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    Boost Convertor using LT3757

    Anything else you left out....???
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    Edifier monitors, blown amp?

    Cap in the first photo looks a bit sick.....
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    Boost Convertor using LT3757

    Spec shows sync pin connected to ground, don't see any on your diagram. (pin 5)
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    connector; type name?

    Motorcycles do also seen in older vehicles. Just as an example........
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    connector; type name?

    Bullet.
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    Deskfan switch failure

    sounds like a dodgy rotary switch...not much to do except a new switch. Any attempt to dismantle it would undoubtfully end up with a pile of springs, contacts and other aux bits scattered all over.
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    Cable screens connected to circuit ground?

    Any screening is normally done one end only to avoid earth loop current flow and again, usually at the source end.
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    TEAC stereo receiver won't turn on

    A full wave bridge rectifier consists of 4 diodes. Transformers which use centre tap use only 2 diodes for full wave. First, verify your red and black leads are the correct way around in the meter by testing on a known good diode ( say for instance a common 1N4004) Assuming a digital meter...
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    Panasonic A/C communication protocol

    No argument there but finding just what that is could be likened to guessing how many jellybeans in a jar. These days things tend to be microcontroller based and digital sensor output for accuracy so aside from perhaps I2C or whatever, then there remains the programming. Good luck at reverse...
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    Negative Voltage #2

    Mains are referenced to ground so no. In fact the MEN system is so arranged to make sure mains potential does not rise above ground.
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    TEAC stereo receiver won't turn on

    How did you determine the bridge rectifier was crook?
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    Panasonic A/C communication protocol

    Probably thermistors but just how Panasonic decide to interface that with the main units would almost be a company secret I would assume. Could be any of a number of ways.
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    TEAC stereo receiver won't turn on

    Probably...... :) Just had my fill of those calling themselves engineers as if to impress or make a difference somehow. Had many of them at Gov. Water Resources many years ago who didn't know s***t from clay or as some say, their rrsss from their elbow.
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    TEAC stereo receiver won't turn on

    Unable to follow any of your explanation of this or most of what comes after. When referencing a point ( say terminal 5) you will need to be specific as there are many terminal 5. Establish the basic input power initially. i.e. power to and from the main transformer and stick to that initially...
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    Short pulse generator determined by voltage change

    Think you'll have to be a bit more specific on your parameters.
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    TEAC stereo receiver won't turn on

    Not much point measuring with reference to the chassis as the incoming supply never connects to there. Reference point will need to be the neutral of the incoming mains ( Terminal 1 ....CP111 or Terminal 1 CP110) for the transformer primary. Pretty clear in the diagram you linked to and I copied...
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    Help with flash chip datasheet, says maximum voltage on pins is 0.5V?

    Probably a misprint...... Then the next line says this.......... During voltage transitions, input or I/O pins may overshoot to VCC +1.5V for periods up to 20ns.
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    TEAC stereo receiver won't turn on

    Not a good idea to start injecting outside voltages into a circuit to test things. Diode on the relay is a freewheeling diode to stop line noise as the relay opens and closes. Most likely when testing devices such as this is to unsolder one leg out of circuit otherwise you will get wrong...
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    Does 1/4W metal film resistor have a resistance of 100M ohms?

    100 meg does seem a bit high. Where did you obtained the schematic....
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    Controlling/limiting a 6v DC motor with polarity module

    No, what the spec says is whatever power supply you use with a motor, it must have at least 3 times the power. Meaning if your motor draws say 30W, then the supply must be able to deliver at least 90W. Then down a bit further is this......... The maximum load current is 2A. If it is a load...
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