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Answer: Make sure you've calibrated your build first! After that, most problems are the result of one or more of the following conditions:
There is a lot of complexity to an 1176. Check your build carefully against the original schematic or the Hairball Build Guides. No drawing or wiring guide is completely foolproof and the original documents have been verified as correct (with the exception of R12 in the Rev D and related schematics).
You may be able to narrow down major issues to the troublesome section by checking voltages. Here is the Revision A V1.2.5 schematic with typical voltages added. Here's another for the Rev D/E and here's another schematic with voltages added from Jakob @ Gyraf for the Rev F and later.
Note that there is a voltage drop of approximately 0.6 V between the base and emitter of the bipolar transistors. Any voltages that are grossly different from the ones that appear in the schematic corresponding to the revision you're working on will point to the problem area. It may be a problem with the transistor itself or some other component, solder bridge, poor joint or mis-wiring as stated above. Test each component surrounding and including the transistor that gives the wrong voltage(s). Please note that I am not suggesting that you measure voltages and post them to the forum! If the voltages are wrong, you either have a faulty or incorrect component(s), component(s) inserted the wrong way, solder bridge or poor joint, mis-wiring, or you are simply measuring incorrectly.
If the fault appears to be in the audio path, you can trace the signal using Mark Burnley's DIY signal tracer hosted by DIY Factory. For other faults it can be useful to check typical voltages in the problem area and confirm them with a working unit.
If you are unable or unwilling to check the above, the next thing you can do is to use the search function at the Group DIY forum and see if someone has had a similar problem to yours.
If you're certain you have a unique problem that no one has resolved post a question to the appropriate section of the Group DIY Forum. The default thread for G1176 problems (mnats Rev J) is All things G1176 - the new "repost" thread. There is also a thread for the Rev A, a thread for the Rev D and another thread for the Rev F. Some kind soul will probably be able to help you out, and others may be able to benefit from your experience.
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