GOODMANS GTVL26W26HDF - no Remote control/child lock is locked!!

No idea if any of the suggestions below will work.

https://quuq.org/forum/index.php?topic=3408.0

https://www.avforums.com/threads/goodmans-ld1510-on-child-lock.812276/

Several postings on the internet found using https://www.google.com did not suggest a certain answer. Please use Comment menu to update your question if you find a way that works for you, or you want to report back on what you have tried already.

In this case, it will be best to contact the authorized service center for Goodmans.
http://electronicshelponline.blogspot.com/

To open its child lock, you might have its original remote control. Try these methods. Locate the manual for your television. Though slightly embarrassing, accidentally turning on the child lock to a TV is a common problem. The section In the manual about how to set the child lock feature will also explain how to unlock it.
Try a few "universal methods" for unlocking the child lock. Some televisions have a universal code built in for disabling the child lock --no matter what your code is. A common code is "0000."
Unplug your television for a few minutes. The internal battery of the TV is what helps remember what your code. If the TV is unplugged for an extended period of time, it clears the internal memory, which in turn will reset your child lock code.
If you wish to buy its original remote control, you have to contact the authorized service center. If you wish to buy a universal remote control, you should know about, which brand remote control have setup code to your TV/device brand. You should first make sure about the number of digits in the codes to your device have. There are 3-digit, 4-digit, 5-digit and even 2-digit codes. You can get this detail by the code list attached to every universal remote control. The brand name of the remote control you select isn't a matter; but, its code list should have setup codes to your TV/device brand, otherwise you can't set it up with your device. Check this link and note which brand remote control have set-up codes to your device brand, and buy that brand remote control, according to availability.

Power it off for 5 mins, and hit the power button

Yes,ur tv does require a tv orginal remote will help u to used,but the child lock mode must have a secret codes to enter it.Can't turn tv on,must have the tv original remote to enter child lock secret codes though.Tries Goodmans website look for there 1-800.. call ask their customer service they can help to erase the child lock secrect password,if u don't know it.Try website Remotes.com to buy the tv original remote.

Hi what you can do is to buy a universal remote control for this TV to remove the child lock. You can get that online or on any electronic shops in your area. Once done here is the instructions on how to remove the child lock using remote.
Look at the "Power" indicator light on the front of the television to check if it is blinking. When blinking, the child lock is enabled. You can also check by pressing the "Power" button on the television.
Point the remote control at the television and press one of the buttons on the number keypad. The "Power" indicator light will stop blinking, indicating the child lock is turned off.
Lock the television again by pressing and holding the "Power" button on the remote control until the indicator light starts blinking. It takes approximately three seconds before the light turns on. Thanks

The power button on the TV doesn't work because of the child lock?
I went over the copy of your manual for your TV. It must be the child lock timer problem.
I would try leaving the TV unplugged for 30 mins and see if that reset the TV and releases the lock.
If it doesn't work, the remote needs to be replaced. A universal remotes aren't really universal when you need to use special buttons. The remote made for the TV is the best.
If your TV is the model 47PFL7403D, here's the cheapest place to buy a replacement.
http://www.philips.newremotecontrol.com/catalog_item.php?catnum=313922852812

Unfortunately the Child Lock facility disables the buttons on the TV.

You should be able to get a replacement remote control from an authorised Philips dealer, or you could try a universal remote control form most electrical retailers. Philips make a range of universal remote controls.

Instructions for activating and de-activating the child lock are in the manual. If you don't have the manual, download it here:

https://www.p4c.philips.com/files/2/27ms343s/27ms343s_dfu_aen.pdf

my remote control doesn't work, and i can turn the tv on because i lock to just use with the remote control. How can turn the tv on if i do not have a remote control?

To unlock the Panel Lock, Parent Lock, or Child Lock, follow these steps:

1. Turn on your TV.
2. On the remote, press the Menu button. The Set-Up Menu appears.
3. Scroll to the Key Lock function and set function to Off.
4. Press the Exit button to exit.

Note: If you don't have a remote, you may be able to do the same thing by pressing the Menu button on the front or side panel of your TV and using the volume or channel up and down buttons on the TV to scroll to the Key Lock function and set it to Off.