Introduction
The TW 350S is an auto-darkening LCD 11x9 cm found on some models of welding masks made by Telwin. This model is sealed and the use of glue is extensive, opening it require tools and some manual skills. Unfortunately, its design doesn't grant easy access to the battery, therefore even checking on the battery voltage requires tearing it apart, time and effort. The teardown is reversible.
Overall size: 110mm X 90mm X 9mm
View Area: 92mm X 42mm
power source: Solar-powered with 2 parallel 3v lithium battery backup
similar models can be purchased as replacement and are sold as: TX600BF; TX600CF; TX600DF; TX500CF; TX510EF; TX520EF; TX400BF and many more variations according to specific features, some of them feature easy access to the battery for inspection or replacement as well as a test button for easy test of the darkening functionality.
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Prior to the teardown of the filter, it must be freed from the welding mask.
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Use a couple of plungers to lift the knob and remove it from the spindle.
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Once the spindle is uncovered, use a small wrench or a pair of pliers to unscrew the nut holding the knob in place.
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Then press down the spindle to free it from the mask
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