2000 Evinrude 150 Tilt/Trim Problems

[PhrozeN_FisH]

I am trying to help a friend with his 150 Evinrude that the trim had become inoperative. I have tested connections through the relays according to service manuals, but both up and down tests pass, but when checking the ground side of the system it fails and states to replace the other relay. Both relays are new and had the same problem with old ones. When checking the terminals going to the trim motor on the PDP both terminals go hot whether up or down is pressed. I suspect that the diodes in the power distribution panel are bad and not providing a path to ground for the system. I can operate the trim motor by running +12v and ground to it directly.

Hope someone who has had experience with this could help direct me before ordering the PDP which is over $600.

Thanks for any help. Rod

 

[boobie]

Check the connections in the PDP Panel. There were some with bad solder connections.

 

[PhrozeN_FisH]

It seems to be a sealed unit so I don't think I can get to the connections.

 

[boobie]

I've never done it but I know the guys on here have gotten into them. Maybe somebody else will chime in.

 

[PhrozeN_FisH]

No Title

Thanks to Eric at Marine Computer Supply sharing a morsel of his knowledge with me, I decided to proceed with the repair. Once removed, I removed the 5 Phillip's screws holding the PDP and located the seam of the PDP. According to Eric; use a paint scraper to work into the seam and then work around the unit to open it being very cautious not to go too deep and damage the circuit board. Once opened I inspected the solder connections and found a bad solder joint at the 2nd terminal which is the ground terminal. I soldered all 4 connections, reinstalled and the system is working great.. Hope this helps someone else out.

 

[boobie]

Thanks for the info PhrozeN. If I ever run into this I'll know what to do. Thanks Again, Boobie.

 

[Fed]

Like brain surgery, a great result for you and thanks for the input from boobie & your own feedback on success.

 

[jakedaawg]

Could you please post type of solder/Flux used and technique?

 

[PhrozeN_FisH]

I used a small electric soldering iron and always use rosin core solder with any electronic components.

 

[interalian]

I would add that removal of the old solder will help make a better joint. Use solder wick or a vacuum piston solder pump. And the "bigger the blob, the better the job" does not apply. A smooth fillet is best. https://cdn-learn.adafruit.com/assets/assets/000/002/029/medium800/tools_Solder_Joint.gif?1447864331

 

[jakedaawg]

Thanks guys. Gonna find some old boards and practice. Seems like a useful skill in these modern times.