Question about ViewSonic N3250W Television
I have an issue where the tv status light will come on, but there will be no display. After a few seconds the tv seems to produce a soft high pitch squeel, that seems to be coming from the vicinity of the power supply board - which is a Darfon 4H.B0280.001 / C2 board... In talking with viewsonic support they thought it "might" be the B-00005963 power supply, but not %100 sure.
I have the back panel taken of and looked at the power board, but nothing looks toasted. I found that there is actually current flowing through the heat sink on this board when the switch is engaged (learned this the hard way)......
Does anyone have the service manual for this or have any ideas on what to do to trouble shoot?
The power suppy no works no good the capacitors no good
Posted on Sep 14, 2008
You have to make sure the power supply works.first make sure there is no current flowing to the circuit disconnect it from the power source.then use the multimeter to diagnose all the diodes at secondary power supply.if there is any that has loose the value or connecting direct replace it if not check the transistor that is at the fly back contact me at email@example.com if not successful
Posted on Sep 03, 2008
At first my tv would work for about 8 hours, then the backlight and audio would die. The light stays green like it is on. now it will work for an hour before it does it. I'm guessing it is the related to this problem. On the viewsonic store they have the PSU board, However it is out of stock. If you can get them to send you the part It is an extremely easy fix. As soon as I find a power supply I'm going to see if works.
Posted on Jan 07, 2008
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