Digital projector Ballast Epson EP-824H
One of my friends brought to me this Projector after he missed up with the ballast. its Digital UART serial Bus function.
He told:
he was trying to trace the serial bus code with USB Logic on 2CH TX & RX. he used to soldering the CH wire to PIN 1 of 2 optocoupler PC123, and as soon he switched the projector ON, he heard once at time crack noise. result his logic went dead & the projector shutdown and give blinking led error.. and always his projector wont start any more register same error all 3 LED power lamp Temo blinking Red.
Trouble shooting :
i found 1 PC123 optocoupler defect ( Open), i soldered out the Digital boards from the ballast and stooped doing any till my order of PC123 arrive as i don't have this optocoupler any more in stock.
My mysterious case:
i don't have Diagram on this ballast, i traced the defective optocoupler PIN 1 because of broken solder joint of it ( lucky nothing on the back side related to this solder joint ) so its goes to the blue SMD i things its R as it read 1.5K but there are some same color and size of this SMD part are reading different some 13.5K / 2.K / R100 from this point i raised the white Flag and come over here to post the issue hope some one owned the diagram or share his idea why this SMD part had such mysterious value thought nothings printed on it or maybe there are print but on the other side.. !! tell the truth i don't have the courage to take one out of the boards for more inspect before the PC123 arriving.
i appreciated any idea
Diah
He told:
he was trying to trace the serial bus code with USB Logic on 2CH TX & RX. he used to soldering the CH wire to PIN 1 of 2 optocoupler PC123, and as soon he switched the projector ON, he heard once at time crack noise. result his logic went dead & the projector shutdown and give blinking led error.. and always his projector wont start any more register same error all 3 LED power lamp Temo blinking Red.
Trouble shooting :
i found 1 PC123 optocoupler defect ( Open), i soldered out the Digital boards from the ballast and stooped doing any till my order of PC123 arrive as i don't have this optocoupler any more in stock.
My mysterious case:
i don't have Diagram on this ballast, i traced the defective optocoupler PIN 1 because of broken solder joint of it ( lucky nothing on the back side related to this solder joint ) so its goes to the blue SMD i things its R as it read 1.5K but there are some same color and size of this SMD part are reading different some 13.5K / 2.K / R100 from this point i raised the white Flag and come over here to post the issue hope some one owned the diagram or share his idea why this SMD part had such mysterious value thought nothings printed on it or maybe there are print but on the other side.. !! tell the truth i don't have the courage to take one out of the boards for more inspect before the PC123 arriving.
i appreciated any idea
Diah
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