Radeon 6850 1GB-OC and SyncMaster T220 No Display Issue?

[Antrophin3]

Few days ago i borrowed my friend an old Gigabyte 6850 1GB DDR5 OC (Windforce), only to have him say he gets no display on his SyncMaster T220 monitor... He tried to connect it via VGA -> DVI-I Adapter. I soon figured out that his monitor is DVI-D (not really sure if it is Single or Dual Link Monitor), so that converter won't work (it's meant only for converting analog signal through the DVI-I).

His rig is:
Gigabyte ga-z68mx-ud2h-b3,
i3-3240,
8GB of RAM,
500W FSP Group PSU...
(All 3 Pciex slots tested and working with HD 4870 from Palit, which only has DVI-I inputs, and works just fine with the T220 - DVI-D, as the 6850 should have worked as well). Both outputs on the GPU are DualLink

So i also borrowed him my DVI-D (Single link cable), same thing as with the converter, no display on either ports: DVI-I or DVI-D, since that DVI-D SL fits both of those, and should work. The DVI cable is working (tested on the Gigabyte r7 250x which has two DVI-D ports, in each, working perfectly).

I have tested the card with DVI-I ViewSonic monitor and it is working.

I've also upgraded the BIOS of the 6850 from F10 to F21 via ATIwinFlash tool, just to make at least that (somehow) out of the question.

Also tried connecting to my SAMSUNG TV via hdmi, that also doesn't work. Digital display part of GPU gone bad? How does DVI-I monitor even work connected to GPU's DVI-I via Single link DVI-D cable?

a) How can i get the GPU to work with the before-mentioned monitor?

b) It would be only logical to try to find a DVI-D (dual link cable)?

c) What other options do I have... ?

EDIT: I also noticed today, after reapplying thermal paste to the GPU, the part just right from the GPU's connectors is hotter than the GPU chip itself... hmmm

 

[eidairaman1]

Check and ensure the right video input is selected on the monitor osd/bezel switch.

Also im unsure what you are saying. Did you let your friend borrow the 6850? Did you flash the card before putting it in his machine?

By the way is the power supply plugged into the video card?

There is typically no reason to flash a gpu bios unless instructed to do so by the card manufacturer. Being a 6850 it is way out of warranty so if the card is bricked just save up money and buy another.

By the way has the motherboard bios been cleared and set to factory defaults?

Also the Monitor has to support Dual Link DVI in order for the gpu to utilize Dual Link, otherwise it utilizes single link, dual link were for very high resolutions at the time.

Here is a troubleshooting guide for the monitor

http://support-us.samsung.com/cyber...050758&model_name=T220&model_cd=LS22TWHSU4/ZA

Has the motherboard bios been updated?

 

[Antrophin3]

Thanks for your response.

Yeah, I have borrowed him my 6850, so he can get a bit more FPS in Fortnite (over 4870).

I flashed it just recently, after the attempts in his PC, trying to make the GPU show display on my DVI-D monitors, or his for that matter.

The 6pin PSU connector (1 molex to 6pin) was connected (it worked just fine with my DVI-I viewsonic 19" LCD - connected to the GPU's DVI-I port, having display and working normally in the HP DC7700 old PC).

For the BIOS flashing, I've read on forums that F21 has better settings for the GPU fans (that is the version of the card that still had below-average quality, nosiy, crackling 2nd fan).
I've used the exact BIOS from the techpowerup archive of BIOSes, you quoted. 6850 1GD5-OC 820Mhz core clock.

Motherboard's BIOS is the latest and it has been reset to factory defaults prior to plugging the GPU into slot(s).

 

[eidairaman1]

Thanks for your response.

Yeah, I have borrowed him my 6850, so he can get a bit more FPS in Fortnite (over 4870).

I flashed it just recently, after the attempts in his PC, trying to make the GPU show display on my DVI-D monitors, or his for that matter.

The 6pin PSU connector (1 molex to 6pin) was connected (it worked just fine with my DVI-I viewsonic 19" LCD - connected to the GPU's DVI-I port, having display and working normally in the HP DC7700 old PC).

For the BIOS flashing, I've read on forums that F21 has better settings for the GPU fans (that is the version of the card that still had below-average quality, nosiy, crackling 2nd fan).
I've used the exact BIOS from the techpowerup archive of BIOSes, you quoted. 6850 1GD5-OC 820Mhz core clock.

Motherboard's BIOS is the latest and it has been reset to factory defaults prior to plugging the GPU into slot(s).

If possible id go back to the old bios, now i heard in some instances with 3rd Gen core i cpus you will need to try it in another pcie slot.

If slots are dirty or contact pins are they might need to be cleaned, card seating can be a problem- breadboarding may help.

 

[agent_x007]

Samsung T220 should have more than one input (my T240 has VGA, DVI-D and HDMI 1.x).
Did you checked back of the monitor for more input options ?

 

[Antrophin3]

Samsung T220 should have more than one input (my T240 has VGA, DVI-D and HDMI 1.x).
Did you checked back of the monitor for more input options ?

No, only 2 display ports are available:
https://www.cnet.com/products/samsung-syncmaster-t220/specs/

If possible id go back to the old bios, now i heard in some instances with 3rd Gen core i cpus you will need to try it in another pcie slot.

If slots are dirty or contact pins are they might need to be cleaned, card seating can be a problem- breadboarding may help.

I have tried in all 3 PCI-E slots, same thing...

 

[agent_x007]

I guess you checked both VGA and DVI then ?
(choosing imput as needed in menu)

 

[Antrophin3]

I guess you checked both VGA and DVI then ?
(choosing imput as needed in menu)

Yes I did, it doesn't work either.

So here are some screenshots, everything seems perfectly fine with that monitor...

 

[eidairaman1]

So when you put it back in yours it fails? Have you tried breadboarding your own to ensure it is not a seating problem? By the way take a picture of the entire edge connector front and back of ca4d and post it here

 

[Antrophin3]

So when you put it back in yours it fails? Have you tried breadboarding your own to ensure it is not a seating problem? By the way take a picture of the entire edge connector front and back of ca4d and post it here

Thanks for reply.

Yeah, it only works with that DC7700 setup, tried breadboarding, it also doesn't work, so far i tried on 4 DVI-D monitors, same story. Ok I will do that and post photos...

About the temps, the card seems quite cool even if the temps outside are 30C+ last couple of days...

So when you put it back in yours it fails? Have you tried breadboarding your own to ensure it is not a seating problem? By the way take a picture of the entire edge connector front and back of ca4d and post it here

Ok, is this what you meant? Should I have removed the fan and heatsink to take photos of the entire PCB? That is the molex to 6pin that I used, and works perfectly with that DVI cable and the photo of the "magical" monitor

I'm really intrigued as to what is going on with the GPU's digital connections (HDMI, DVI-D)... Haven't yet got the hold of the DVI-D -> DP adapter (not sure if the GPU's DP port is DP++ or not) - as that's the only thing I haven't managed to test.

 

[kambei.7s]

I have Sapphire Radeon 6870 and Benq VW2220 using DVI connector, and from time to time monitor does not wake up from idle power state with that video card, and all fine on another monitor, strange bug...
But check your video card for any damages, keep attention on ceramic little smd's near PCIe slot to display ports.

 

[Antrophin3]

I have Sapphire Radeon 6870 and Benq VW2220 using DVI connector, and from time to time monitor does not wake up from idle power state with that video card, and all fine on another monitor, strange bug...
But check your video card for any damages, keep attention on ceramic little smd's near PCIe slot to display ports.

Thank's for the reply.
What should i be looking for at the backside of GPU ports? What kind of damage?

 

[Aquinus]

That sounds like DDC isn't working. No digital connectors can operate without DDC but, VGA has some fallback defaults that it will use when DDC isn't working. This basically would prevent the GPU from reading the EDID of the display. The card is probably on the way out.

 

[Antrophin3]

That sounds like DDC isn't working. No digital connectors can operate without DDC but, VGA has some fallback defaults that it will use when DDC isn't working. This basically would prevent the GPU from reading the EDID of the display. The card is probably on the way out.

Ok, i think i understand what you mean.
So, that might be the reason why only DVI-I monitor works hooked up onto DVI-I GPU port (with DVI-D SL cable).

 

[kambei.7s]

Thank's for the reply.
What should i be looking for at the backside of GPU ports? What kind of damage?

Damaged SMD's, little ceramic capacitors. I suppose you must check from PCIex video card port to DVI port, It can be a reason. In my experience damaged SMD on Radeon 5770 from the box (one contact damaged) I soldered it and 'monitor bug' similiar what you have - went away.

 

[eidairaman1]

 

[kambei.7s]

Black one seems stabilisators, gray - capacitors. Check black one too.