Question about ViewSonic N3250W Television
A local 911 Dispatch center has three of these LCD TV's. They all had Manufacture date of July 2005 on them Three of four have all gone down with no power up problem. Found capacitors bad on all three, able to fix first two with after market better caps. This last unit has burnt-up power supply and can't get any support from Viewsonic fort repairs. Unable to reach anyone last two weeks. Heard they moved from NC to CA and things are back logged. Never deal with Viewsonic products again.
Got the same problem for a N3250. I'm not an electronic engineer and will attempt to fix my TV. Therefore I got the FSP2123F02 ($49.75)and now they have a harness 4WT0062302GP ($8.90) that will do a quick plug and play and will avoid any solder of the pins. That is my understanding can anyone corroborate this procedure. By the way I got both products from electronica-usa.com
I repaired it on June 28th with the lsit of parts above
More deatil information here (of the problem) http://forum.eserviceinfo.com/viewtopic.php?p=149367#149367
List of photos
A) new Power supply on TV
B) new Power supply and new 12 pin connector (plug and play)
C) old board
D) TV picture in HD
Posted on Jun 28, 2009
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
Go to Power-On.com and look under LCD TV. It takes 6 to 10 days to get a new replacement for $45 plus S/H. The replacements come with a pin plug where the soldered on cable of the original is located. Depending on your set, you may have to unsolder the pins and use the cable from the old unit in it's place (an easy modification). ViewSonic was rather inconsistent on the power supplies they used. All are form and fit replacements with only the physical difference of the cable. You can contact me at InVisionTec@Comcast.net if you have questions.
Posted on Apr 26, 2009
I looked at the good advice given by JRnTX to diagnose a Viewsonic N3252W with the symptom of no power. I tested the Q7 transistor and ZD4 zener diode and both were bad. I replaced the transistor with a 2N4401 transistor and the zener diode. I also replaced all the capacitors while I had the board out. I tested them all with an ESR meter. Several were out of spec but none completely gone. Good preventative measure to replace them anyway. Only a few pennies. Total cost to repair the board was about 7 to 10 dollars. I already had some of the required capacitors and don't remember their initial cost but they are pretty cheap. The power supply board was FSP212-3F01. It has now been replaced by FSP212-3F02 which usually comes with a backward compatible adapter to replace the 3F01. If you have a "no power" issue with one of these TVs that use the 3F01 board check the Q7 and ZD4 first. They are surface mount components so look for them on the underside of the board, not on the top.
Posted on Jan 10, 2010
Check the power supply, it seems to be a common problem with this tv.
this website was made by some brilliant french guy and it gives a lot
of good information about the problem, and how to fix it. I recommend
either getting a new board from one of the suppliers he lists or do as
I did and get the small chip and solder it in or have someone do it for
you. mine is working great and I only spent $20 on the chip.
Posted on Aug 06, 2008
Lookin from top view (middle leg on on top)
Left = Base
Middle = Collector
Right = Emiiter
I use through hole 2N2222 to fix my Viewsonic N3250 ,and Protron 3250. Both TVs use the power supply made by FSP with similar circuits.
Both power supply have bad caps and bad Q7 and ZD4.
Posted on Jul 01, 2010
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