[Chrismmoore]

My radio has suffered from the no sound except 5 second full volume bursts whether radio switched on or not. I've dismantled the radio to look for dry joints but couldn't find any. But the main circuit board looks burnt/overheated in one area. I purchased a second hand HU 803 unit (£35) that works fine but doesn't secure into the vacant location nor does the aluminium effect trim attach back on.
As the cheapest second hand HU 850 is £150 + p&p and also the HU 803 doesn't drive the remote volume and channel controls (backlights work fine) nor the reversing sensors; I'm wondering can I swap the main circuit board from the HU 803 into the HU 850 and every thing will work??