Lowrance x75 -black screen

that TPN-c126 is not the model number
In fact its the EPA/EU, power (sleep )and energystar
regulations RMN:TPN-C126 (the R means gov. regs)
proof here:
http://h22235.www2.hp.com/hpinfo/globalcitizenship/environment/productdata/Countries/_MultiCountry/europe_erplot3_notebo_201542919128520.pdf


if you look again at the back of pc. base.
on the right side of where you where looking
is a SERIAL.(I dont want that)
then below that, is model
"HP 255 - G5" (or very close)
when posting use real names and models
as seen here
http://partsurfer.hp.com/search.aspx

click Hierarchy
then notebooks
then hp notebook PCs
behold. photo below.
one is yours, matching words on bottom of your PC.

LT black screens
http://pcdied.com/black-screen.html#Laptop




below is your pc if you knew its real name.

Lowrance may have goofed on the manual printing. RED is Positive, Black is negative. All these systems have reverse polarity protection. If you wire backwards, the screen will flash on and then automatically turn off.
I install these systems and I have always put the fuse hlder on the positive line at the battery. The fuse holders are always red wires and that may also lead to some confusion if they suggest attaching that to the black lead.
Hope this answers your question.

Hey Les, Since you have replace both the unit and transducer, you have eliminated/diagnosed most of your problem.. Its in the wiring... sometime when I am in full GPS mode I get erroneous depth readings..?? Have you tried a different GPS module (the "puck")?

https://www.lowrance.com/Root/Lowrance-Documents/US/ELITE-5-7_HDI_OM_EN_988-10647-001_w.pdf

Has this unit worked in the past, or are the transducer and the unit itself new? Is this a Lowrance LMS-240 as indicated before your question?

Please let me know and I can help you out here.

Thanks, just reply here,
Tim

cant seem to get the power light working on the sonic hub. red to power, yellow to power, black earth etc...diagrams looks simple? however no joy

MY XD510c works fine then flashes 2.5 and fills the screen with black red blue white vertical lines...then after an amount of variable amount of time goes back to working for awhile

can hear power on my depth finder but i do not see a display or anything when it turns on

Check the reverse protection diode and capacitors on the unit's power circuit.

The LGC-2000 is bad would be the most likely cause, but if this started right after you changed the cables, Try connecting the NMEA 2000 network to a different power source than the main power. If you still have the original cables, and you didn't have the problem before, try using those again to make sure there isn't anything wrong with any of the new cables.

But most likely, the LGC-2000 is toast and you will want to contact Lowrance support to see about getting it repaired/replaced.

Here ya' go...all 51 pages of it for the x75 and x85:
http://www.lowrance.com/upload/Lowrance/Documents/Manuals/X7585_91201.pdf

Good unit...I use to sell them when I had my flats boat dealership.
Good luck.....