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Old 03-19-2012, 07:21 PM   #1
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Default How to fix compass and temperature readout LED (10th gen trucks)

03 F150 FX4 5.4

It's been about 6 months now since my "over head" temperature and compass readout stopped working. I used a voltage meter to check the connections on the wiring and found no bad connections. Hence, I started googling to see if other people had this issue. What i found: In most cases after a few years or rattling in the cab the small wires and terminals connected to the resistors and motherboard can come loose.

Here's a sort of do it yourself to check and fix a loose resistor of terminal clip.

Tools needed:
Phillips screwdriver
Flat head screwdriver(for prying) or other pry tool
T15 torq bit
Soldering iron and solder

Step 1:
Their are 2 clips and 1 screw that hold the flatform to the roof of the cab. Remove the one black screw next to the windshield first. See pic below;
Click the image to open in full size.
After that screw is removed, move to the back of the platform and gently pry/pull until each clip(on both sides) comes loose;
Click the image to open in full size.
Click the image to open in full size.

Step 2: Once the screw and 2 clips are unattached from the roof, the only thing left to unhooks is the wireharness.
Click the image to open in full size.
This harness has a push in release on the right side to unattach it. Seen in the pic below
Click the image to open in full size.

Step 3: Once you have the entire grey platform down you will see 4 torq screws holding the LED and motherboard. Use a T15 torq bit to unscrew these. Click the image to open in full size.
Click the image to open in full size.
Note: after you remove the 4 torq scres, their is a slide in clip on one end up need to pull out before removingsee pic)
Click the image to open in full size.

Step 4: Once you have the LED setup unscrewed from the grey platform, remove it and notice 4 push in tabs that hold the casing together.
Click the image to open in full size.
Slightly pull each tab out to open on casing.

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Old 03-19-2012, 07:23 PM   #2
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Default How to fix compass and temperature readout LED(part 2)

Step 5: Now that you can see the motherboard for the LED notice the two plastice tips coming through the board to hold it in place. Gently lift the board up over these and pull it out and gain access to the full board.
Click the image to open in full size.
Click the image to open in full size.

When all the way out, it should look like this
Click the image to open in full size.

Last setp: Now that you have full acess, check the board for loose or broken resistors or terminals. Usually, you can turn it upside down to see if anything moves or rattles. In most cases its a terminal connections that has broke. If you look at my last pictures you will see a small solder bead where my connection was broke.Click the image to open in full size.

When you find the loose connections/terminal, run a small bead of solder onto the motherboard and the existing terminal/ resister.(Make sure you get metal on metal). NOTE: in most cases i have read, it is the terminal I have soldered that has ratteled loose!

After you solder the connection, plug the LED platform back to the factory wire harness(on the roof) to check and see if it works.

Click the image to open in full size.
Mine did, so I was a happy camper.

Then just do the process in reverse to mount eveyrthing back to its original position.
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Old 07-19-2012, 02:05 AM   #3
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Approved and Moved ....Also merged both threads.
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Old 07-23-2012, 03:44 AM   #4
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Thanks bob. I wasnt sure if I need to include its for the 10th generation pickups.
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Old 07-23-2012, 04:15 AM   #5
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I put that in the title, And deleted the Part one thing since its all one part meow
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Old 05-17-2013, 10:55 AM   #6
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Thanks ibd2328, fixed my problem just like you said.
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Old 05-17-2013, 01:13 PM   #7
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Glad you got it working.
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Old 05-20-2013, 10:21 PM   #8
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My circuit board did not have any obvious terminals that needed to be soldered; I found a guy on eBay that does a lifetime warrantied repair for $27.00. I post my opinion once I get mine back.
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Old 08-02-2013, 10:42 AM   #9
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Default compass and temperature readout LED

Hi ibd2328, Thanks for the great directions on how to fix the temp readout. Now it works again. But I have a question. The terminal that you soldered is the same one I had to do. When it's on,both of the resistors are too hot too touch, and the board also gets warm. Is this normal? Thanks for any help you could give.
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Old 08-02-2013, 10:32 PM   #10
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You are very welcome, resistors tend to hold/dissipate some heat due to energy exchange. It should be super hot, but a warm feeling should be fine.
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