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Digital Ballast Bypass Expirimenting
Digital Ballast Bypass Expirimenting
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Old 27th February 2015, 01:23 PM   #31
matthieuweber is offline matthieuweber
diyAudio Member
Join Date: Feb 2015
Hi HID556 !

On a Sanyo PLC XU41 Service manual, it's the pin number 3 (RA4 port) of the pic (16F88T)

It it can helps !

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Old 22nd October 2015, 06:45 PM   #32
ahto is offline ahto
diyAudio Member
Join Date: Oct 2015
I have an Epson EB-W8 projector, that seems to have a serial communication between ballast and projector motherboard. Could someone please help me to get this projector to work without the original bulb. Im hoping to modify it later to be used with LED lightsource.
When the original bulb is not connected to the ballast then the projector starts up, but after a while, it starts blinking red warning leds about lamp problem and shuts down.
Would it be possible to fool this ballast into thinking, that it's loaded with an original bulb even though it is not.
I added some images from the ballast controller board that is removed from the ballast main board.
Digital Ballast Bypass Expirimenting

Digital Ballast Bypass Expirimenting

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Old 1st April 2018, 06:35 PM   #33
mixxlegend is offline mixxlegend
diyAudio Member
Join Date: Apr 2018
Originally Posted by crazifunguy View Post
Well I managed to get a copy of the "Holy Grail" for this projector....AKA the service manual. Its funny that you were talking about using a PIC to communicate with the ballast. This projector uses a PIC to control all ballast functions.

After studying the schematics and trouble shooting. I figured that the Lamp_Err signal coming out of the PIC was the place to start. This signal is around 70mV and jumps to 5V when a lamp error is detected. This signal is sent through a buffer IC then to the main processor.

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By cutting the trace from the pic to the buffer and connecting the buffer pin to the buffer ground the projector stays on....

SUCCESS!! So far anyways. I havent tested for more than 2 minutes. I dont know what repeated errors will do to the pic or any other part of the circuit.
Hi all good people.... i trying to figure this out on my Sony VPL-CX3 it also have p87lpc769 controller... i don't know which pin trace should i cut and what is buffer? is PIC mean p87lpc769? can you be more precious which pin should i cut and how buffer looks like?
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