Question about Projection Televisions
I have a two year old DAYTEK DT3220 LCD TV. When powered on with remote or front button, it goes green for about 1/4 seconds, and then flashes 4 more times (staying dim gren aftewards).
When one turns it off, the backlight comes on for an instant and the picture in picture box is visible on the lower right of the screen.
I've checked the power supply (these models are famous for problems with it) but am showing a solid 5, 12 and 24 volts on the outputs.
Anyone able to advise me what to look at next ?
The power supply voltages might look good on an oscilliscope or using a
DC meter, but that doesn't really tell you if the supply is good.
Your TV has an unusual symptom, however 99% of the problems on these TVs are caused by the power supply. I have had 3220s that won't power on, the remote or controls on the TV won't work, or the unit blanks out and all sorts of other odd problems. The power supply can test fine, but if you substitute it the TV will work fine.
Sorry to say you're up a creek. The good news is that just about any 5,12,24V power supply for a 32:" TV will work if you are comfortable rewiring the connectors. I have done this a few times and rescued the TVs from an early grave (I'm actually just about to start on another one now). The pinout is written on the board, and make sure the power supply you want to use also has the pinouts marked on the board.
Posted on Jul 22, 2009
Does anybody have a drawing of this inverter circut using the 74LS04 to invert the enable circut?
Posted on Jul 18, 2010
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