There is some fight going on amongst the taxi drivers about airport pick-ups and no taxi will pickup in San Josep.
Last 3 days I've been late to work and had to take an uber at triple the cost because no taxi will accept a pickup in San Josep.
It's disgraceful.
Editing to shorten in the hopes someone will actually read it.
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The amp from my 2003 Lexus was working but had leaking caps so I decided to replace the big ones.
One of the pads lifted on one of the 10 filter caps. I mistakenly assumed the lifted pad connected to the visible ground plane like the two identical capacitors beside it so I added a bodge wire. But I was wrong as it turns out it actually connects to a different internal plane.
When I powered it on it blew the car's fuse. Then I found and fixed the capacitor mistake.
When I powered it on again it was working but stinky, turns out one of the power MOSFETs blew. I guess it had already failed internally when I powered it on the first time.
How to proceed? Should I check/replace any parts other than the blown MOSFET?
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Found 2 bulged/leaked power supply capacitors in the Mark Levinson amp in my 2003 Lexus so I undertook replacing all the big ones (4x 16v 4700uf, 10x 50v 1200uf). Got Nichicon UHW I was so excited.
Had a hard time desoldering the caps, tried my desoldering gun and it lifted the pad. So I scratched off the solder mask beside it and connected it to the ground (?) plane like the ones beside it. (Pic 2) Turns out half of these (filtering?) caps don't actually connect to this plane so when I plugged it in it it played a high pitched noise for about 10 sec before blowing the car's fuse.
I replaced the fuse and disconnected that capacitor from that plane, added a jumper to nearby capacitor sharing the correct plane in case the connection within PCB was weak (since it's missing it's pad). (Pic 3) Plugged it in again and it was working but I turned it off after about 30 sec because smelled burning.
This time one of the power MOSFETs blew. (Pic 1) I guess it had failed internally from the first fail? When I was correcting my mistake I saw 12ohm across the power capacitors, after blowing and removing the MOSFET it is much higher.
I am making this post to ask how would you proceed? Obviously I need to replace this MOSFET, should I replace the other 3 as well? (Pic 4 shows more of the amp; failed MOSFET is second in the left group of 4. I think those 4 and the 4 caps below them are part of the power supply circuit?) Any other parts?
Thanks in advance. This could have been avoided if I hadn't rushed it, I should have known better. Should have more carefully checked if it actually connects to that plane. Could have also caught it if I had measured resistance across the capacitors (it was 0 due to the wrong connection). Learn from my mistake and take things slow!
Unrelated questions:
I later found a small capacitor has leaked too. (Pic 5) I guess I need to replace these too? There are 16 of this size on the board.
Some of the nasty juice seems to have crept under the conformal coating and begun corroding small parts. (Pic 6) Worth removing coating and cleaning? How to remove coating? Should I reinstall a coating?
Now I wonder about the rest of the electronics in the car...