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Post by Casethecorvetteman on Apr 13, 2016 3:47:59 GMT -5
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Post by hulio on Apr 13, 2016 15:40:22 GMT -5
This is the newer SMPS2+G2 board R7631437 (older design is R763143) with the sub-board R7631437S (older one does not have a sub-board). A newer PCB design 78125, against 780846 for the old PCB. Together with the newer design main SMPS R7631427 and newer controller R7631255, it offers an adaptive voltage-generation (frequency dependent, CPU regulated) and is more protective against under and over voltages. The G2 voltage generation works a bit different (spot suppression to prevent spot burn on CRT's and have another behaviour in case of a scan fail or fan fail. It will work perfect with older SMPS and controller but i think it won't benefit from all improvements. I didn't payed to much attension to the differences in schemmatics, but here they are for people who are willing to dig more. R763143_Diagrams.pdf (362.38 KB)R7631437 Diagrams.pdf (218.74 KB)R7631437S Diagrams.pdf (131.8 KB)
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Post by Casethecorvetteman on Apr 14, 2016 1:30:21 GMT -5
Thanks mate, i have one of each here, ive pulled the new version out for now so it can undergo a rebuild. Ive got a newer version controller in there now, but in the process of rebuilding the original which i intend to put back into service because the newer version also needs a rebuild.
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Post by dummyload on Apr 14, 2016 14:35:37 GMT -5
Big chance in circuit very interesting ,why ? I have no knowledge of any problems with that board. Thanks again Hulio for the circuit diagrams ,do you also have the boards discription ? there seems to be extra leds? |
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Post by hulio on Apr 14, 2016 16:21:55 GMT -5
Older style board description only: R763143.pdf (49.89 KB) The change was not directly related to a failing board, but to give more feed-back to the user and make the projector more reliable. All diagnostic leds were removed from the main board and are to be found on the sub-board, in SMD form. There are indeed few more diagnostic leds comparing the old style, including FOC HI. Take a look at schematics of R7631437S. |
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