Join Date: Jan 2010
Location: Denver, CO area
Thanked 75 Times in 61 Posts
The link that wastedwagesracing posted in response to your message is the exact information I studied before reworking my FICM. Contained in this thread are pictures and instructions on what to resolder. I'm sorry I didn't re-post these exact pictures, but they are in the thread.
I'll help you understand my opinion on why some of the FICM's are failing.
First, my belief of why a large number of FICM's are failing is because (I believe) the circuit board was designed with a flaw.
The flaw on both the FICM power supply and also the FICM logic board is the lack of thermal isolation on a number of the pads connected to the power and/or ground planes. When you try to solder some of these connections, you'll notice how hard it is to get the solder to flow out correctly. The reason is because the pads have an over abundance of copper area connecting them to the power or ground plane. You can see how the designer was so concerned about insuring adequate current flow that they connected some of these pads to the power or ground plane using multiple vias (connections through the board). These look like holes in the pads, that fill with solder if the pad is heated sufficiently. The problem is they also conduct heat very effectively, which draws the temperature of the solder down, making it difficult to achieve a correct connection.
In the links that show what to solder (on the power board) look for 4 resistors, 2 on the left side of the board and 2 on right. Each pair of resistors will be located right next to each other. They look like this on the board. Look for the pictures in the link... the 4 resistors are circled in red for you.
The joints that need work the most are the ones in the middle. These will be very difficult to get hot enough to get the solder to flow right. I used a 30 Watt soldering iron (a wand type, which I bought at Radio Shack). Even with this large iron it took me about 3 minutes to solder each of the joints. The solder would stick, but would not flow under the resistor, leaving a cold joint.
Once you understand how to solder these 4 resistors on the FICM power board, you will understand what the problem is and what you will need to fix on the logic board. There may be many cold joints on the logic board, you need to learn how to identify them visually. Look for components, where the solder joint does not have a rounded filet of solder. But instead, it looks like the component is resting on the pad, with no solder....also, there will be some brown flux on the pad where solder should be. You need to add heat while adding a small amount of solder at the same time as touching both the component and the pad. If you succeed, some of the solder will disappear in between the component and the pad. If you fail, the solder will ball up on top and never flow out. You can retry over and over, but not until you clean off the solder from the prior attempt.
Good luck....if you need additional help, let me know, I can help describe the process to you better if you need me to.
06' F250 Mods:
-K&N E-0780 Air Box, ZooDad Mod
-Garrett Powermax Turbo, CFM+ Smallmouth Intake Manifold
-Blue Fuel Pressure Spring, Large fuel lines from pressure regulator to heads
-MBRP 4" Turbo back exhaust; cat installed
-SCT SF3 Tuner w/SRL custom tunes from Matt at GearheadAutomotivePerformance.com
-Refurbished 50 volt FICM, Eliminated STC fitting, upgraded stand pipes and dummy plugs, Bulletproof Diesel EGR cooler, upgraded turbo oil supply and drain
-Oil change rotation; 5k-5W40/5k-15W40/5k-15W40
--Rotella T5 or Valvoline Blue Extreme 5W40, Rotella or NAPA 15W40, Archoil 9100 friction modifier (16 ounces to crank case; 10 ounces to each differential)
--2/3 Qt. tcw3 2 cycle oil per tank Power Service (5 oz. Stanadyne every tank)
-Cooling system flush with Restore and VC-9 @ 73,000 miles w/new thermostat
-Eliminated clunk while sitting at a light (75,000 miles); Lubed rear drive-shaft spline with Ford lubricant; Symptom returned at 100,000 miles...re-lubed at 112,000 miles....wow!! it's so smooth again.
-1/2" shim on carrier bearing mount
--Original Motorcraft lasted 4 1/2 years
--AutoZone Duralast Gold lasted less than 3 years
---(with 2/0 cables between + terminals)
--Still on 2nd set of Autozone Gold (replaced free)
--DC Power 185 amp
-Teflon sway bar bushings
-Moog Ball Joints (originals seem to be holding tight at 108,000 miles; it's just a daily driver, so this seems to make sense)
-Cooling system filter
-OEM HG/ARP studs