My computer doesn't recognize the monitor's resolution on some VGA cables, what's going on?
up vote
2
down vote
favorite
My Mac doesn't recognize my TV's resolution on (so far) 3 VGA cables I've tried but it works just fine using other seemingly old VGA cables. My roommate had the same experience on Mint Linux.
What's the difference between VGA cables? What should I look for in a VGA cable that I buy? Are those still being made?
display macbook vga cable external-display
add a comment |
up vote
2
down vote
favorite
My Mac doesn't recognize my TV's resolution on (so far) 3 VGA cables I've tried but it works just fine using other seemingly old VGA cables. My roommate had the same experience on Mint Linux.
What's the difference between VGA cables? What should I look for in a VGA cable that I buy? Are those still being made?
display macbook vga cable external-display
TVs don't commonly have VGA, and I've generally had to set it manually. What sort of Mac? Macs haven't had VGA out in years so what sort of adaptors are you using?
– Journeyman Geek♦
Jul 21 '15 at 2:51
@JourneymanGeek It's a 3-year-old Samsung TV, relatively low-end. It has an HDMI port which I use for my RPi and a VGA port that I use for my 2013 MacBook Air. I have an Apple adapter to convert I believe display port to VGA.
– Leo Jweda
Jul 21 '15 at 2:53
I half suspect the adaptor may come into play. I'd also add, as of 2015, no major computer manufacturer is supporting VGA and DVI, so chances are those cables will stop being made in a few years. You can still find some systems with support, but in general dp's the preferred standard for Monitors, and HDMI for TVs. PCs will output both, of course.
– Journeyman Geek♦
Jul 21 '15 at 3:14
@JourneymanGeek Like I said, in the exact same setup, with the exact same adapters, some cables work and other don't. It most definitely NOT the adapter. Cute dog BTW.
– Leo Jweda
Jul 21 '15 at 3:17
add a comment |
up vote
2
down vote
favorite
up vote
2
down vote
favorite
My Mac doesn't recognize my TV's resolution on (so far) 3 VGA cables I've tried but it works just fine using other seemingly old VGA cables. My roommate had the same experience on Mint Linux.
What's the difference between VGA cables? What should I look for in a VGA cable that I buy? Are those still being made?
display macbook vga cable external-display
My Mac doesn't recognize my TV's resolution on (so far) 3 VGA cables I've tried but it works just fine using other seemingly old VGA cables. My roommate had the same experience on Mint Linux.
What's the difference between VGA cables? What should I look for in a VGA cable that I buy? Are those still being made?
display macbook vga cable external-display
display macbook vga cable external-display
asked Jul 21 '15 at 1:42
Leo Jweda
1135
1135
TVs don't commonly have VGA, and I've generally had to set it manually. What sort of Mac? Macs haven't had VGA out in years so what sort of adaptors are you using?
– Journeyman Geek♦
Jul 21 '15 at 2:51
@JourneymanGeek It's a 3-year-old Samsung TV, relatively low-end. It has an HDMI port which I use for my RPi and a VGA port that I use for my 2013 MacBook Air. I have an Apple adapter to convert I believe display port to VGA.
– Leo Jweda
Jul 21 '15 at 2:53
I half suspect the adaptor may come into play. I'd also add, as of 2015, no major computer manufacturer is supporting VGA and DVI, so chances are those cables will stop being made in a few years. You can still find some systems with support, but in general dp's the preferred standard for Monitors, and HDMI for TVs. PCs will output both, of course.
– Journeyman Geek♦
Jul 21 '15 at 3:14
@JourneymanGeek Like I said, in the exact same setup, with the exact same adapters, some cables work and other don't. It most definitely NOT the adapter. Cute dog BTW.
– Leo Jweda
Jul 21 '15 at 3:17
add a comment |
TVs don't commonly have VGA, and I've generally had to set it manually. What sort of Mac? Macs haven't had VGA out in years so what sort of adaptors are you using?
– Journeyman Geek♦
Jul 21 '15 at 2:51
@JourneymanGeek It's a 3-year-old Samsung TV, relatively low-end. It has an HDMI port which I use for my RPi and a VGA port that I use for my 2013 MacBook Air. I have an Apple adapter to convert I believe display port to VGA.
– Leo Jweda
Jul 21 '15 at 2:53
I half suspect the adaptor may come into play. I'd also add, as of 2015, no major computer manufacturer is supporting VGA and DVI, so chances are those cables will stop being made in a few years. You can still find some systems with support, but in general dp's the preferred standard for Monitors, and HDMI for TVs. PCs will output both, of course.
– Journeyman Geek♦
Jul 21 '15 at 3:14
@JourneymanGeek Like I said, in the exact same setup, with the exact same adapters, some cables work and other don't. It most definitely NOT the adapter. Cute dog BTW.
– Leo Jweda
Jul 21 '15 at 3:17
TVs don't commonly have VGA, and I've generally had to set it manually. What sort of Mac? Macs haven't had VGA out in years so what sort of adaptors are you using?
– Journeyman Geek♦
Jul 21 '15 at 2:51
TVs don't commonly have VGA, and I've generally had to set it manually. What sort of Mac? Macs haven't had VGA out in years so what sort of adaptors are you using?
– Journeyman Geek♦
Jul 21 '15 at 2:51
@JourneymanGeek It's a 3-year-old Samsung TV, relatively low-end. It has an HDMI port which I use for my RPi and a VGA port that I use for my 2013 MacBook Air. I have an Apple adapter to convert I believe display port to VGA.
– Leo Jweda
Jul 21 '15 at 2:53
@JourneymanGeek It's a 3-year-old Samsung TV, relatively low-end. It has an HDMI port which I use for my RPi and a VGA port that I use for my 2013 MacBook Air. I have an Apple adapter to convert I believe display port to VGA.
– Leo Jweda
Jul 21 '15 at 2:53
I half suspect the adaptor may come into play. I'd also add, as of 2015, no major computer manufacturer is supporting VGA and DVI, so chances are those cables will stop being made in a few years. You can still find some systems with support, but in general dp's the preferred standard for Monitors, and HDMI for TVs. PCs will output both, of course.
– Journeyman Geek♦
Jul 21 '15 at 3:14
I half suspect the adaptor may come into play. I'd also add, as of 2015, no major computer manufacturer is supporting VGA and DVI, so chances are those cables will stop being made in a few years. You can still find some systems with support, but in general dp's the preferred standard for Monitors, and HDMI for TVs. PCs will output both, of course.
– Journeyman Geek♦
Jul 21 '15 at 3:14
@JourneymanGeek Like I said, in the exact same setup, with the exact same adapters, some cables work and other don't. It most definitely NOT the adapter. Cute dog BTW.
– Leo Jweda
Jul 21 '15 at 3:17
@JourneymanGeek Like I said, in the exact same setup, with the exact same adapters, some cables work and other don't. It most definitely NOT the adapter. Cute dog BTW.
– Leo Jweda
Jul 21 '15 at 3:17
add a comment |
3 Answers
3
active
oldest
votes
up vote
6
down vote
accepted
As @Wyzard says, computers talk to monitors via DDC and this uses 4 pins on the vga.
See the pinout on wikipedia.
A working vga cable needs all the pins wired independently from each, and also from the cable shielding
to the chassis, i.e the metal cover of the plugs and sockets. Only pins 4 and 11 can be missing or not cabled.
Inside a monitor there is a small eprom holding information on the monitor's resolutions (the EDID). This
eprom is accessible even when the monitor is powered off, as it is
independently powered from the computer by 5 volts on pin 9, with ground on pins 10 and 5.
The eprom is read using i2c clock and data signals on pins 12 and 15.
These days with DDC, the i2c bus can do other things too.
The analogue video signals on pins 1, 2, 3 have independent analogue ground on 6, 7, and 8.
Some bad vga cables will not have these analogue grounds, nor the i2c ground, and assume the cable shielding
will do. This often does not work.
The only way to check vga cables is with a continuity tester (multimeter) ensuring that all pins are wired
through, and none are in common, including the shield.
Update: I got a C2G cable that works. Thanks.
– Leo Jweda
Jul 24 '15 at 3:41
add a comment |
up vote
4
down vote
Detecting a monitor's resolution depends on information provided by the monitor itself via DDC. In a VGA cable, this uses several pins and wires that are separate from the ones used for the actual video signal.
A cheap VGA cable might be missing some of these wires (to save on costs), or the wire might be present but broken (due to wear & tear).
1
How do I find a cable that has all the wires? I tried cheap ones from Amazon and a $20+ one from a brick and mortar store and none of them worked. The only ones that have worked are old ones for some reason.
– Leo Jweda
Jul 21 '15 at 2:54
Don't know, sorry. I've never encountered a cable with that problem, but I haven't used VGA cables in a long time.
– Wyzard
Jul 21 '15 at 3:18
add a comment |
up vote
0
down vote
Simple Answer, stop using VGA cables, use HDMI or DisplayPort
Long answer: well quality and length of vga cables has alot to say about resolution
1
I'm aware of the drawbacks of using VGA cables but my current setup requires me to use one. I highly doubt it's length because I've tried different lengths and that did not seem to have an effect on the quality. After all, my setup only requires about 2 feet.
– Leo Jweda
Jul 21 '15 at 2:11
However, note that a quality VGA (and most other kinds of) cable need not cost a fortune nor have gold plated pens. The important factors are being wired-properly with the right gauge wire, and being shielded.
– martineau
Jul 21 '15 at 9:29
length also plays a big role, longer cables will lose signals
– nwgat
Jul 21 '15 at 10:00
add a comment |
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
6
down vote
accepted
As @Wyzard says, computers talk to monitors via DDC and this uses 4 pins on the vga.
See the pinout on wikipedia.
A working vga cable needs all the pins wired independently from each, and also from the cable shielding
to the chassis, i.e the metal cover of the plugs and sockets. Only pins 4 and 11 can be missing or not cabled.
Inside a monitor there is a small eprom holding information on the monitor's resolutions (the EDID). This
eprom is accessible even when the monitor is powered off, as it is
independently powered from the computer by 5 volts on pin 9, with ground on pins 10 and 5.
The eprom is read using i2c clock and data signals on pins 12 and 15.
These days with DDC, the i2c bus can do other things too.
The analogue video signals on pins 1, 2, 3 have independent analogue ground on 6, 7, and 8.
Some bad vga cables will not have these analogue grounds, nor the i2c ground, and assume the cable shielding
will do. This often does not work.
The only way to check vga cables is with a continuity tester (multimeter) ensuring that all pins are wired
through, and none are in common, including the shield.
Update: I got a C2G cable that works. Thanks.
– Leo Jweda
Jul 24 '15 at 3:41
add a comment |
up vote
6
down vote
accepted
As @Wyzard says, computers talk to monitors via DDC and this uses 4 pins on the vga.
See the pinout on wikipedia.
A working vga cable needs all the pins wired independently from each, and also from the cable shielding
to the chassis, i.e the metal cover of the plugs and sockets. Only pins 4 and 11 can be missing or not cabled.
Inside a monitor there is a small eprom holding information on the monitor's resolutions (the EDID). This
eprom is accessible even when the monitor is powered off, as it is
independently powered from the computer by 5 volts on pin 9, with ground on pins 10 and 5.
The eprom is read using i2c clock and data signals on pins 12 and 15.
These days with DDC, the i2c bus can do other things too.
The analogue video signals on pins 1, 2, 3 have independent analogue ground on 6, 7, and 8.
Some bad vga cables will not have these analogue grounds, nor the i2c ground, and assume the cable shielding
will do. This often does not work.
The only way to check vga cables is with a continuity tester (multimeter) ensuring that all pins are wired
through, and none are in common, including the shield.
Update: I got a C2G cable that works. Thanks.
– Leo Jweda
Jul 24 '15 at 3:41
add a comment |
up vote
6
down vote
accepted
up vote
6
down vote
accepted
As @Wyzard says, computers talk to monitors via DDC and this uses 4 pins on the vga.
See the pinout on wikipedia.
A working vga cable needs all the pins wired independently from each, and also from the cable shielding
to the chassis, i.e the metal cover of the plugs and sockets. Only pins 4 and 11 can be missing or not cabled.
Inside a monitor there is a small eprom holding information on the monitor's resolutions (the EDID). This
eprom is accessible even when the monitor is powered off, as it is
independently powered from the computer by 5 volts on pin 9, with ground on pins 10 and 5.
The eprom is read using i2c clock and data signals on pins 12 and 15.
These days with DDC, the i2c bus can do other things too.
The analogue video signals on pins 1, 2, 3 have independent analogue ground on 6, 7, and 8.
Some bad vga cables will not have these analogue grounds, nor the i2c ground, and assume the cable shielding
will do. This often does not work.
The only way to check vga cables is with a continuity tester (multimeter) ensuring that all pins are wired
through, and none are in common, including the shield.
As @Wyzard says, computers talk to monitors via DDC and this uses 4 pins on the vga.
See the pinout on wikipedia.
A working vga cable needs all the pins wired independently from each, and also from the cable shielding
to the chassis, i.e the metal cover of the plugs and sockets. Only pins 4 and 11 can be missing or not cabled.
Inside a monitor there is a small eprom holding information on the monitor's resolutions (the EDID). This
eprom is accessible even when the monitor is powered off, as it is
independently powered from the computer by 5 volts on pin 9, with ground on pins 10 and 5.
The eprom is read using i2c clock and data signals on pins 12 and 15.
These days with DDC, the i2c bus can do other things too.
The analogue video signals on pins 1, 2, 3 have independent analogue ground on 6, 7, and 8.
Some bad vga cables will not have these analogue grounds, nor the i2c ground, and assume the cable shielding
will do. This often does not work.
The only way to check vga cables is with a continuity tester (multimeter) ensuring that all pins are wired
through, and none are in common, including the shield.
answered Jul 21 '15 at 7:27
meuh
3,3601920
3,3601920
Update: I got a C2G cable that works. Thanks.
– Leo Jweda
Jul 24 '15 at 3:41
add a comment |
Update: I got a C2G cable that works. Thanks.
– Leo Jweda
Jul 24 '15 at 3:41
Update: I got a C2G cable that works. Thanks.
– Leo Jweda
Jul 24 '15 at 3:41
Update: I got a C2G cable that works. Thanks.
– Leo Jweda
Jul 24 '15 at 3:41
add a comment |
up vote
4
down vote
Detecting a monitor's resolution depends on information provided by the monitor itself via DDC. In a VGA cable, this uses several pins and wires that are separate from the ones used for the actual video signal.
A cheap VGA cable might be missing some of these wires (to save on costs), or the wire might be present but broken (due to wear & tear).
1
How do I find a cable that has all the wires? I tried cheap ones from Amazon and a $20+ one from a brick and mortar store and none of them worked. The only ones that have worked are old ones for some reason.
– Leo Jweda
Jul 21 '15 at 2:54
Don't know, sorry. I've never encountered a cable with that problem, but I haven't used VGA cables in a long time.
– Wyzard
Jul 21 '15 at 3:18
add a comment |
up vote
4
down vote
Detecting a monitor's resolution depends on information provided by the monitor itself via DDC. In a VGA cable, this uses several pins and wires that are separate from the ones used for the actual video signal.
A cheap VGA cable might be missing some of these wires (to save on costs), or the wire might be present but broken (due to wear & tear).
1
How do I find a cable that has all the wires? I tried cheap ones from Amazon and a $20+ one from a brick and mortar store and none of them worked. The only ones that have worked are old ones for some reason.
– Leo Jweda
Jul 21 '15 at 2:54
Don't know, sorry. I've never encountered a cable with that problem, but I haven't used VGA cables in a long time.
– Wyzard
Jul 21 '15 at 3:18
add a comment |
up vote
4
down vote
up vote
4
down vote
Detecting a monitor's resolution depends on information provided by the monitor itself via DDC. In a VGA cable, this uses several pins and wires that are separate from the ones used for the actual video signal.
A cheap VGA cable might be missing some of these wires (to save on costs), or the wire might be present but broken (due to wear & tear).
Detecting a monitor's resolution depends on information provided by the monitor itself via DDC. In a VGA cable, this uses several pins and wires that are separate from the ones used for the actual video signal.
A cheap VGA cable might be missing some of these wires (to save on costs), or the wire might be present but broken (due to wear & tear).
answered Jul 21 '15 at 2:47
Wyzard
5,62822123
5,62822123
1
How do I find a cable that has all the wires? I tried cheap ones from Amazon and a $20+ one from a brick and mortar store and none of them worked. The only ones that have worked are old ones for some reason.
– Leo Jweda
Jul 21 '15 at 2:54
Don't know, sorry. I've never encountered a cable with that problem, but I haven't used VGA cables in a long time.
– Wyzard
Jul 21 '15 at 3:18
add a comment |
1
How do I find a cable that has all the wires? I tried cheap ones from Amazon and a $20+ one from a brick and mortar store and none of them worked. The only ones that have worked are old ones for some reason.
– Leo Jweda
Jul 21 '15 at 2:54
Don't know, sorry. I've never encountered a cable with that problem, but I haven't used VGA cables in a long time.
– Wyzard
Jul 21 '15 at 3:18
1
1
How do I find a cable that has all the wires? I tried cheap ones from Amazon and a $20+ one from a brick and mortar store and none of them worked. The only ones that have worked are old ones for some reason.
– Leo Jweda
Jul 21 '15 at 2:54
How do I find a cable that has all the wires? I tried cheap ones from Amazon and a $20+ one from a brick and mortar store and none of them worked. The only ones that have worked are old ones for some reason.
– Leo Jweda
Jul 21 '15 at 2:54
Don't know, sorry. I've never encountered a cable with that problem, but I haven't used VGA cables in a long time.
– Wyzard
Jul 21 '15 at 3:18
Don't know, sorry. I've never encountered a cable with that problem, but I haven't used VGA cables in a long time.
– Wyzard
Jul 21 '15 at 3:18
add a comment |
up vote
0
down vote
Simple Answer, stop using VGA cables, use HDMI or DisplayPort
Long answer: well quality and length of vga cables has alot to say about resolution
1
I'm aware of the drawbacks of using VGA cables but my current setup requires me to use one. I highly doubt it's length because I've tried different lengths and that did not seem to have an effect on the quality. After all, my setup only requires about 2 feet.
– Leo Jweda
Jul 21 '15 at 2:11
However, note that a quality VGA (and most other kinds of) cable need not cost a fortune nor have gold plated pens. The important factors are being wired-properly with the right gauge wire, and being shielded.
– martineau
Jul 21 '15 at 9:29
length also plays a big role, longer cables will lose signals
– nwgat
Jul 21 '15 at 10:00
add a comment |
up vote
0
down vote
Simple Answer, stop using VGA cables, use HDMI or DisplayPort
Long answer: well quality and length of vga cables has alot to say about resolution
1
I'm aware of the drawbacks of using VGA cables but my current setup requires me to use one. I highly doubt it's length because I've tried different lengths and that did not seem to have an effect on the quality. After all, my setup only requires about 2 feet.
– Leo Jweda
Jul 21 '15 at 2:11
However, note that a quality VGA (and most other kinds of) cable need not cost a fortune nor have gold plated pens. The important factors are being wired-properly with the right gauge wire, and being shielded.
– martineau
Jul 21 '15 at 9:29
length also plays a big role, longer cables will lose signals
– nwgat
Jul 21 '15 at 10:00
add a comment |
up vote
0
down vote
up vote
0
down vote
Simple Answer, stop using VGA cables, use HDMI or DisplayPort
Long answer: well quality and length of vga cables has alot to say about resolution
Simple Answer, stop using VGA cables, use HDMI or DisplayPort
Long answer: well quality and length of vga cables has alot to say about resolution
answered Jul 21 '15 at 2:03
nwgat
8081811
8081811
1
I'm aware of the drawbacks of using VGA cables but my current setup requires me to use one. I highly doubt it's length because I've tried different lengths and that did not seem to have an effect on the quality. After all, my setup only requires about 2 feet.
– Leo Jweda
Jul 21 '15 at 2:11
However, note that a quality VGA (and most other kinds of) cable need not cost a fortune nor have gold plated pens. The important factors are being wired-properly with the right gauge wire, and being shielded.
– martineau
Jul 21 '15 at 9:29
length also plays a big role, longer cables will lose signals
– nwgat
Jul 21 '15 at 10:00
add a comment |
1
I'm aware of the drawbacks of using VGA cables but my current setup requires me to use one. I highly doubt it's length because I've tried different lengths and that did not seem to have an effect on the quality. After all, my setup only requires about 2 feet.
– Leo Jweda
Jul 21 '15 at 2:11
However, note that a quality VGA (and most other kinds of) cable need not cost a fortune nor have gold plated pens. The important factors are being wired-properly with the right gauge wire, and being shielded.
– martineau
Jul 21 '15 at 9:29
length also plays a big role, longer cables will lose signals
– nwgat
Jul 21 '15 at 10:00
1
1
I'm aware of the drawbacks of using VGA cables but my current setup requires me to use one. I highly doubt it's length because I've tried different lengths and that did not seem to have an effect on the quality. After all, my setup only requires about 2 feet.
– Leo Jweda
Jul 21 '15 at 2:11
I'm aware of the drawbacks of using VGA cables but my current setup requires me to use one. I highly doubt it's length because I've tried different lengths and that did not seem to have an effect on the quality. After all, my setup only requires about 2 feet.
– Leo Jweda
Jul 21 '15 at 2:11
However, note that a quality VGA (and most other kinds of) cable need not cost a fortune nor have gold plated pens. The important factors are being wired-properly with the right gauge wire, and being shielded.
– martineau
Jul 21 '15 at 9:29
However, note that a quality VGA (and most other kinds of) cable need not cost a fortune nor have gold plated pens. The important factors are being wired-properly with the right gauge wire, and being shielded.
– martineau
Jul 21 '15 at 9:29
length also plays a big role, longer cables will lose signals
– nwgat
Jul 21 '15 at 10:00
length also plays a big role, longer cables will lose signals
– nwgat
Jul 21 '15 at 10:00
add a comment |
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TVs don't commonly have VGA, and I've generally had to set it manually. What sort of Mac? Macs haven't had VGA out in years so what sort of adaptors are you using?
– Journeyman Geek♦
Jul 21 '15 at 2:51
@JourneymanGeek It's a 3-year-old Samsung TV, relatively low-end. It has an HDMI port which I use for my RPi and a VGA port that I use for my 2013 MacBook Air. I have an Apple adapter to convert I believe display port to VGA.
– Leo Jweda
Jul 21 '15 at 2:53
I half suspect the adaptor may come into play. I'd also add, as of 2015, no major computer manufacturer is supporting VGA and DVI, so chances are those cables will stop being made in a few years. You can still find some systems with support, but in general dp's the preferred standard for Monitors, and HDMI for TVs. PCs will output both, of course.
– Journeyman Geek♦
Jul 21 '15 at 3:14
@JourneymanGeek Like I said, in the exact same setup, with the exact same adapters, some cables work and other don't. It most definitely NOT the adapter. Cute dog BTW.
– Leo Jweda
Jul 21 '15 at 3:17