Hello everyone,
I`m struggling with two keys belonging to same car. Since I`m good with electronics, all friends come by asking me to fix this and that.. So I try to help everyone, but lately my time is limited (1 x 2-years-old + 1 x 2-weeks-old are more than enough
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Pardon me for asking, but right now I am in a dead end.. A friend of mine (obviously) has a car (I`m not sure whether I should post the car`s name here... not to be considered advertising or something.. but whatever, maybe there is a common problem with this brand name..): 2001 skoda octavia mk1 wagon... The problem is that both keys drain batteries in days.
I noticed however that the crystal oscillator had a very bad connection to one of its legs... The copper pad below the respective leg was totally missing (corroded or smth), but no trace of anything. The key circuit was not removed from its case (I had to heat the melted plastic pins holding the board against the buttons half). Still, someone would have had access to the PCB side holding all the chips (buttons are on the other side, original ones).
1. Batteries drain in days (no matter that it`s Duracel, Varta or dolalr-store type).
2. You can`t reverse-polarity the battery, the battery holders will simply connect to the same side.
3. Circuit does not have any traces of corosion/deposits.. Anyway, washed with isopropyl alcohol (99.9%) and no success.. I even removed and reseated the chips, same problem..
4. Connected a 300ma power source, saturated board with isopropyl and the isopropyl alcohol on both chips starts to evaporate... not a good sign...
5. 1 corroded oscillator pad, no traces of anything..
Note: The transponder is a glass-sealed capsule, not part of this circuit. This circuit only servers locking/unlocking doors (no trunk, only 2 buttons).
Do I stand any chance of making this car remote work? How about the second one?...