lbdk
Junior Member
Posts: 25 
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Post by lbdk on Dec 20, 2016 6:48:42 GMT -5
Startup sequence Is ok until the tubes lights up. Full crt-face edge to edge light heavily for 2 secs, then it auto shutdown. If all three crt neckboard pin-connectors are disconnected from mobo, it runs stable. And G2 reads 978V. It all started with a short between blue crt neckboard touching a chassis heatsink when pivoting the tube to align center cross. Blew F4 fuse in the SMPS. I can see in the schematics of the HVPS, (supplied by this forum)  , that HVPS should deliver a 1000V. I can't figure this one out... Anyone has a clue? |
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Post by gjaky on Dec 20, 2016 9:00:30 GMT -5
What is happening if only the green CRT card is connected?
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lbdk
Junior Member
Posts: 25
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Post by lbdk on Dec 20, 2016 10:50:54 GMT -5
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Post by mastertech on Dec 20, 2016 11:23:45 GMT -5
That is with green neckboard only?
Did you try turning down the G2 knob on the neckboard?
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lbdk
Junior Member
Posts: 25
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Post by lbdk on Dec 20, 2016 11:37:24 GMT -5
yes, G2 is all the way down.
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Post by mastertech on Dec 20, 2016 11:41:35 GMT -5
red and blue neckboards are removed? HV is removed from splitter for rd and blue? G2 wires disconnected from red and blue neckboards?
On that green neckboard, remove the black 2 wire line that comes from the rgb input board and test again.
Don't put your hands in projector while it is running with these things disconnected.
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lbdk
Junior Member
Posts: 25
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Post by lbdk on Dec 20, 2016 11:49:27 GMT -5
Exactly same result.
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Post by gjaky on Dec 20, 2016 11:57:58 GMT -5
I guess the blanking power supply is missing...
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lbdk
Junior Member
Posts: 25
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Post by lbdk on Dec 20, 2016 12:00:55 GMT -5
Ehh ? :-)
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Post by mastertech on Dec 20, 2016 12:30:20 GMT -5
Did you try the other 2 neckboards on just the green?
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lbdk
Junior Member
Posts: 25
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Post by lbdk on Dec 20, 2016 12:53:06 GMT -5
Same. Now I tryed connecting all three tubes again, after turning G2 all down it dont shut down. But no picture. Just flickering regardless of chl on all three tubes. Same as the video.
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Post by mastertech on Dec 20, 2016 13:06:37 GMT -5
Pick a neckboard and grab your DMM and test fuse F1 for open. Then diode test CR10 for short.
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lbdk
Junior Member
Posts: 25
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Post by lbdk on Dec 20, 2016 13:16:37 GMT -5
CR10, on which board?
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Post by mastertech on Dec 20, 2016 13:27:19 GMT -5
On the neckboard.  |
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lbdk
Junior Member
Posts: 25
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Post by lbdk on Dec 20, 2016 13:30:10 GMT -5
Found it, sorry:)
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, that HVPS should deliver a 1000V. I can't figure this one out... Anyone has a clue? 
