20 Most Recent Toshiba REGZA 42WLG66 42 in. HD-Ready LCD Television - Page 8 Questions & Answers

More likely to have somting shorted out in the power supply or in the backlight inverter board. Right now the 5vdc standby power supply is working but not the rest.
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
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

Hello,

its the problem of overheating in the power supply board of the TV.on the power supply board of the TV there are few capacitors and IC.any of this IC is got short or may be weak.so due to this when you start the TV the current passes from electric outlet to the power supply board of TV.but when the current passes from that weak/faulty part at that time current gets stopped or slow and the board overheats and TV shuts off. this is a common problem faced by many other users too.the possible option to solve this issue is to check the power supply board by a meter and continuity tester and replace the faulty component on the board which is short due to which power supply board is getting overheated.its bit technical job but yes its not at all a costly repair to do or get it done by the technician. for required parts it can be easily available from local electronic hardware shop.
This will help.

You question your existence, a common question to which the answer you will find within yourself.

Must take the tv aparts,check the side manaul control board functions,check the controls board out.Tries websites like Partstore.com Shopjimmy.com,Ebay.com to buy a refurbish manual power switch board for the replament.

The screen can be replaced.

It can be the LCD panel (worst case) or the T-CON board. Need to see the pictures of the screen to be moare help ([email protected]). See if it looks like what I have shown in the picture of bad LCD panel.
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

Does the picture flickers show up few sec.than dies,than have sound left only.Yes,than the 1 or 2 long LCD inverter boards are dead.Tries websites like Shopjimmy.com,Ebay.com to buy those long 1 or 2 inverter boards for the replacement.

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

No picture and no sound, first place to look will be the power supply module. Need to verify that all the voltages are present.
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

a power surge can over load the electronics, {cooking them}so most lickely the set is burnt out ,sorry

Unplug it for about an hour to see if it will reset, otherwise look for mian AC located close to where the power comes in.
If you are going to DIY and have proper tools 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

You may have failing T-CON board or it is not getting clean 12vdc feeding it.
If you are going to DIY and have proper tools 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

Not my solution but a copy from another problem.  Rate me  =]

"The problem is with the signal board. Basically, it is not allowing the power signal to go from the on button from the set or the remote to the TV. I am having the exact same problem with my 42" LCD Regza. Currently, if you are under warranty, Toshiba does not have these in stock. They will not have them available to send until early January. My TV has been at the repair shop since December 4th. I am very upset as I won't be able to watch the bowl games in HD. If your set is still under warranty then call Toshiba help line at 800-575-5469. You will need the model number of yout TV that is listed on the front of the owner's manual. They are:
27HL67
32HL67
32HL67U
37HL67
42HL67

The first number will be the giveaway as to which model you have. It is the size of your set. They will ask you to try a hard reset. (Hold pwer button down for 5 seconds until you see the yellow light go solid and go off.) This will most likely not work. If it does, you are lucky. I found that if you unplug the TV for an extened period of time, ie overnight, ity may come back on. It will eventually give out completely though. Better to get the problem addressed with the manufacturer. If you are not under warranty then I do not know what to tell you. Right now I am searching the internet to see if I can find this part to maybe purchase myself. Only if it is not too costly. If I find anything I will post here for all. If you have any questions, feel free to email me a [email protected] and I might be able to give you more details on your problem. Good Luck.
WJ"

Quoted From  
http://www.fixya.com/support/t1070173-yellow_light_blinking_blank_screen_turn

Nick

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

does it have an AV or INPUT button on the remote

if so connect your dvd and scroll through these inputs

hope this helps if not email
[email protected] and i will help

It must have switched the input
try pushing the input button until you get back to something with a picture
usually the blue screen indicates an input with "no video" and we just need to flip back to one with video
let me know if this works or not so I can further assist you

if it doesn't work, try pressing the menu button and see if you can see the menu, if not something may have malfunctioned.

more likely bad caps in power

good day just go to Toshiba service center.all parts you need have them all.

just contact your dealer and buy a board for replacement of your defective parts

Check out the main AC fuse and may be the MOV for surge protection in the power supply module.

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
Parts: www.shopjimmy.com