Member Since: 12 Feb 2024
Location: Aberdeenshire
Posts: 5
6 CD head unit fault coffee spill on PCB sourcing components
A coffee spill on the top of the center console seems to have caused the cd player to stop working, i.e. there is no sign of power to the cd function although the radio still works. I dismantled the cd head unit and checked the notched cd carriers and all are fine. The only obvious issue is there are multiple coffee stains/hardened lumps on the PCB boards and what appears to be a damaged transistor & capacitor as shown in pics. I want to give it a go at replacing these PCB components myself and have sourced the capacitor (nichicon, 100microF, 10V) but can't source transistor (stamped on it is BA00AS 83 49).
- does anyone know where to source this transistor/regulator?
- has anyone had a similar problem/fault and repaired the main PCB?
Thanks
Click image to enlarge
Click image to enlarge
Click image to enlarge
12th Feb 2024 10:24 pm
HairyFool
Member Since: 04 Jan 2023
Location: North Essex
Posts: 676
The 1st thing I would do is wash the PCB in water with a tiny drop of washing up liquid
Then rinse with clean water but if you live in a hard water area use distilled ( I used to use rainwater). Dry with a hairdryer but finish with an hour in an oven at 60-80°
The BA00AS is actually a voltage regulator so will not test out as a transistor.A visitor from the dark side, my other vehicle is an is still an EV. Strictly speaking its SWMBO.
12th Feb 2024 11:39 pm
kirk05
Member Since: 12 Feb 2024
Location: Aberdeenshire
Posts: 5
Thanks, i've worked over all the hardened coffee & stains now with cotton bud and white spirit and all have lifted nicely i think.
Could hardened coffee etc cause components like the capacitors & voltage regs to fail to work the way the should?...do you think a coffee liquid spill could blow components on the PCB?
cheers
13th Feb 2024 11:43 am
ronald.soak
Member Since: 29 Apr 2008
Location: London
Posts: 533
Nikko Electronics, Ewell. See eBay.
Seller has 2 listings, different prices, different P&P. Total around £7.50
Chinese copies available on Amazon, 5? for £3.27 +?
John
13th Feb 2024 12:04 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10676
I guess you could plug the radio in.
Maybe Start the engine or turn the radio on.
Get a DVM set to volts. Put the black cable on a good earth (cigar lighter surround).
With the red lead probe the pins on that regulator.
I would expect one pin to have the car voltage on. 14v? ish (if engine running)
Another pin should have something lower? maybe 12v 5v ? Hairyfool maybe able to give pointers?
May give some clues as to whether you are on the right lines.
13th Feb 2024 12:06 pm
ronald.soak
Member Since: 29 Apr 2008
Location: London
Posts: 533
kirk05 wrote:
Thanks, i've worked over all the hardened coffee & stains now with cotton bud and white spirit and all have lifted nicely i think.
Could hardened coffee etc cause components like the capacitors & voltage regs to fail to work the way the should?...do you think a coffee liquid spill could blow components on the PCB?
cheers
If the coffee was hot it might have pushed the regulator over it's thermal rating and that in turn could have taken the capacitor, (and unfortunately other components), out. The capacitor would mostly likely fail short circuit and add to the stress on the regulator.
Alternatively coffee, wet or baked, is probably conductive and have altered the circuit parameters.
It's possible that the regulator is Ok.
I'd press on and change the capacitor and regulator as you plan.
Good luck
John
Good luck John.
13th Feb 2024 12:23 pm
ronald.soak
Member Since: 29 Apr 2008
Location: London
Posts: 533
I now see that the regulator has both over current and thermal shutdown protection so it should have survived.
The output voltage is set by external components and could have been altered temporarily by the conductivity of the coffee.
Pete K's approach has merit. With the pins facing you they are numbered 1 to 5 from the left.
The input ( battery) voltage should be on pin 2 , and the output voltage on pin 4.
The centre pin 3 is the ground 0 volts.
If there is no output from pin 4 you could check pin 1 which is an on/off control, my guess being that 0 volts will be off.
John
13th Feb 2024 1:04 pm
HairyFool
Member Since: 04 Jan 2023
Location: North Essex
Posts: 676
It is more the wetness rather than the coffe/sugar that would that would have been the problem, even then electronic components of this age are waterproof so its the disruption of the circuit that would kill it.
Now if it had been Coke that is diffent, the board would be scrap. Works like paint stripper on copper.A visitor from the dark side, my other vehicle is an is still an EV. Strictly speaking its SWMBO.
13th Feb 2024 1:13 pm
kirk05
Member Since: 12 Feb 2024
Location: Aberdeenshire
Posts: 5
Thanks all for the pointers and knowledge...i took it all apart, cleaned up all the coffee gunge blobs. The first time i put it all back into the disco the small green display didn't light up, so eventually i took it all out again to better seat the ribbon cables in 3 places then when put back in the lcd panel lit up but no joy with getting it to function or respond to pressing any of the buttons so now am on the hunt for a salvage unit and will replace it entirely. Thanks again cheers
5th Mar 2024 5:20 pm
KPTV8
Member Since: 05 Feb 2012
Location: Itinerant !! (Scotland/Donegal)
Posts: 187
Hi, wish I'd seen this earlier.
A VERY GOOD solvent / cleaning agent is isopropyl alcohol.
Provided power is off you can pretty much slosh it around, work it into corners/grooves with a gentle toothbrush or cotton buds.
It's a very good solvent so MOST contaminants can be washed-out - water-soluble (coffee) and oil-based (cooking fats).
Wonderful thing is it evaporates quickly leaving everything dry after couple of hours, esp. if left somewhere warm.
Use it in a vented place, fumes are not dangerous but can leave you a bit "heady", and it's REALLY flammable.
I once dropped a Blackberry into pint of Guinness - totally immersed, all recesses soaked. Had it back working 24 hours later using this stuff.
5th Mar 2024 8:07 pm
kirk05
Member Since: 12 Feb 2024
Location: Aberdeenshire
Posts: 5
Thanks John & PeteK i was getting 14.3V on pin 1 or 5 and at the other side was getting 7.3V on pin 5 or 1...BUT, being an eager novice, the probe slipped and caused a spark then everything went dead ><) ...luckily after removing the head and cables all was ok just without the head unit.
The head i've got is part no. VUX500560 which is proving v difficult to source (used)...there are plenty around that are VUX500330 or VUX500300, would anyone know what the difference is between these models?
Thanks again
6th Mar 2024 10:47 am
kirk05
Member Since: 12 Feb 2024
Location: Aberdeenshire
Posts: 5
Thanks KPTV8 i've (novice) unfortunately shorted the pcb testing voltages...am searching out differences now between the head unit models VUX500560 and VUX500330
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