3 digit cade for TELEFUNKEN TLCD-150HDW/R

You can't unless you can find a Source Button on the side of bottom of the set. Just buy a new replacement remote for that set.

$24!

https://www.google.com/search?q=telefunken+tlcd-37fhda+replacement+remote+control

https://www.fixya.com/support/r29872378-universal_remotes_no_facsimile_remote

Remote Control Codes For Telefunken TVs Codes For Universal Remotes

See if any of these work.

If you wish to buy its original remote control, contact the authorized service centre, or authorized dealer to your device brand. They can either give you a genuine remote control to your device, or can direct you, from where can you purchase a suitable one.
To select a proper universal remote control, you should know about the number of digits to its set-up codes. There are 3 digit, 4 digit, 5 digit, 2 digit and even single digit codes, to some brand devices. After confirming this, check the sites linked here. Both the sites have set-up code list and set-up procedure to many popular brand remote controls. Check which brand remote control has set-up code/s to your device brand, and buy that one according to availability. Brand name of the remote control isn't a matter, but it should have set-up codes in its code list, to the device brand you have.
Please note: Every new universal remote control will have set-up code list, and set-up procedure along with its pack. Never accept a remote control, that hasn't both of this. For more details about the set-up codes, visit the sites.
http://electrohelponline.blogspot.com/
http://remotesearch.blogspot.com/
Universal remote controls are available at most of the electronic spare part selling shops. Visit some on-line sites too, which deals with electronic spare parts.
If you wish to get further advice over phone; visit https://www.6ya.com/

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Unlock procedure to many popular brand TVs are given.

need to know name of tv first, then I can give you the code. Good-Day!

JUST GOOGLE THE BRAND OF THE REMOTE AND YOU WILL FIND A CODE FOR IT.

038,019,099,088,000,081,043. Check these codes. If you wish to get more details, check this site. Pull up older posts there. Setup code list and setup proceedings to many popular brand remote controls are given. Three digit, four digit, five digits and two-digit code list are there. Check the site with patience. Surely you'll get a solution to your problem. Search the site by 'Timeslide' option. It will make search easy. Or, type in the brand name to your device into its search box, and press "Enter."

Codes to check are 058,038,049,026. If you wish to get more details to different brands of universal remote controls, check this link.

Since this set like all others with the "child lock" require a code to be entered and the remote is what is used, I would say it cannot be done without the correct remote and the password.

Without its remote control, you can't unlock this TV.