2013 HoldenCaptiva LX diesel
Hi I am interested to know if the multimedia unit in the Captiva (mine is the Holden 2013, Diesel model) has a system back-up battery. Like that of a computer motherboard. Every time I have reset the time and date in the WindowsCE user interface it immediately reverts back to the default in Jan 1999.Hi all, I guess first up hello to everyone out there! I am a mechanic from Australia, I also specialise in ecu, module and various electronic repairs as a bit of a side line.
Well anyway rewind a couple of days, I (maybe stupidly ha) bought a 2011 captiva LX, 2.2 diesel. I soon realised during the 300+km drive too get the car home that the multimedia screen is as dead as a dodo. It was rebooting, touchscreen wasn't working, and resetting the unit resulted in it powering up, sometimes freezing at the boot logo, other-times allowing me too view DTE, average fuel consumption, heater settings etc. No other functions were usable due too no touch screen.
The reason I registered this account is because this may help others out there.
I spent hours trawling the net and found that its common to fail, its a ripoff too replace, and no account of anyone successfully repairing this unit, various theories as too the cause, but all speculation.
This is the REAL cause of the trouble. I repaired my unit and it is now perfect!!!
The problem is indeed related too the processor, but it is NOT faulty. It does NOT overheat (it only draws 1w, very low power, made by AMD, designed too operate with no heatsink, more on this shortly)
The CPU is a BGA mounted chip. Basically this means there are a few hundred soldered connections on its underside, each one originally starts as a tiny ball of solder. Now in basic terms, it is then heated too reflow temperature during manufacture which melts every little solder ball forming a connection between the cpu and the board. They then (stupidly, repair sucks, and a possible contributing factor to failure) injected an epoxy adhesive under it too prevent movement/vibration causing an issue.
What is happening is some of these soldered connections near the center of the chip are failing, this is a result of inferior lead-free solder and thermal expansion differences between the printed circuit board and the chip.
The unit obviously due too location experiences a wide fluctuation in temps due too location (sun), also likely from heater etc. Over time the board repeatedly flexes slightly under the chip and some of the solder joints fail.
It is rather likely they used the incorrect PCB material/solder composition/and PCB layout for the purpose. IE. a monumental stuff up.
A heatsink on the chip will NOT prevent this failure, it may however prolong its life, by how much is akin to the length of a piece of string.
Its rather common. Think xbox RROD, ps3 failure etc. When you have BGA components, especially large ones like CPUS, design and materials is critical as well as stress testing and xray analysis
I repaired my unit by carefully removing the CPU (lots and lots of swearing), Cleaning everything up, Re-balling the chip with slightly flexible LEADED solder, preheating the whole pcb too 150degC and resoldering the chip.
All functions are working again, touchscreen is great, powers up everytime, etc etc.
I really hope this post helps others out there, there would be a few companies out there who have the facilities too work with BGA in every part of the world. Ask them too re-ball the CPU and problem fixed
I expect the success rate would be around 70percent. Some will be unsuccessful due too damage removing the chip.
It likely will fail again(bad design) but it will last a few years longer than a new unit.
If there was enough interest I could potentially offer a repair service here in AUS, the cost being likely around 200aud + post.