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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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InFocus LP420 video projector
Dumped but with what looks like a brand new lamp inside.
I assume the projector failed and owner bought a new lamp but because a bit of a work up changing them , left it inside. Lamp reset sequence makes no difference, factory reset is via Menu screen. No response to the control panel buttons as far as the same LEDs stay the same. I've found the control line for lamp-on and taking the downstream side of its opto coupler H , the discharge lamp triggers and works fine . The so-called service manual out there is no help as board-level replacement "repair" only. All solder except the BGAs (as unseen) seem ok All DC levels for the controllers seem ok. As this lamp-on control rapidly goes to one of the 2 BGA proprietries labelled PENG and GUIN (have to be called something) is that the end of any repair? I will reassemble , now with a usable lamp , and see if anything turns up on the video screen |
#2
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InFocus LP420 video projector
Replaced a poor ESR 100uF on the main control pcb but no uC control of the
lamp |
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