Question about ViewSonic N1930W 19 in. LCD TV
I'm at a total loss here, it only seems like the brightness is doing something, but even then its just making the black brighter, not actually the picture. again its a viewsonic N1930-2m. any help is appreciated.
Backlighting bulbs are out. They may need replacing, but check to see if they are getting power first.
Posted on Dec 03, 2014
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Posted on Jan 02, 2017
i have repaired several n3750w viewsonics .. that may be similar to the 2750 .. in my case all the failures were caused by the same faulty part in the power supply .. the power supply has a 48 volt supply at about 7 amps .. the design uses a syncronous rectifier .. these are normally not used in supplies with that high a voltage out .. syncronous rectifiers make sense when the output voltage is low .. like 3 or 5 volts .. the parts are designed for that range .. but in this supply an IC is over stressed and fails frequently .. you might hear a chirping sound as the supply cycles thru an overload condition .. i modified the power supply to eliminate the syncronous rectifier and replaced it with a single shottky diode .. dissapation goes up slightly but reliability goes up a lot .. i have written an article on this. if anyone needs it i will try to find it . ..
Posted on Jul 25, 2009
Are you trying to get the HD signal from the roof antenna or from cable? when you set the tuner to scan for channels make sure it is set for 'CABLE' if you are on cable, or 'AIR' if using roof antenna.
Posted on Oct 31, 2009
There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
Please post back what you find.
Posted on Nov 21, 2009
Sounds like your power supply electrolytic caps are going bad.....or you have a small board break in one of the circuit connections that doesnt break until the unit warms up.
First, you can use a can of cold blast to check for that heat break. You need to be able to shoot the cold blast at small areas of the board to see when the unit comes back on..indicating the break was shrunk closed by the coldness of the spray. If the unit fails to come on....you can remove the power supply and replace the caps as a group *(recommended since when one is bad...the others are sure to follow)
Good luck and be careful. These power supplys produce high voltage for the backlight and have `110V AC running into them. Be very sure you are adept at handling live circuits or find someone with electronics skills who will work on the cheap!
Posted on Mar 11, 2010
According to this image, the input you are looking for is marked 'G'.
You would then use the Input button on your remote control to select that option. The OSD does not support selection of the input.
Posted on Oct 27, 2010
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