Leave it unplugged for an hour and try again. Use the remote to turn it on. If the power button doesn't work then you may need the remote .
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
SOURCE: i have a dynex
Major hardware failure - a component inside your tv has failed and it has sent the power source in protected mode. Normally the status light should have flashed/blinked an error code - if that doesn't happen then the defect is either in the processor of the tv or in the power source.
To find out which you must open the tv and check the power source (including the ballast) first - the most common problem there are the capacitors. Follow this to fix that
http://www.youtube.com/watch?v=YCSNWi3UHf4
then check the output voltages. If everything appears normally then the processor has failed. In that case the only thing left to do is to replace the mainboard
http://www.mcmelectronics.com/product/DYNEX-756TQ9CBZK21204-/756TQ9CBZK21202
All that requires at least a basic experience with electronics - you need to know how to solder. Otherwise you will need to take the tv to a repair shop.
SOURCE: dynex model dx-l24-10a no red
First thing to know is if you are using the component input on back of set (red,blue,green) to make sure red plug at both ends is all the way in.
If hooked another way or using a box or not let me know.
SOURCE: dynex dx l-32 won't power up
I see so many here with no sound/no picture issues:
ISSUES:
1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signs of damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down the problem.
4. Be safe and if you do not know what you are doing don't open the set.
Answers to issues:
1. RE:fuses---if a blown fuse is found get a good replacement(not the generic ones like Radio Shack). Many fuses are special even aside from amperage--Don't put a higher rated amperage fuse in the set for any reason.
2. RE: power supply in set: if total dead aside from main fuse the set uses a standby power supply that runs 7/24 and a main supply (some are combined and some not.
Here aside from checking fuses you want to examine all the filter caps on the power/standby to see if any are puffed up or buldged up in some fashion--I attach a photo of a good one---top should be silver metal and PERFECTLY flat and have no brown material coming out on top or bottom.
What happens in the standby area is they use caps with too low a voltage rating (saves money) which causes them to fail in a year or two---the standby runs 7/24 and the heat dries out the caps and they fail.
3. Trouble shooting consists of the above and then at some point you have to buy and try a board to see if it fixes it or not.
4. Safety first--no TV set is worth getting injured or even killed over. If set is opened at least look for puffed up and bad caps like in this photo.
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