HDMI problem
I use two monitors. I have one monitor with HDMI and another monitor
that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? |
HDMI problem
"Seymore4Head" wrote in message ... I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? If you plug the main monitor into the HDMI port and leave the secondary unplugged, does the primary monitor work? If it does, then I would think that the graphics card is OK. If the primary remains blank, well, you see where I'm going here :-( -- SC Tom |
HDMI problem
Seymore4Head wrote:
I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? The HDMI cable has a +5V wire on it. If the +5V wire touches the I/O pairs, it could damage either a transmitter pad driver or a receiver pad. You did the test with a new HDMI cable, the monitor didn't work. That means something on the video card end is blown. In a situation like this, you should do as much testing with the "damaged" goods, to not endanger "new" goods quite yet. Use the working outputs on some video source, and the ports on the monitor, to assure yourself that the monitors haven't been damaged in any way. You at least want to verify the monitors, before jumping to any conclusions. This means trying permutations and combinations using the existing goods, to work out whether the video card has a defective output, or the monitors have something blown. Individual tests, one test case at a time, should suffice. (I.e. an electrical failure should not be causing desktop monitor order issues). Just make sure each port works individually, as part of your damage assessment. You can test the monitor ports, one at a time, using the chipset/motherboard connectors. ******* Onboard (so-called "chipset graphics), can have usage limitations. The HDMI and DVI-D could actually be sharing the same wire lanes, and the manufacturer "intended" the user to only use one at a time. On a chipset DVI-I, sometimes a manufacturer splits one of those and makes a DVI-D connector and a VGA connector. The driver may not support using both at once, depending on how it views usage of the crossbar on the GPU output. These details are not documented anywhere. The hardware maker is "ashamed" to admit to such things. It is left to people in forums to document "I can't run DVI and VGA at the same time on this motherboard". Newer gear doesn't have these limits. You can run three monitors off the back of the motherboard. You're going to need to datamine, using CPU/chipset/motherboard details, to get some usage rules. ******* Now, pop another video card in there, and move on. Nobody really likes chipset graphics all that much, and especially if driving multiple monitors. One disadvantage of modern video cards, is they've lost the VGA connector. You might find DVI, HDMI, DisplayPort, but we appear to have passed the VGA era. In an emergency, you can convert DisplayPort to VGA with an adapter, so that remains as an option, but increases the price of the "repair". A low end card now, can be two slots wide, even though they could have made it a bit thinner. You have both a connector issue (not the right mix for your existing monitors), as well as the thickness of the card perhaps interfering with other stuff in the PC. Good luck, Paul |
HDMI problem
On Wed, 28 Mar 2018 09:42:58 -0400, "SC Tom" wrote:
"Seymore4Head" wrote in message .. . I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? If you plug the main monitor into the HDMI port and leave the secondary unplugged, does the primary monitor work? If it does, then I would think that the graphics card is OK. If the primary remains blank, well, you see where I'm going here :-( The HDMI didn't work when I plugged it either port. I think my next step will be to take the monitor and plug it into another machine. I suspect it may be the monitor. |
HDMI problem
On Wed, 28 Mar 2018 07:54:05 -0400, Seymore4Head
wrote: I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? I wanted to test to see if the HDMI monitor was working. I have a Firestick so I plugged that into the HDMI port and the monitor worked. Someone suggested the onboard HDMI and the DVI can't work at the same time. So I unplugged the DVI and plugged in the HDMI. The HDMI does not work. The spare cable I have is a 25ft HDMI cable that was working the last time I used it. How can the monitor work with the Firestick and not work with the 25ft HDMI cable? I don't think either monitor was plugged into the mobo and both were plugged into the Graphics card. It seems very remote that the mobo port was effected by the chewing HDMI plug. I still have not put my Graphics card back in the computer. What should I try next? |
HDMI problem
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HDMI problem
Seymore4Head wrote:
On Wed, 28 Mar 2018 07:54:05 -0400, Seymore4Head wrote: I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? I wanted to test to see if the HDMI monitor was working. I have a Firestick so I plugged that into the HDMI port and the monitor worked. Someone suggested the onboard HDMI and the DVI can't work at the same time. So I unplugged the DVI and plugged in the HDMI. The HDMI does not work. The spare cable I have is a 25ft HDMI cable that was working the last time I used it. How can the monitor work with the Firestick and not work with the 25ft HDMI cable? I don't think either monitor was plugged into the mobo and both were plugged into the Graphics card. It seems very remote that the mobo port was effected by the chewing HDMI plug. I still have not put my Graphics card back in the computer. What should I try next? Perhaps pick up a replacement HDMI which is the same length as the one the dog chewed ? It's possible the onboard chipset graphics aren't detecting the HDMI termination resistors. Or, maybe a setting needs to be made somewhere to change ports (it's decided not to auto-switch on its own). On a laptop, you'd have an F-key which you could use, to switch the graphics output from port to port on the GPU. I doubt the binding for such is set up on a desktop. Maybe you could use the chipset VGA to one monitor, then try to bring up the chipset graphics Display panel and enable the HDMI from there ? Grasping at straws here... Paul |
HDMI problem
Seymore4Head wrote:
On Wed, 28 Mar 2018 09:42:58 -0400, "SC Tom" wrote: "Seymore4Head" wrote in message ... I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? If you plug the main monitor into the HDMI port and leave the secondary unplugged, does the primary monitor work? If it does, then I would think that the graphics card is OK. If the primary remains blank, well, you see where I'm going here :-( The HDMI didn't work when I plugged it either port. I think my next step will be to take the monitor and plug it into another machine. I suspect it may be the monitor. Does the other machine have an HDMI cable on it you can use for testing ? Other than the 25 foot one. Paul |
HDMI problem
Seymore4Head wrote on 3/28/2018 5:54 AM:
I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? We have a cat who enjoys chewing on all cables and cords. Our solution is something called "split loom cable wrap." It is a wrapper for cords of all sorts. You cut an appropriate length of wrap then put the cable, wire or what not in it - the wrap can be pulled open length wise so it's relatively easy to apply. We have used around a thousand feet of the stuff (plus or minus a few hundred) and we use more every time a new electric device is brought into the house. We have wrapped cords from appliances, extension cords, all cords and cables to and from our computers and entertainment boxes (TV etc.). This cat is a destructive idiot and shows no signs of maturing - youngest of five by several years. We like him so we will continue ordering split loom. Fortunately we discovered the problem and solution before he did too much damage. The most expensive loss was the recharging mechanism for my electric toothbrush: $80 since the part was no longer supplied by the manufactured. Pet your puppy for me! -- Jeff Barnett |
HDMI problem
On Wed, 28 Mar 2018 11:14:26 -0400, Seymore4Head
wrote: On Wed, 28 Mar 2018 09:42:58 -0400, "SC Tom" wrote: "Seymore4Head" wrote in message . .. I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? If you plug the main monitor into the HDMI port and leave the secondary unplugged, does the primary monitor work? If it does, then I would think that the graphics card is OK. If the primary remains blank, well, you see where I'm going here :-( The HDMI didn't work when I plugged it either port. I think my next step will be to take the monitor and plug it into another machine. I suspect it may be the monitor. Have you tried plugging it into the mains? And *checking* it is plugged in? And have you tried flicking the "on/off" switch/button on the monitor? Have you checked the brightness? Yes, those are stupid questions but you'd be surprised by how many "my computer is totally broken" calls to the help desk end with a quiet "oh!" when they are asked. J. |
HDMI problem
On Wed, 28 Mar 2018 07:54:05 -0400, Seymore4Head
wrote: I use two monitors. I have one monitor with HDMI and another monitor that uses DVI. The HDMI is primary. I was using the computer and both monitors went blank. I found the problem. My dog chewed the plastic off the HDMI end next to the computer. I replaced the HDMI cable and neither monitor came on. I pulled out the Graphics card. I can plug the DVI into the mobo and it works. When I try to plug in the HDMI the second monitor switches from primary to secondary, but the HDMI monitor won't come on. I can unplug the HDMI and the other monitor becomes primary again. How do I get both monitors working again and then how do I tell if my Graphics card is bad? The problem turned out to be the 25 ft HDMI cable. I have used the cable before to connect my laptop to my 50 inch TV, but I quit using it when I bought the WDTV player. I tried using the HDMI cable with the WDTV player to just test it, and I could see the opening screen but it would the picture would flash in and out. I bought a 10 ft cable and all is well. I sure am glad my video card did not get fried. Thanks everyone |
HDMI problem
Wolf K wrote:
On 2018-04-07 11:42, Seymore4Head wrote: [...] The problem turned out to be the 25 ft HDMI cable. I have used the cable before to connect my laptop to my 50 inch TV, but I quit using it when I bought the WDTV player. I tried using the HDMI cable with the WDTV player to just test it, and I could see the opening screen but it would the picture would flash in and out. I bought a 10 ft cable and all is well. I sure am glad my video card did not get fried. Thanks everyone Good to know. Thanks for reporting back. Sounds like at 25ft the impedance was just too much for the video card to handle. The parameter you want, is likely to be "loss" or "dielectric loss". The AC impedance is actually constant, whether the cable is one foot long or twenty five feet long. HDMI cable is 100 ohms differential on R,G,B,CLK. A resistor on each of those signal pairs in the monitor, terminates the cable in its characteristic impedance of 100 ohms. In fact, the video card detects it should output a signal on the cable, by noticing a 100 ohm load on each pair. The launch amplitude might be on the order of 1V, just making up a value. The "loss" in the cable, might cause the amplitude at 25 feet, to be only 25mV. And that's sort of the sensitivity limit at the receiver. The signal is too weak then, to be cleanly thresholded and turned into ones and zeros. Either the picture has colored snow (if slightly degraded), or eventually the synchronization information is lost, and the monitor switches to a black screen. Now, the really funny part, is HDMI cables come in different material compositions. They might have to meet some minimum level of performance. But in some cases, the dielectric loss of one cable might be significantly better than another cable. If you bought ten 25 foot cables and compared, maybe one or two of them actually worked at that distance. And we're not talking Monster cables here either. Spritzing 10u of gold plating on the connectors on either end, doesn't convert a cable into a "hero". But a change of "plastic" dielectric in the cable, could make a difference (polystyrene or teflon). Some of the dimensions of things inside the cable might have to change, if the dielectric is modified, so such a change is not without some visible side effects. Cutting samples of good and bad cables, and looking at a cross-section, might reveal differences. By comparison, as far as I know, all SATA cables are made the same way. But things like HDMI, who knows what they stuffed in there. All that the cable has to do, is present the signals with enough amplitude and good enough group delay that the digital signal can be recovered. If the cable is made "even better", there's no difference in the picture or sound. Once all bits are received error free, getting 100mV of amplitude instead of 50mV, doesn't "make the picture brighter or the sound sparkle". This is digital transmission, not analog, so the degradation tends to be "make or break", rather than "fuzzy or soft". https://www.cnet.com/news/why-all-hd...-are-the-same/ Some actual tests. https://web.archive.org/web/20110525...ull-test/4373/ ******* The VGA era was different, in that as the cable length went up, we would adjust the resolution down to compensate. At zero feet, maybe the setup supported 1600x1200, while at 100 feet, a setting of 1024x768 is usable, and 1600 would be out of the question (too fuzzy). The degradation was a kind of "continuous variable" with VGA. Not the abrupt "make or break" of HDMI. It's possible for some effects like that with HDMI, but the user isn't always at liberty to switch down to 640x480 in order to make a long cable work. Maybe an output device, only outputs HD 1920x1080 (say, a DVD player). ******* There may be various proposals to make "smart cables", and have the destination end send a signal back to the driving end, to adjust the line build-out. But thinking along these lines works best, if the idea is standardized so all equipment supports the idea. https://patents.google.com/patent/US9042437 For a price, you can probably send an HDMI signal with a fiber optic cable. And then the reach might be kilometers. But the simple wire cable is cheaper. You can also send HDMI wirelessly, at 60GHz. As long as the transmitter and receiver are in the same room, in line of sight, and preferably less than 25 feet apart. The fiber optic transmitter might be cheaper :-) Paul |
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