Well, I opened a DW077 today as it didn't wanted to turn on. It was brought to me by a neighbor and he hadn't a clue what made it stop working. I removed the outside screws and rubber feet using a Torx T10 with a hole in the middle. Be careful not to remove the screws arranged in a square pattern as these hold the steppers in place. You don't want to mess with calibration ! Also be gentle with the rubber around the rotating head. You need to remove the metal ring on the outside to detach the rubber grommet..
Once open, there is not much to be found inside. There is one pcb, two steppers and some other plastic stuff.
Measuring over the big cap indicated 0.9v and over the small cap I had a unstable low voltage. After desoldering some wires, the underside of the PCB can be inspected (all components are on the underside). What I found there was that the main capacitor (1000µF 50v 105°C) of the 5v voltage regulator circuit was blown and leaking electrolyte. Not only was the capacitor gone, it also took an SI4532A mosfet array with it. The 3A fast chip fuse was still intact. The circuit pulled +- 10mA at rest and it went up to 20ma when depressing the power button. That SI4532A chip consists of a P and N mosfet in an SOIC 8pin package. The N side had a hole and the pins were blackened. My guess is that this controls the power on-power off signal that goes to the LM2596-5 buck regulator. I have made some pictures of the damage. So this is a route to research. Hope it helps someone
SOURCE: dewalt laser dw087 is blinking and cannot self
this unit does not have any replaceable parts, if the unis is covered by warranty, it would be exchange, if not then check with your local servicenter the max rate program to do so.
SOURCE: DEWALT DW079 LASER LEVEL CALIBRATION
You can not calibrate the Laser in the field it needs to be sent to a dewalt service center however you can check the calibration to see if it is off
download the manual here with instructions on how to check it
SOURCE: DEWALT LASER LEVEL SELF LEVELING THE LIGHT LASER
Laser diodes are no like light bulbs. When a light bulb burns out, it goes black. When a laser diode burns out, it goes to an extreme low power state. You can see red at the source, but there is no beam to speak of. If this is what you're seeing, then contact Dewalt. They are low quality instruments, but will try there best to get you a new one, at a reasonable price.
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Hi,
I know this is old but I have the same issue. Capacitor leaking and one leg burned off 4532a. Just wondering did you successfully repair your unit. Thank you.
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