HU-850 radio fault

PeterGrainger · Jul 12th, 2018, 16:51

I have recently bought a 2006 V70 which has a fault on the radio. I understand that this is common with this model. Can anyone advise me what the fault is and how it can be fixed so I can find a repairer and give him/her an intelligent idea of what the problem is?

CTCNetwork · Jul 12th, 2018, 17:27

Hi,

Moving to the correct forum. Have a search withing this forum too as if a common problem there will be common answers.

Des. . .

Herman the German · Jul 12th, 2018, 18:32

What's the fault? Is it with the radio or the CD player? From memory, these were made by Mitsubishi.

SwissXC90 · Jul 12th, 2018, 19:32

Quote:

Originally Posted by PeterGrainger

I have recently bought a 2006 V70 which has a fault on the radio. I understand that this is common with this model. Can anyone advise me what the fault is and how it can be fixed so I can find a repairer and give him/her an intelligent idea of what the problem is?

Without having any description of the fault whatsoever from your side i'm going to guess what it is:

You have a failled illumination bulb

Remove the radio, and replace the failled bulb with a new one
Problem fixed!

Did i guess right?

If not, how about providing a few clues as to what your problem is....

PeterGrainger · Jul 14th, 2018, 13:00

Sorry for the delay - I have "man-flu" and may die at any moment.
I turn the radio on and the display lights up. Channel search works and all buttons function but no sound happens for a couple of minutes then the radio comes on for a brief blast only, sometimes. Sometimes nothing happens at all.
The tape player mechanism works fine but the only sound I get is regular light clicks.
I have a Parrot fitted which seems to work but the sound is faint.

PeterGrainger · Jul 14th, 2018, 13:04

CTCNetwork you suggest wrong forum - please advise which one to use. Thanks

PeterGrainger · Jul 24th, 2018, 15:58

Having read the correspondence this item has generated I believe I could have been clearer so here is more detail:

I turn on the radio and the display lights up as normal. All the functions work but there is no sound at first. After a couple of minutes the radio comes on but only for a minute. The only sound is a regular clicking then nothing again. If I leave it on for a further ten minutes or so, the radio comes on at full volume and will not respond to any of the buttons. I have to turn the radio off to kill the row. Turning it on again repeats all of the above.

The CD functions normally except it has no sound.

My model has the amp under the drivers seat

It seems to me that the problem is to do with the amp.

Can anyone give me any pointers? If this is repairable I will need help from someone in the vicinity of HP4. Do you exist?

Thanks in advance

ma70 · Jul 24th, 2018, 22:41

Not the amp, it's the head unit itself. I'm currently working on ours & having reflowed a few joints with semi-success I'm now in the process of sourcing/replacing a pair of transistors and a voltage regulator which I believe to be the cause of this problem.

The affected area of the board is next to the tuner can & the parts I suspect are Q938/Q939 and IC945 (D1760Q transistors and an ST LF33A 3.3v regulator respectively, all in a DPAK package).

These parts are available cheaply off ebay & even with my inappropriate soldering gear I hope to make a repair.

Even if you can't/wont go into the stereo yourself, at least you could advise any repairer what the problem is likely to be.

jnmonaghan · Jul 24th, 2018, 23:07

I have on my file of useful contacts a repairer of Volvo car radios--
-- Central Services
in Essex, CO11 1UN
email:- enquiries@centralservicescaraudio.co.uk
Tele :- 0126 396272

Hope this helps. Jude

ronmanager · Jul 25th, 2018, 11:44

I had mine done last year by Central Services - details are in this thread but it cost £220 odd for them to repair - there was no other alternative anywhere near the price. They do loads of them for this reason but they were quick and the repair sorted it.

https://www.volvoforums.org.uk/showt...=273220&page=2

Jul 12th, 2018, 16:51	#1
PeterGrainger New Member Last Online: Jul 30th, 2018 17:35 Join Date: Apr 2018 Location: Berkhamsted	HU-850 radio fault I have recently bought a 2006 V70 which has a fault on the radio. I understand that this is common with this model. Can anyone advise me what the fault is and how it can be fixed so I can find a repairer and give him/her an intelligent idea of what the problem is?

Jul 12th, 2018, 17:27	#2
CTCNetwork Forum Support Team Join Date: Dec 2004 Location: Liège, Belgium View Photos By: CTCNetwork	Hi, Moving to the correct forum. Have a search withing this forum too as if a common problem there will be common answers. Des. . . __________________ Density:- Not just a measurement ~ It's a whole way of Life.! ! ! I drive a Volvo, Please Don't Get In My Way! OldVolvos4Ever He shows up. People die. He vanishes. People should not be afraid of their governments. "He'll deliver more justice in a weekend than 10 years of your Governments should be afraid of their people... "V" courts & tribunals. Just stay out of his way." "I plan to."

Jul 24th, 2018, 15:58	#7
PeterGrainger New Member Last Online: Jul 30th, 2018 17:35 Join Date: Apr 2018 Location: Berkhamsted	HU-850 radio not working Having read the correspondence this item has generated I believe I could have been clearer so here is more detail: I turn on the radio and the display lights up as normal. All the functions work but there is no sound at first. After a couple of minutes the radio comes on but only for a minute. The only sound is a regular clicking then nothing again. If I leave it on for a further ten minutes or so, the radio comes on at full volume and will not respond to any of the buttons. I have to turn the radio off to kill the row. Turning it on again repeats all of the above. The CD functions normally except it has no sound. My model has the amp under the drivers seat It seems to me that the problem is to do with the amp. Can anyone give me any pointers? If this is repairable I will need help from someone in the vicinity of HP4. Do you exist? Thanks in advance

Jul 24th, 2018, 22:41	#8
ma70 Curmudgeon with a turbo Last Online: Jul 1st, 2020 17:48 Join Date: Nov 2014 Location: Congleton	Not the amp, it's the head unit itself. I'm currently working on ours & having reflowed a few joints with semi-success I'm now in the process of sourcing/replacing a pair of transistors and a voltage regulator which I believe to be the cause of this problem. The affected area of the board is next to the tuner can & the parts I suspect are Q938/Q939 and IC945 (D1760Q transistors and an ST LF33A 3.3v regulator respectively, all in a DPAK package). These parts are available cheaply off ebay & even with my inappropriate soldering gear I hope to make a repair. Even if you can't/wont go into the stereo yourself, at least you could advise any repairer what the problem is likely to be. __________________ (current) '06 P2 S80 D5 SE LUX, Met. Gold/Black leather, 200k (past)'99 P1.5 V40 SE 1.8 (1731cc), Metallic Peacock Blue-Green, Black Leather, Winter Pack. 101k (past) '88 340 GL 1.7, gifted to me with "slipping clutch" that was a sticky linkage

Jul 24th, 2018, 23:07	#9
jnmonaghan Senior Member Last Online: Yesterday 23:40 Join Date: Mar 2011 Location: Belfast	Volvo Radio Repair I have on my file of useful contacts a repairer of Volvo car radios-- -- Central Services in Essex, CO11 1UN email:- enquiries@centralservicescaraudio.co.uk Tele :- 0126 396272 Hope this helps. Jude

Jul 12th, 2018, 18:32	#3
Herman the German New Member Last Online: Apr 1st, 2019 13:31 Join Date: Jul 2018 Location: Glasgow	What's the fault? Is it with the radio or the CD player? From memory, these were made by Mitsubishi.

Jul 14th, 2018, 13:00	#5
PeterGrainger New Member Last Online: Jul 30th, 2018 17:35 Join Date: Apr 2018 Location: Berkhamsted	Sorry for the delay - I have "man-flu" and may die at any moment. I turn the radio on and the display lights up. Channel search works and all buttons function but no sound happens for a couple of minutes then the radio comes on for a brief blast only, sometimes. Sometimes nothing happens at all. The tape player mechanism works fine but the only sound I get is regular light clicks. I have a Parrot fitted which seems to work but the sound is faint.

Jul 14th, 2018, 13:04	#6
PeterGrainger New Member Last Online: Jul 30th, 2018 17:35 Join Date: Apr 2018 Location: Berkhamsted	CTCNetwork you suggest wrong forum - please advise which one to use. Thanks

Jul 25th, 2018, 11:44	#10
ronmanager Member Last Online: Jul 22nd, 2023 15:43 Join Date: Sep 2010 Location: Catford	I had mine done last year by Central Services - details are in this thread but it cost £220 odd for them to repair - there was no other alternative anywhere near the price. They do loads of them for this reason but they were quick and the repair sorted it. https://www.volvoforums.org.uk/showt...=273220&page=2 __________________ 2016 XC70 D5 LUX

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