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Home / I-Opener Areas / I-Opener Technical Stuff Help: Replacing Q16 & Cooling resistor mod Help: Replacing Q16 & Cooling resistor mod

Help: Replacing Q16 & Cooling resistor mod (modified 0 times) Spacestr Profile I have recently desided to add the Cooling Resistor to my Q16 to help the cooling and stabilize the IOpener at 300Mhz or more. Unfortunately when I was adding the cooling resistor (that i bought from badflash), I snapped the original Q16. So I ordered a replacement Q16 from badflash. I was unable to remove the original Q16 from the location, but I took its legs off of the pads. I then used wires to run to the new Q16 and the cooling resistor. Now, the situation is, when I turn on the IOpener, a few seconds later the new Q16 heats up SO MUCH, that the solder I used to connect the wires to the chip, melts, effectively unsoldering all my wires :( Now, I need you guys to help me. 1. I think I need to remove the original Q16 completely, but how do I get it off of the board? It just seems to be stuck no matter how much i heat up the base of it. 2. Why would the new Q16 heat up so much? 3. Has anyone else done this mod and have suggestions? Thanks in advance! 05-25-2002 08:52:36

RE:Help: Replacing Q16 & Cooling resistor mod (modified 0 times) Glitch Profile Spacestr: Q16 (as well as many of the other chips) uses the circuit board as a heat sink. Even if it is not directly connected (electrically), the heat will migrate to the ground and power planes and dissipate. When the chip is "in the air" the heat generated has nowhere to go. I've removed Q16's before and there is no magic to it. If you are using a regular soldering iron, remove the legs first. It sounds like you have already done this. The next step is to make sure that you have good heat transfer to the "big connection". Wet the soldering iron with solder to have good heat transfer. A 15w soldering iron may not provide enough heat. I would use at least a 40w iron. HTH. Glitch Electronics run on smoke, if you let the smoke out they won't work 05-25-2002 09:20:08

RE:Help: Replacing Q16 & Cooling resistor mod (modified 0 times) Spacestr Profile I thank you from the bottom of my heart, Glitch. I did as you told me, and now my IOpener runs stable at 400MHz :) I have one question that came up after this mod. Why does the cooling resistor stay cold and the Q16 still burning hot? (mbm reports it as 65C) In any case, thanks again! 05-25-2002 12:35:39

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