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I have been repairing the dual zone HVAC controllers for friends over the last 12 years or so. Just did one for a guy that a previous owner did a bad DIY repair on. This person globed the solder on top of the 241 resistors. I had to do some trace repair/bypass to compensate for damage.
Before cleaning and repair.
After cleaning and repair.
If you have never soldered delicate electronics before, please take it to someone that has.
Just did this last weekend to mine. Thank god I have been soldering things for years and knew I could handle the resistors and the lights.... Solder paste in a needle syringe is awesome for this!!
Not something I really want to do again, but I'm sure I'll be fixing my dad's '03 when the display and lights go TU,,,,
Looks like a PITA . Unfortunately my HVAC is fading fast almost blacked out not looking forward to this one
It isn't that bad of a job. Just take your time. When I did mine, I had a helper stabilize the resistor while I heated the solder to re wet the connection. (My hands aren't very steady at times. Having a helper allowed me to focus on the soldering iron) There was enough solder on the board so I didn't add more. The repair has lasted for the last 100k miles.
Picked up the smallest solder I could find Hopefully this soldering iron is good enough that's a Torx T20 next to it
getting ready to take it on probably going to do ebcm at the same time
I'm lucky to have a hi end solder station at work that I can use for projects like this. You can always file that tip down to make it sharper. Also the lead free solder is harder to work with. If you are concerned about the lead wear gloves. Good Luck.
Just did my 2002 this month with no problems. Not the prettiest job but it worked and no one can see it after installation. Lots of U Tube videos available for reference.
Get some rosin core 63/37 from Digikey or your local electronics house. Lead free needs too much heat, and youre going to have a very hard time, and may even make things worse. The boards were not soldered lead free OE and mixing lead free and leaded is a major no-no.
And clean that soldering iron tip. That thing is haggered
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HVAC Dim Display repair
