Author Topic: Trouble powering up  (Read 2539 times)

0 Members and 1 Guest are viewing this topic.

Offline cjbfisher

  • Newbie
  • *
  • Joined: Sep 2013
  • location: Queensland, Australia
  • Posts: 4
  • Unit(s): 798 hd ci
  • Software: 6.25
Trouble powering up
« on: September 23, 2013, 03:45:16 AM »
I had some trouble with my 798 cxi which was diagnosed as needing a new primary circuit board. Cutting a long story short, it couldn't be repaired, and it was replaced with a 798cxi hd. When I attach it to the auxilary power source to connect it to the PC, it works fine, but when I mount it on the base, it won't power up. I tried bending the pins slightly to make sure I had a good connection, but it didn't work. The battery is fully charged, and I'm getting 13v at the base.
Is there something different with the hd model that would be causing this?
Thanks,
Chris
P.S. I forgot to add earlier that I also removed the power cable from the base and plugged it directly into the unit without success.
« Last Edit: September 23, 2013, 11:38:58 AM by cjbfisher »


Offline Bob B

  • Hero Member
  • *****
  • Joined: Oct 2010
  • location: Creve Coeur, Il
  • Posts: 1565
  • Unit(s): 1197c si, 1198c si
  • Software: 6.310, 6.490
Re: Trouble powering up
« Reply #1 on: September 23, 2013, 04:15:28 PM »
Did you check the voltage with the unit attached and powered up?

If you have a loose connection somewhere, the voltage could look fine without the unit connected and then drop seriously once under load.
**Looking for the one that makes it all worthwhile**

Offline cjbfisher

  • Newbie
  • *
  • Joined: Sep 2013
  • location: Queensland, Australia
  • Posts: 4
  • Unit(s): 798 hd ci
  • Software: 6.25
Re: Trouble powering up
« Reply #2 on: September 23, 2013, 04:56:01 PM »
Did you check the voltage with the unit attached and powered up?

If you have a loose connection somewhere, the voltage could look fine without the unit connected and then drop seriously once under load.
Thanks for the reply Bob.
I can't test it under load, as I can't get it to power up at all. All of the connections are reasonably new, bound up nice and tight, and covered with heat shrink, so they shouldn't be able to work loose.
It doesn't make any sense to me as the unit powers up fine with the auxiliary power supply for the PC connection. That got me wondering if there was something different between the original 798 unit and the 798 hd unit that I now have.

Thanks

Offline Humminbird_Greg

  • Humminbird Helper
  • Humminbird Staff
  • *
  • Joined: Mar 2009
  • location: Eufaula, AL.
  • Posts: 6546
  • I help because I can
    • Humminbird Web Site
Re: Trouble powering up
« Reply #3 on: September 24, 2013, 09:48:20 AM »
No, there is no difference that would account for this.  The 798ciX HD Si unit should power right up.
Did the original 798 unit work on this same power cable?
If so, has there been any changes made to the boat’s wiring since then?
Make sure that the polarity at the power cable is correct.
If none of this points to any problem then it must be a current issue so you will need to disassemble all electrical connections, re-solder them and reseal them again.
Greg Walters at Humminbird
gwalters@johnsonoutdoors.com

Offline cjbfisher

  • Newbie
  • *
  • Joined: Sep 2013
  • location: Queensland, Australia
  • Posts: 4
  • Unit(s): 798 hd ci
  • Software: 6.25
Re: Trouble powering up
« Reply #4 on: September 24, 2013, 01:21:58 PM »
Thanks Greg,
Everything is still the same as when the original 798 was working. I had a quick look last night after work, and found a possible weak point in the wiring. It seems that the fuse holder may be the problem. That kind of make sense, as it is the only place in the wiring that is not really well covered and sealed up. Hopefully I'll have a bit more time after work today to pull it apart for a closer look.
Thanks again.

Offline cjbfisher

  • Newbie
  • *
  • Joined: Sep 2013
  • location: Queensland, Australia
  • Posts: 4
  • Unit(s): 798 hd ci
  • Software: 6.25
Re: Trouble powering up
« Reply #5 on: September 28, 2013, 09:29:19 PM »
I managed some time to have a good look today. As I suspected, the fuse holder was the problem. Swapped it out for a good quality waterproof holder. Problem gone.
Thanks for your help.
Chris


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo

 

Related Topics

  Subject / Started by Replies Last post
6 Replies
3758 Views
Last post February 15, 2013, 07:53:50 PM
by bear
21 Replies
7042 Views
Last post May 09, 2012, 11:11:48 AM
by Humminbird_Greg
12 Replies
3573 Views
Last post March 18, 2012, 07:41:31 AM
by Jason
7 Replies
2915 Views
Last post May 29, 2012, 08:50:59 AM
by Bob B
6 Replies
2054 Views
Last post March 06, 2013, 11:14:51 AM
by busterboy2238
2 Replies
1062 Views
Last post June 16, 2014, 02:43:37 PM
by MadTownGator
1 Replies
745 Views
Last post November 12, 2015, 06:22:00 PM
by rnvinc
5 Replies
1507 Views
Last post December 19, 2016, 11:52:21 AM
by Baker11


anything
SimplePortal 2.3.3 © 2008-2010, SimplePortal