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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.
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I have a miller spectrum 1251 for sale. We moved to a different shop that doesn't have three phase, but the machine has only been used a couple of times. You can reach me at 660-229-0171 if you are interested.
The replacement of a board is no TOO hard, just DRAW a Diagram of ALL connections when you take the "Old" one out. NEVER work on the machine live Duh, also always wait a bit to allow capacitors to discharge, or use a shorting stick, if in a hurry. Anyhow, make sure you keep all fixtures together note down all connections and label them with little stickers, With any other information on the stickers as need be. I always do this as one never remembers whats what after a bit, anyway. Just be methodical, and you will prevail.
check your torch and make sure nothing is loose. If that does not fix it you will need to disassemble the tip and make sure there is not any debris if there is clean it out and replace any worn parts.
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