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Infocus X10 ballast bypass
Infocus X10 ballast bypass
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Old 30th October 2012, 09:03 AM   #1
jeevs is offline jeevs
diyAudio Member
Join Date: Oct 2012
Question Infocus X10 ballast bypass

Hi All,
I am trying to bypass the ballast on an InFocus X10 projector. So far no success as it shuts down after the initial sequence. Here are the steps I tried.

The control cable is of 5 wire. The voltages with no lamp and boot up are as below

The voltages with lamp in and bootup are below
+3.2 when lamp is warming up and +4.17 when lamp is warmed up and displaying image. +4.2 on power down.

I grounded the +3.2 wire and used a variable resistor to supply 4.17 to the 4th pin taking power from the +5 pin but still it shuts down a fraction of a second after the bootup sequence.
I thought it is missing a lamp source so put a 100W led complete with heat sink, lens and all but still same behavior.
The 4.17v wire does not show a constant voltage in my digital multimeter but it varies 4.17 to 4.18. Whereas +5 remains a constant 5.
I think its a signal and not just a constant voltage. I am stuck on how to figure out if it is a signal and how to bypass it.

Below is the make and model of what is written on the ballast
EUC 300c P/11
9137 008 91969

The online doc in the link below is of 260d maybe the older version of the ballast, but looks and wiring is quite similar

百度文库--您的访问出错了 ... 93931.html

Please, anyone share some info if this bypass can be achieved.

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Old 18th February 2014, 01:55 AM   #2
bobegnops is offline bobegnops
diyAudio Member
Join Date: Jul 2011
Default ballast bypass

no luck so far ?

I have the same ballast - still looking
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Old 22nd March 2014, 08:43 PM   #3
abradatanu is offline abradatanu  United Kingdom
diyAudio Member
Join Date: Mar 2012
I know this is an old thread but it might help others

Look at the attached image and find the 3 optocouplers on your power supply board in your projector and you'll see that one of them will be facing the oposite way. Solder its feet as shown in the image and it should bypass the lamp.

I've tried this with 3 projectors so far and they all worked
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File Type: jpg FLS25S8HD4VGSE5.LARGE.jpg (200.7 KB, 53 views)
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