HU850 in '05 V70/D5 acting up... - Page 3

Stellaman94 · Aug 10th, 2020, 12:33

Same issue here, I read somewhere on the forums there's a chip that knackers itself on the circuit board and resoldering it can repair it.

Christerart · Aug 20th, 2020, 22:47

The HU850 in my 2005 XC70 has been acting up for a couple of months.

Sometimes I get in the car, start the car up and it works fine - sometimes it takes several minutes before it suddenly works - and then everything works (perhaps not the CD - not using it so have never tried it).

I've noticed that when it's warm it's liable to work, when it's cold outside (and in the car), that's when it sometimes doesn't work when I start the car but so far (knock on wood) it always works after a couple of minutes.

Once it does that I can turn the car or radio off (for a couple of hours) and when I start the car again or turn on the radio it always works.

I suspect a dry or cracked solder joint and when the radio gets warm, that expands enough to make good contact.

Getting to the point where I am looking for a Double DIN replacement but with installation, that's looking at £300+ and I'll only do that if I can re-install the original radio if I decide to sell it.

Which I am not looking at - had it for two years, paid silly money and it's been running like a proverbial Swiss watch and looks like new inside and out.

Another reason why I haven't is I can't find an installer where I live (Cambridge area) apart for Halfords and I'm not inclined to go there.

nickds1 · Dec 16th, 2022, 18:10

Just to let folk know. I've fixed this - eventually just got fed up, stripped the unit down, did some diagnostics and replaced some bits including adding a small heatsink to the power regulators. Re-assembled.

HU-850 working a treat again now!

john493 · Jan 4th, 2023, 20:28

Quote:

Originally Posted by nickds1

Just to let folk know. I've fixed this - eventually just got fed up, stripped the unit down, did some diagnostics and replaced some bits including adding a small heatsink to the power regulators. Re-assembled.

HU-850 working a treat again now!

Hi Nick what were the fault symptoms ? My HU850 just the FM stops working intermittently. CD player still works, bluetooth via the CD changer port still works too. So as others have posted, looks like the output stages are still working. I've already re-soldered the 1 ohm resistors below the two power transistors (2SD1760).

MisterGee19 · Jan 5th, 2023, 20:16

Next step - if anyone ever figures out how to get HU850 lighting working again would be on to a winner!

Aug 20th, 2020, 22:47	#22
Christerart VOC Member Last Online: Aug 27th, 2022 09:57 Join Date: Jan 2013 Location: Cambridge	The HU850 in my 2005 XC70 has been acting up for a couple of months. Sometimes I get in the car, start the car up and it works fine - sometimes it takes several minutes before it suddenly works - and then everything works (perhaps not the CD - not using it so have never tried it). I've noticed that when it's warm it's liable to work, when it's cold outside (and in the car), that's when it sometimes doesn't work when I start the car but so far (knock on wood) it always works after a couple of minutes. Once it does that I can turn the car or radio off (for a couple of hours) and when I start the car again or turn on the radio it always works. I suspect a dry or cracked solder joint and when the radio gets warm, that expands enough to make good contact. Getting to the point where I am looking for a Double DIN replacement but with installation, that's looking at £300+ and I'll only do that if I can re-install the original radio if I decide to sell it. Which I am not looking at - had it for two years, paid silly money and it's been running like a proverbial Swiss watch and looks like new inside and out. Another reason why I haven't is I can't find an installer where I live (Cambridge area) apart for Halfords and I'm not inclined to go there. __________________ 2008 XC70 D5 Lux Geartronic Polestar, 161K 2005 XC70 D5 SE Geartronic, 203K

Aug 10th, 2020, 12:33	#21
Stellaman94 Junior Member Last Online: Mar 2nd, 2022 20:08 Join Date: Jul 2020 Location: Bedford	Same issue here, I read somewhere on the forums there's a chip that knackers itself on the circuit board and resoldering it can repair it.

Jan 5th, 2023, 20:16	#25
MisterGee19 Member Last Online: Mar 26th, 2024 21:43 Join Date: Sep 2019 Location: manchester	Next step - if anyone ever figures out how to get HU850 lighting working again would be on to a winner!

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