactory connections on the properly aligned IC… but still no signal.

Xbox works over LAN, the filters after the retimer seem to be fine, I get the 5v on pin 18. The HDMI port itself seems to be in good condition.

I’m thinking I might have too much solder now and the pins are bridging to ground OR I burnt the IC by heating it numerious times for extended periods… I’m waiting on extras on Monday but is there anything else I should look out for? There aren’t really that many parts in the circuit; are there any other common failure points ? I’m also worried I might’ve damaged C43 or C50 with all the heat…

I haven’t bothered to clean up the solidified flux, I can heat it up and scrape it off with something non-metallic, some isopropyl, etc… can it cause any issues? It’s chipquick smd291 no clean flux… and I’m pushing my station to it’s 480F limit…

Hey there,
usually, leaving flux on the board for prolonged periods is not too good. I don’t know about your ChipQuik, but flux might be lightly conductive, might cause corrosion or simply keep gunk on or between your contacts, causing problems. I always try to remove it as fast as possible after soldering.

My guess is that you’ve probably caused the retimer to go bad by heating it that much. I’d remove it and clean the area all up then install a replacement once you get the new ones. Keep in mind that a faulty hard drive can also cause the no display issue.
Also, make sure there are no shorts to ground on the circuit traces around that little silver BGA chip on the lower left of the HDMI port.

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Happy to report that a new chip fixed it. Im going to clean up my flux mess before putting everything back together .

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Great news! Congrats.

Where did you find a retimer chip?

Digikey

I’ve since randomly found a used one X with a faulty chip and fixed it, didn’t burn any chips this time. 1/2 price 1X :smiley: It was definitely dumb to do mine on my first attempt at qfn / smd soldering but I really didn’t have anything similar to practice on and I was clearly too impatient to wait until I found something.

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That’s awesome! Nice work!