BA Falcon Interior Command Centre No Power Repaired
A customer brought this Interior Command Centre into my lab for repair. He had purchased it from a vehicle wrecking yard, but it did not work.
This unit not only controls the audio system of the vehicle, but also the HVAC (Heating, ventilation, and air conditioning, interior lighting as well as part of the immobiliser system of the vehicle. He’s a busy guy! It is also on the CAN network, which communicates with other modules on the BUS.
Firstly, after examining the wiring diagram, I determined that to power-up the unit, supply voltage must be supplied to pins 7, 8, & 35. A ground supply needed to be supplied to pins 18 & 15.
After connecting to my bench power supply, the customer’s complaint was confirmed – the unit would not power-up.
Now it was time to disassemble the unit. All external covers had to be removed as well as a large number of screws holding them in place.
The CD section of the unit needed to be separated from the power supply and ribbon cables had to be carefully removed.
Once the power supply was isolated, the circuit board was removed by twisting several ‘tabs’ holding it in place. This was done by twisting the metal with pliers.
Now that the circuit board was clearly exposed, I placed it under the digital microscope. Circles could be seen around most through hole joints, indicating ‘dry solder joints’.
As I worked my way around the board, the main fault became obvious. The B+ main power feed had clearly had some sort of high current at some point. The solder had melted and the terminal had no contact with the board. The more I looked, the more solder joints I found needing attention.
The only solution for a long term repair was to solder every through hole component. By careful use of flux, solder and correct amount of heat, I felt confident of the repair.
Cleaning up any remnants of flux with Isopropyl Alcohol, a toothbrush and paper towel, created a quality repair.
After reassembly, power was once again supplied to the unit and the display came up on the screen.
After installation to the vehicle, simple programming matched the specific security code to the vehicle.
If you are interested in this repair, you can see a video on my channel following the link below:
This article was prepared for you by Mark Rabone from Australia.
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Note: You can check out his previous repair article on Yamaha RX797 AMP Repair