SilverC54me

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.

Gary

RB211

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,,,,

coletrickle35

Looks like a PITA . Unfortunately my HVAC is fading fast almost blacked out not looking forward to this one

3sACROWD

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.

The Rabbi

Use a toothpick in one hand to hold the resistor in place while using the other hand to hold the soldering iron.

Vetteman Jack

Good advice and nice job cleaning up the mess done by a previous owner.

FX VETTE

I used little cheap-o clamps from HF when I fixed mine. They held the tiny resistors in place while I soldered.

SilverC54me

Just for reference, here is a board that was not touched by anyone else.




And here is after re-soldering, just heating up the edges of the chips. A couple of them did need a bit of solder added.



Gary

coletrickle35

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

SilverC54me

The tip is a bit big but is usable for this. My soldering iron is about half that size.

Gary

Simtech

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.

DDaaryl

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.

UM Rebel

241 resistors are obsolete. Some of mine had fallen off the board and got lost. Had to do some substitution.

arthursc2

DO NOT USE LEAD FREE SOLDER

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

coletrickle35

Yes the soldering iron is haggard think I'll try and grind it down. Going to get rid of this solder and get some regular or leaded.

arthursc2

Thank you!

I am just trying to save you aggravation and money

coletrickle35

Ground down the tip it's like new now. Seriously appreciate the help

coletrickle35

Time to crack it open

coletrickle35

You got to be kidding me. Nobody said these things are the size of match heads!

SilverC54me

Unplug the connector from the board before you start working on this.

Gary