Broken microscope light

SOURCE: only power light will power on for few seconds then flashes.

Does the main lamp light at all? It sounds light a cooling fan failure. If the fan iis not working the the main lamp will not turn on and the power light will flash.

SOURCE: need replacement part for my sons vivitar microscope set

You turn the light on by LITTERALLY turning the light on it's hinges. It swivels and when the light is in it's downward position (with the little light bulb pointing towards the ground) it is off. When you flip it over (with the little light bulb pointing towards the the veiwing platform) it should turn on.

If you look closely, you'll see the metal-to-metal contact pieces that trigger the light to come on.

Good luck!

SOURCE: I need a new eyepiece for my Swift 3200 microscope

Hello--I have recently bought Swift eyepieces and objectives on UK Ebay.They come up regularly and sell for £4-£18 dependant on spec--any help?kind regards martin r

SOURCE: TDP-S8 Power supply led not lighting up. Unit not working

There seems to be problem in your power supply. Look for any swollen capacitor --- generally 3300uf, 10V. Be careful about the polarity of the capacitor before you take it out. Check the capacitor to make sure how it's mounted ( for polarity purpose). Negative side of capacitor will be toward the outside of pc board. Substituting 2200uf, 16V capacitor for 3300uf, 10V will work ok.

SOURCE: 42 LG plasma no picture but sound. found internal

Sounds like it started "Protection Mode" because of a failed electronic part inside the TV. When this happens, the TV will keep turning itself OFF or will not turn ON at all. This keeps the other parts inside from being damaged. Most likely the TV has a power supply related problem. The common part to go bad for flat panel screens circuit board that powers the screen itself. Most manufactures call it a Backlight Inverter Board.
But, I can't say what is 100% the problem because I can't actually look at the tv over the internet. I can only make guesses with the symptom.

You have a few choices:
1. Best thing to do, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, schematics, test points, and part# lists.Usually, cost under $20. Its the best repair guide material for fixing TVs. And most cases the new part cost less than $15 by searching on the internet with the part number.
2. Pay a TV shop to do the repairs. It maybe costly, but get an estimate of how much they will charge. That way you can decide if it worth repairing or replacing the whole TV.

I hope I shed some light on the subject for you.