Need board map!

A schematic, or schematic diagram, is a representation of the elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic usually omits all details that are not relevant to the information the schematic is intended to convey, and may add unrealistic elements that aid comprehension. For example, a subway map intended for riders may represent a subway station with a dot; the dot doesn't resemble the actual station at all but gives the viewer information without unnecessary visual clutter. A schematic diagram of a chemical process uses symbols to represent the vessels, piping, valves, pumps, and other equipment of the system, emphasizing their interconnection paths and suppressing physical details. In an electronic circuit diagram, the layout of the symbols may not resemble the layout in the circuit. In the schematic diagram, the symbolic elements are arranged to be more easily interpreted by the viewer.

Schematics and other types of diagrams, e.g.,


Transit map, a schematic map (i.e. not drawn to scale, stations are equidistant, lines are drawn at 45 and 90-degree angles)

Schematic of a drive train

Chemical engineering schematic

exploded view of a 3D-engineering drawing

evinrude 1978 -1979 have a capacity discharge ignition unit as the control for the spark system
it runs wires to an ignition coil
so I would be suspicious of that unit
check all connections for corrosion and bad connections
I typed in electrical schematics for 1978 evinrude out board engine and found a site --www.maxrules.com which in the list of schematics has 55hp 1977-1978
press on that and you get a schematics of the wiring diagram evinrude 1978-1979 55hp
now I am aware that you state that yours is 35 hp but if it has 2 cylinders then it is a fair bet that the wiring diagram will be the same
any way there are plenty of other sites that may be of benefit

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
Some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
SMPS schematics to many popular TVs and other devices are given.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Schematic diagrams are in PDF; and cannot include here by this window.

Schematic diagrams are in PDF, and cannot include by this window. If you wish to get more details, check the site linked here. Surf the site in "MOSAIC" view. It will make surf easy.
http://electronicshelponline.blogspot.com/

Check these sites. It has schematic diagrams to many TVs. http://schematicscom.blogspot.com/ http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option.
Search the sites with the audio output IC number used.

Try this one:

http://www.drtube.com/schematics/marshall/9001-2.gif

Generally, this type of amp is relatively simple to repair if you're capable of replacing the blown parts. If you can find the web site for Nitro, you may be able to get a schematic. I couldn't find their site.

What troubleshooting have you done?

What parts are blown?

If you need help troubleshooting, I'd need a photo of the inside of the amplifier.
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