what are the codes to the devices

You can view the manual that includes the codes here: http://www.manualslib.com/manual/422649/Rca-Rcr503br.html

will this work for an LG tv?

Yes here is a link to all the TV's the remote is compatible with http://www.voxxintlcorp.com/docs/common/RCR504BR/RCR504BR_OTHER_CL.pdf

seems to be mixed info on if this will work with old receivers? I have a sony str-d590 that i want to control

Go to RCA's website, download the digital copy of the manual, and look for your particular old receiver. My TV wasn't specifically listed, but there were 4 codes for the brand. The first one worked. Based on my personal experience, I think it will probably work. But, you know, it is only about $7, live dangerously and take a chance!

Brand	RCA
Manufacturer	RCA
Model	RCR503BE
Model Name	RCR503BE
Model Year	2013
Product Dimensions	11.43 x 3.81 x 27.94 cm; 110 g
Batteries	2 AA batteries required.
Item model number	RCR503BE
Hardware Platform	television
Colour Screen	No
Power Source	Battery Powered
Battery Description	Alkaline
Batteries Included	No
Batteries Required	Yes
Connector Type	Infrared
Device interface - primary	Keypad
Does it contain liquid?	No
Includes Rechargeable Battery	No
Manufacturer	RCA
Country of Origin	USA
Item Weight	110 g

RCA RCR503BZ 3-Device Palm-Sized Universal Remote

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