[typos1]

Are you sure its not just the brightness turned down to its lowest level and/or the the same level for day and night ?

I gotta spare screen for a Nav+, if you send me your unit I ll fit it for you for far less than the cost of a new HU.

This will give you iPod connectivity (plus SD card socket, aux in and USB in) :

http://www.ebay.co.uk/itm/110855191...sid=p3984.m1423.l2649&clk_rvr_id=502697663426

New screen and the Yatour unit would cost only a little more than all the kit you need to for a new HU, let alone the cost of the new unit.

 

[typos1]

Your 156 system is totally different form the 147/GT system, different software, different hardware.

The 156 one was designed in the mid 90s, the 147/GT was one designed in the late 90s, they were both quite advanced when they came out, but things have moved on.

You can listen to music if you have a cd changer/virtual cd changer.

 

[typos1]

The 159 one is different to the 147 one - the 147/GT one was developed in the late 90s, the 159 one was developed in the early 2000s, so its gonna be better. So, your 147 one is NOT "only 1 year younger than the 147" - the 147 was launched in 2000, the 159 in 2005 - the 159 is 5 years younger.

As I said in my earlier post - your screen is either broken or youve got the screen brightness settings on low. The music should mute when nav instructions are spoken, if they dont then you probably need a software update - if youre running it on the same software it left the factory with then its deffo gonna not function properly - update your software !

For nav discs for both units see GPSundergroundforums, theyll cost you nothing.

So, to reacp

a) your software probably needs updating, this will considerably improve performance, number of satellites found and add extra features, including music muting
b) check your screen brightness settings, if the screen is broken, I have a spare.