My Hyundai Q321 will not turn on. No standby lights or anything. I have changed outlets several times and left TV unplugged for long periods of time. Any ideas?

SOUNDS LIKE NEEDS POWER SUPPLY,CALL PANOSNIC CUSTOMER SUPPORT

Plug the power cord directly into a wall power outlet, and make sure that the standby light is lit (turn it on/off manually to see if anything changes). If there isn't any light, then it's most likely broken.
If the TV works again, being plugged into the power outlet in the wall, then the problem is with the cable box (i bet you figured that out too).

There are various reasons for this. Moisture inside the TV, dry solder on boards, dry/leaky capacitors on the board etc. Try changing the power outlet and ensure that it is giving out the voltage required. If nothing works, better refer it to a qualified service technician.

Hi,

The Standby/Power light of the TV blinks when there is any internal malfunction in the TV. The self-diagnostic function of the TV will cause the STANDBY light to blink or flash when the television detects an issue. The number of times the STANDBY light flashes corresponds to a specific issue.

Few examples are given below; some of the issues may be resolved without the need for service.
1 blink / 2 blinks / 5 blinks: - This indicates that there may be a power-related problem with your set.
3 blinks: - This indicates that there may be a power-related problem with your set. The set will need to be serviced to allow a technician to determine the specific issue that needs to be repaired. If the power light flashes three times in sequence in a Lamp TV, the lamp cover is not securely attached. Reattach the lamp cover to resolve this issue.
4 blinks: - This indicates that there may be a back light or lamp power problem.
6 blinks: - This indicates that there is some kind of audio problem with your set.
7 blinks: - This indicates that there is a temperature problem with your set. Please check to make sure that the air vents on the sides and back of the set are not blocked or clogged and there is adequate ventilation around the television. We recommend that you check and clean the vents periodically to make sure the set receives adequate air flow. If the problem continues, the set will need to be serviced.
8 blinks: - This indicates that there may be a video-related problem with your set. If the flash sequence is not listed above or the light continues to flash, follow the steps below to perform a power reset:
Try the following steps to check if the issue can be resolved.
Turn off the television.
Unplug the television power cord from the electrical outlet.
Let the television remain without power for 60 seconds.
Plug the power cord back into the electrical outlet.

If the television is plugged into a power strip or surge protector, remove it from the power strip or surge protector and plug it directly into the wall outlet. If the issue is resolved, the problem is with the power strip or surge protector and not the television.

If the issue continues to occur, service may be required.

Thanks for using Fixya.

There could be few reasons that tv does not power On.
Power supply board got fried, deflection section got bad if its rear projection tv and if its dlp tv, lamp could be dead etc.
Model number and brand of your tv will show us what kind of tv is that to provide you some helpful info about problem.

this a code that mean overvoltage in power supply (+B)

purchased a new tv

The only solution at this point would be to get the power supply repair since new boards are not longer being manufactured. In about 95% of the time if the LCD doesn't power up or turns OFF by itself or need to be unplug for some time to make work again; those are the symptoms of a dying or defective power supply.
I service these power supplies, for more info write to [email protected]

The red light tells me the standby power supply is ok, a technician with a service manual and the proper parts is required to properly troubleshoot other parts of the tv. It could be in the other power supplies or horizontal circuits. This should not be undertaken by a consumer. Tv's are complex devices like computers. Technician: Tim Rasch

I have the same TV. The screen went dead. Turned on the tv and waited for a few minuites for the picture to come on, the light went out. the tv is dead. I am dealing with Hyundai to have it repaired. You have to file a claim on the web site. They contacted me and I had to send them a picture of the Tv. I am waiting for there reply. I had the same problem with a TV i bought my mother. It is a Hisense. I am dealing with them, long time getting back to me. Both tv's sound like they have the same problems, power supply.