How to test a DLP Ballast

[electronicsurplus]

Does anyone know how to check a ballast in a DLP or Inverter in a LCD?

Is this even possible?

What would I use to test the output? I have High Voltage Probe. The type we used to use to test old Flybacks in CRT

Can anyone help shed some light on this?

Since, currently, the only way we can test is to install in a known working television to verify.

But, I am sure there must be some way to drive the Ballast or Inverter to test it's output and functionality

I am sure this will help a lot of people

Thanks

Jon

[ratdude747]

Re: How to test a DLP Ballast

Moved out of a FAQ thread.

It wasn't even on topic man... Unless you are a veteran member posting a legitimate and often asked for "How-to Guide" thread, Don't post in the FAQ.

[tom66]

Re: How to test a DLP Ballast

Use an LCR meter and measure inductance if you like, but the simplest test should be for continuity - it should be a short at DC.

[selldoor]

Re: How to test a DLP Ballast

I dont think I have seen more than 3 posts re DLP Tvs on here. I did find a partial test for Ballast but nothing on testing the output. The input from the power supply should be in the region of 350-400vdc
Pull the lamp housing
Tie the door switch up to the closed position
Turn on the TV
All Fans should run, Color wheel should spin listen or shine a flashlight in the lamp side window to verify
Watch at the left back side of the Ballast board for the starter to flash it will cycle flash three times
Pull power cord from back of TV to shut off or it will continue to try the three attempt cycle.

Regarding Inverter transformers other than spare bulbs or
a tester (which is just a bulb) there doesnt seem to be
a measurable output test.We tend to try and measure primary and secondary windings and check the input voltage.

[tom66]

Re: How to test a DLP Ballast

Most DLP lamps are around 20 to 50V, I thought... Maybe more for more recent ones?

[electronicsurplus]

Re: How to test a DLP Ballast

Thank you
tom66 and selldoor for the input