Proline lcd 32" tv L32D12

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Firmware (Software) update procedure to many popular brand TVs and other devices are given in detail.

Corrupted firmware. A firmware update is necessary. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Firmware upgrade procedure to many TVs and other devices are given with illustrations.

Below is the link for JVC Updates. Software Updates

May be the cord not the port and an update on firmware doesnt fix a hardware issue.

Firmware to HDMI might not be installed. A firmware update is necessary. Contact any service technician.
Gopakumar Gopalan Google

Excuse my English too. It sounds that the firmware to this TV has been corrupted by any way. A firmware update might be necessary. There is booting problem. If you wish to know more abut firmware update, check the site linked below. It has details to firmware update procedure to many brand TVs with illustrations. Beware, you must be sound in electronics to follow. http://electronicshelponline.blogspot.com/ Pull up previous posts there, either by its left side bar, or view it in Timslide option. The site is in English language, but have translation option, which can be pulled out from the right side of the display window.

I think, you have to downgrade the firmware:

get original firmware (I dont'now where) and
use RS232 cable to PC with nullmodem cable

In case "bricked TV" I solved this way it was 32LH3000

Does the Tv have a USB port? If so you should be able to find the firmware on the makers website, assuming the company made a firmware update for that model. If so then download it to a flash drive, zip drive and plug it in to the TV's usb port for the update! Best of Luck!

Go to this link and click on the Download tab. You will find the FirmWare updates there.

http://www.sylvaniaconsumerelectronics.com/product/index.php?id=6

The Philips 32PFL5522D does support firmware upgrades.

Only the digital board can be updated by the user. This is done by downloading the firmware on to a memory card (CF) and inserting into a PCMCIA adaptor. This is then inserted into the CI slot at the back of the TV.

The main TV would have to be updated by a Philips service agent using a COMPAIR device.

However, I don't think the problem you describe is to do with firmware.

You could try altering the following settings:

• Contrast - 65
• Sharpness - 2
• Contrast Plus - OFF
• NR - ON
• Colour - approx 50

If this doesn't help, then the problem is most likely caused by a faulty lead between the LCD panel and driver board. This is a common problem with this model, but should not be an expensive repair.