Are the 3 cables fastened together....or can they be peeled apart from each other, if desired?

They are fastened but can be peeled apart, as I did.

Does this work with samsung flatscreen tv to hook up a dvd

It works for any brand that has RCA input.

This cable has only yellow red white my tv has blue in the back do i need the back

This cable is standard RCA cable (red/white/yellow), you may need a component cable (those are color coded red, blue and green, instead of the the RCA composite cable red, white and yellow). use search term "component cable" within amazon, this should give you the proper cable you are looking for.

ASIN	B00BDYL93Y
Best Sellers Rank	#6,420 in Electronics ( See Top 100 in Electronics ) #74 in RCA Cables
Brand	iMBAPrice
Cable Type	Composite
Color	Black
Compatible Devices	VCD DVD Player TV
Compatible Phone Models	No Compatible Phone Models
Connector Gender	Female-to-Female
Connector Type	3rca to 3rca
Date First Available	October 29, 2012
Indoor/Outdoor Usage	Indoor
Is Discontinued By Manufacturer	No
Item Weight	0.32 ounces
Item model number	3RCA-3RCA-3
Manufacturer	iMBAPrice
Number of Items	1
Number of Pins	6
Product Dimensions	6 x 3.8 x 1 inches
Recommended Uses For Product	Plug and Play, Perfect for Home-Entertainment system such as DVD Player, TV, Camcorder, Set-Top-Box, VCR and other 3RCA-enabled devices.
Shape	Round
Special Feature	Plug and Play. Video (yellow) plus Stereo Audio (red + white).Three different color cord can be split and used separately. That is, the audio cable (red+white) is connected to the speaker, and the video cable (yellow) is connected to the playback device (television, projector, etc.)
Specification Met	RoHS
UPC	616641736668
Unit Count	3 Feet

iMBAPrice 3FT RCA M/Mx3 Audio/Video Cable Gold Plated - Audio Video RCA Stereo Cable 3ft

Details

Description

Specifications

Common Questions