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Looking for D3 touch screen circuit diagram, component fried
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Dr Jones
 


Member Since: 20 Feb 2012
Location: Pretoria
Posts: 33

South Africa 2005 Discovery 3 4.4 V8 HSE Auto Chawton WhiteDiscovery 3
Looking for D3 touch screen circuit diagram, component fried

So today whilst installing a switch for the aux fuel tank I managed to have some magic smoke escape from the back of my touch screen. As far as I can figure, I probably touched one of the wires going to the RRS mode switch to a live.

At the back of the topmost circuit board there is, or in my case, was a semiconductor marked D56. The board is multi-layer so I did not even try and trace where it goes but it is on the opposite side of the connector that goes to the buttons one need to intercept in order to enable RRS mode, thus my theory of what went wrong.

Does anyone perhaps know what the relevant component's number is?
  
Post #187101821st Oct 2017 9:03 pm
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timmyt79
 


Member Since: 18 Oct 2016
Location: Pemrokeshire
Posts: 153

Wales 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Cant help with circuit diagrams sorry but have a complete screen unit if you want it?see my post and pm me if interested
  
Post #187102621st Oct 2017 9:39 pm
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Rene_Sp
 


Member Since: 20 Sep 2017
Location: @Home
Posts: 21

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

D marking is nomaley a Diode.

Is the D56 in writing on the Printed board ?

There should be a marking code on the component it self as well.
But that could be unreadable due to the short circuit.

If there is somebody who can read the marking code of the component you can try to find out the specs/data of the component and replace it.
  
Post #187172524th Oct 2017 10:22 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 1701

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

It just says C3 on the component with some dots under the 3.

It's the same as D57. There are 5 of them together


It's worth nothing on the reverse side of the board (in the area with the transformer) are 2 tiny surface mount fuses. F2 & F6
F2 can fail. The whole unit appears dead, with no optical connectivity (so no audio out the speakers/volume control) due to broken fuse.
 

Last edited by Pete K on 19th Nov 2017 9:03 pm. Edited 1 time in total 
Post #188120619th Nov 2017 1:34 pm
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Rene_Sp
 


Member Since: 20 Sep 2017
Location: @Home
Posts: 21

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

can you post a detailed picture ?
  
Post #188132319th Nov 2017 6:46 pm
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Dr Jones
 


Member Since: 20 Feb 2012
Location: Pretoria
Posts: 33

South Africa 2005 Discovery 3 4.4 V8 HSE Auto Chawton WhiteDiscovery 3

Hi guys. I managed to source a second hand screen as I needed it rather urgently.

I did open the replacement up to confirm the component. It is as Pete K said. C3 with ** .

I asked the local electronic repair shop if they felt up to giving it a try but they declined so at this stage I'm holding on to the fried screen as it's now practically worthless but it can be scavenged if need be in future.

Pitty, about 15 years ago whilst still in the Air Force I could have asked the avionic shop at 5 Air Depot to help out, they did amazing things with SMD boards that got damaged.
  
Post #188151920th Nov 2017 9:24 am
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Rene_Sp
 


Member Since: 20 Sep 2017
Location: @Home
Posts: 21

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

C3 **

Checking the marking code overview is shows a DC/DC step down converter.
But then it is a 5-8 pins little chip.

http://www.s-manuals.com/smd/c3

I can't see D56 in the picture to verify this.


Could make sense:
If the step down making 1.8V is missing/not working
all electronics using this power rail are failing as well.
  
Post #188153020th Nov 2017 9:40 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 1701

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

To me it's a diode but in a 3 pin FET like package.


If you look in the picture, there is the big IC in the middle.
To the left a crystal like device in metal can?
Then slightly left of this an upwards are 5 tiny FET/Transistor like packages.

  
Post #188160020th Nov 2017 12:11 pm
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Rene_Sp
 


Member Since: 20 Sep 2017
Location: @Home
Posts: 21

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

3 pins then it still has 3 options.

Transistor
Diode
FET


You can try a diode mode measurement to try and find out what it is ...
  
Post #188160220th Nov 2017 12:18 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 1701

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

And as its identified as D
I suspect its a diode
  
Post #188160420th Nov 2017 12:23 pm
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Rene_Sp
 


Member Since: 20 Sep 2017
Location: @Home
Posts: 21

Netherlands 2005 Discovery 3 4.4 V8 HSE Auto Java BlackDiscovery 3

True

But even then

3 pins

a diode only needs 2
So there are more options how the diode is in the package.

Could be even 2 diodes in the package and only 1 used....



Diode measurement can sort that
  
Post #188161120th Nov 2017 12:29 pm
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