Question about ViewSonic NextVision N3760W 37 in. LCD Television
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Posted on Jan 02, 2017
SOURCE: Viewsonic N3250W won't power on
I just repaired an FSP 212-3F01 power supply in a Viewsonic N3250W. I have seen the same power supply listed for the N3235W. This one was totally dead with no 5V stand by present. The problem was a shorted internal voltage regulator made up of Q7 and ZD4. The Q7 is a SOT23 size device and appears to be too small and over heats in the design. In this case it shorted from the over heating and that caused ZD4 to fail and shut down a 15V bias supply on the power supply board. I replaced Q7 with a 2N4401 to give it more power capability. Any small NPN transistor with a 25V or higher Vce rating will probably work. ZD4 is a 15V zener diode.
Posted on Jun 26, 2008
SOURCE: viewsonic n3251w - no power
A lot of TVs are having their power boards go bad due to a poor brand of capacitor (CapXon usually).
If small problems are noticed with the tv, the solution is to replace the capacitors. However, once the TV gets to the point where there is no power at all any more (not even a stand-by light) then the power supply has to be replaced.
Visit Viewsonic's website or call your local Viewsonic repair shop to get a price on this board. They are usually under $100.
Posted on Nov 26, 2008
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