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Hello There is some missing output voltages from the power supply regulator board to your tv. Normally, these board are replaced as card basis. some of them are repairable too. You have to check this board first, to find whether it is repairable or not. If not replace it as card basis. Two vies of the power baord to your TV is attached here. This board can be purchased either from the authorised service center for Viewsonic at your town, or from any electronic sparepart selling shops at your town.
I have not been able to find a schmatic for this set either but was able to come up with part numbers for your power supply. The Viewsonic part number is B-00005305 but there is also a more generic number that should be located on the board that is FSP228-3F01.
Go to the Viewsonic web-site, click on CUSTOMER CARE, on the left column click on VIEWSONIC PARTS. You will need to log in or create an account. Enter the model number, board needed in this case the power supply. The rest is ordering, shipping info and check out.
Viewsonic normaly does not sell service manuals to non contracted servicers. You can call Viewsonic and see if they will sell you a service manual.
With the Pasma and LCD sets that we work on (we are not a Viewsonic rep), they are all supported from the manufacture for mainly board swap only, just like in a computer.
The circuit boards are mostly using SMD technology mounted and embeded in to multi layered circuit boards. Troubleshooting these boards is like trying to troubshoot computer boards. There is almost no supported component level service. In any case, you would also have problems to buy non generic type replacement components.
The service manuals do not always have detailed schematics of all the boards. The manual is more for modular assembly, specific types of service, and for doing the factory level alignments.
The plasma usually has 2 sheets of glass, the outer one sounds ok which is not good news as these can be replaced.
The inner panel is the actual plasma layer and if it is craked or broken it usually requires a swapout for a new panel.