Epson EH-TW6700 auto iris error

[ApertureScience]

I bought a broken Epson EH-TW6700 projector with mainboard failure. After booting up it showed the auto iris error. So I took it apart and had a go at it. Its not really an iris, more like an eyelid
After cleaning the mechanical parts, as suggesgted by the internets, nothing happened. So I probed around, no signal on the motor whatever. After probing the driver IC, a TI DRV8846, I wasn't seeing any voltage.
The dead DC-DC converter responsible is a TI TPS54335A. Currently waiting for the part, but i hope that settles that.

[ApertureScience]

UPDATE: IT'S ALIVE!

[dan776]

Hi ApertureScience  ,
I also have this error, but I am not so experienced in measuring.
Is the DC-DC converter on the mainboard or directly on the iris panel? Does the part have to be disassembled and measured or in the installed state? How to measure is of course also interesting to me.
 I would be very happy if you can help me.

best regards
Dan

[David_AVD]

I have an Epson EH-TW5000 that went back under warranty for an auto iris issue (many years ago).

If it happens again I'll have to see if I can fix it in a similar way.

[malebuffy]

UPDATE: IT'S ALIVE!

Mine too!!!!! Thanks very much! Basically if your Auto Iris looks just fine, it's the Dc-DC converter that needs replacement!

It's not an easy task, but if you have done some micro soldering you should be fine!