Here is my xrandr --verbose about TV1, I thought that maybe it could be of a help:
TV1 connected primary 640x480+640+0 (0xb0) normal (normal left inverted right x axis y axis) 0mm x 0mm
Identifier: 0x43
Timestamp: 4550992
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 1 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
bottom margin: 37
range: (0, 100)
right margin: 46
range: (0, 100)
top margin: 36
range: (0, 100)
left margin: 54
range: (0, 100)
mode: NTSC-M
supported: NTSC-M, NTSC-443, NTSC-J, PAL-M, PAL-N, PAL, 480p, 576p, 720p@60Hz, 720p@50Hz, 1080i@50Hz, 1080i@60Hz
848x480 (0xaf) 29.027MHz +preferred
h: width 848 start 849 end 912 total 944 skew 0 clock 30.75KHz
v: height 480 start 481 end 512 total 513 clock 59.94Hz
640x480 (0xb0) 22.631MHz *current +preferred
h: width 640 start 641 end 704 total 736 skew 0 clock 30.75KHz
v: height 480 start 481 end 512 total 513 clock 59.94Hz
1024x768 (0xb1) 53.773MHz
h: width 1024 start 1025 end 1088 total 1120 skew 0 clock 48.01KHz
v: height 768 start 769 end 800 total 801 clock 59.94Hz
800x600 (0xb2) 33.996MHz
h: width 800 start 801 end 864 total 896 skew 0 clock 37.94KHz
v: height 600 start 601 end 632 total 633 clock 59.94Hz
640x448_59.94 (0xbe) 22.250MHz -HSync +VSync
h: width 640 start 656 end 720 total 800 skew 0 clock 27.81KHz
v: height 448 start 449 end 452 total 464 clock 59.94Hz
Thank you
NOTE: I'm using one of those old CRT TV from before the flat TV hit the market. I have two of those and I still use them for old school games