Black box comes up on tv screen

Look for a retailer near your place by searching in google.

what were you cap values on the power supply thet you replaced?

is very simple u have active the close caption mode on ur remote control , this happen sometimes , on ur remote control look for a botton that it said cc or caption or cc mode press this botton till it said on the screen on ur tv cc off or u would see c1 , c2 but u whanto have the one that it said off and that would fix this black box on ur screen

You may have blown power supply for the backlight inverter or blown backlight inverter board, either one are cheap!,
This is cheaply made TV to begin with. Repiar shop will charge you $200 and up plus parts.
http://www.shopjimmy.com/catalogsearch/result/index/?q=Polaroid+TDA-03211C+&limit=100&p=2

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Please post back what you find.

that is probly the closed captio is on get to your menu and turned off..
hope that help

just talked to polaroid because mine did the same thing......... power light is on and when you first power it on..... the polaroid screen appears for a second and then goes out............. they told me it sound like the control box and would cost me 225.00 to have it fixed............. does anyone know how to get a control box from some one other than polaroid....
my tv is TDA-03211C 32 inch with built in DVD

Is your closed caption selected? I saw the same problem with my friend's Sansui HDTV.

With the dvd loaders in these particular units the laser tends to fault in them relatively fast. Replace the laser loader assembly, which is the entire assembly containing the laser, the mechanism where the disc slides in and out as well as the small motor that spins the disc. Good Luck.

Sounds like the DVD player is defective. Just food for thought.. Try not invest in any make with a built in DVD player, they just don't last.

sounds like inverter board. What it sounds like is happing is your LCD is working ut the backligkt board that allows you to see is kicking off. (as you still have sound) Which could be the (most likely) inverter board, or the power supply board. You can take apart and check for voltage at your power supply. The power supply has a pigtail with large white wires and a connector. Power up with the center back cover off and check your voltage at the white connector on the power supply before and after the screen gos out. If there is no large voltage loss it is your inverter board.

You can used boards on e-bay or
www.rns-systems.com