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Search: Posts Made By: Capt. Cap
Forum: Troubleshooting Computer Displays 10-19-2018, 05:03 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

I was looking at the power supply board with a magnifying glass, forgot it was still plugged in running in standby mode, and accidentally touched the metal frame of the magnifying glass across some...
Forum: Troubleshooting Computer Displays 10-17-2018, 02:06 AM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

I checked BUF07704 (https://www.badcaps.net/forum/attachment.php?attachmentid=182491&d=1536701504) and got similar results to what rrflorida mentions...
Forum: Troubleshooting Computer Displays 10-17-2018, 12:54 AM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Turns out it's not the ribbon cable :(

I got the idea to swap the two cables, and the right side of the display still works with the cable I thought might be bad, and the left side of the screen...
Forum: Troubleshooting Computer Displays 10-16-2018, 01:35 AM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Thanks for taking a look!
That's relieving to hear! Earlier today, I did Tom's T-CON board diagnosis spreadsheet mentioned here (https://www.badcaps.net/forum/showthread.php?t=45378), and it had...
Forum: Troubleshooting Computer Displays 10-13-2018, 07:24 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Heh, I thought that might be the case, but your comment also made some sense since you pointed out the logic board is made for a 12V display and the panel is 5V.
Forum: Troubleshooting Computer Displays 10-13-2018, 07:21 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Regarding this ribbon cable on CN501, it is very finnicky - if I don't leave it with a little pressure holding it just right, the right side of the display goes from normal to faded and discolored.
...
Forum: Troubleshooting Computer Displays 10-13-2018, 07:03 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Some more good news!

I removed FB14 and soldered in some copper wire across it, and got a consistent image on the right side of the display.

By gently pressing around on the ribbon cable at...
Forum: Troubleshooting Computer Displays 10-13-2018, 05:06 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

All of these parts are original with my HG281D. The logic board / TCON / display combo is what was slapped together at the factory.
Some fine HannsSpree engineering for you there :rolleyes:
Forum: Troubleshooting Computer Displays 10-12-2018, 05:23 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

I was poking around the circuit boards again today, and when I checked the front of the screen, on the right half of the display, a sort of faded, discolored image was showing!

:group:

I took...
Forum: Troubleshooting Computer Displays 10-11-2018, 12:11 AM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

TCON measurements follow


VCC 3.32V
VDDR 3.30
VDDA 4.59V
VGL 0.46V
VGH 0.59V
VGH_M 0.18V
F400 4.85V
Forum: Troubleshooting Computer Displays 10-10-2018, 11:21 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Yes, 4.85V at F400



Bingo!



:facepalm:
Forum: Troubleshooting Computer Displays 10-10-2018, 07:57 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Yep, it's 1.5 Ohms and I just double checked all of the power pins, no continuity with anything else and Q14 source. BTW, this meter reads about 0.8V at continuity so 1.5 isn't that far off.
Forum: Troubleshooting Computer Displays 10-10-2018, 05:49 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

I figured out why I was having such a hard time following the +12V to the Q14 source pins:
Q14 source is connected to pin 4 of the power supply header, which is 5.05V and goes through FB14...
Forum: Troubleshooting Computer Displays 10-10-2018, 03:42 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Sorry, I should have stated that clearer, by no resistance I meant 0Ω, not open-circuit. Or in this case, 0.8Ω with my HFT special ;)

I bothered mentioning because, just like you said, they...
Forum: Troubleshooting Computer Displays 10-10-2018, 02:54 AM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Logic board PM549DA3 M06 VER6.0 images attached

Q14 is a 9435GM P-channel enhancement-mode power MOSFET (http://www.farnell.com/datasheets/1704686.pdf)
Q15 is a 2N70002K N-channel enhancement...
Forum: Troubleshooting Computer Displays 10-09-2018, 07:09 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

No worries, I hope you didn't lose anything :eek: Sounds like my typical week.



I'll check resistances on Q14 tonight, see my reply to budm for voltages.
I have v6.0 of the board, it's mostly...
Forum: Troubleshooting Computer Displays 10-09-2018, 02:14 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Yes, connected, sending signal over HDMI, made sure it's not asleep, and the CCFL is powered on.

The CCFL does power on / off with connecting and disconnecting HDMI, and when the computer goes to...
Forum: Troubleshooting Computer Displays 10-09-2018, 02:15 AM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

I started checking resistances and voltages on the TCON, the voltages were all way off (VGL, VGH, and VGH_M are all 0V) and eventually got back to F400 which has 0.84V on both sides.

Not sure what...
Forum: Troubleshooting Computer Displays 10-08-2018, 04:36 AM
Replies: 37
Views: 5,572
Posted By Capt. Cap
Re: HANNS G HZ281 White Screen

Doesn't look like any reliable retailers have it available in small order quantities https://octopart.com/search?q=buf07704&start=0

but you can get a single BUF07704 chip here...
Forum: Troubleshooting Computer Displays 10-07-2018, 07:48 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Also, I checked F400, was getting some resistance there (~35 ohms) but I get that just touching the tips of the probes together.
I need to dig up my good multimeter, but in the meantime I think F400...
Forum: Troubleshooting Computer Displays 10-07-2018, 07:40 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Pictures of the TCON are attached.
Let me know if there are any others I can take that would be of help.
Thanks!
Forum: Troubleshooting Computer Displays 10-07-2018, 02:28 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

I went ahead with replacing all of the caps on the logic board.
Unfortunately, I'm still seeing the same issue (all white screen).

I was pretty hopeful this would work as the 100μF caps near the...
Forum: Troubleshooting Computer Displays 10-07-2018, 02:18 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Regarding the noise measurements, I checked ground from one side of the logic board to ground on the other side of the logic board and got 14mV of noise - I figured anything much greater than that...
Forum: Troubleshooting Computer Displays 09-18-2018, 02:03 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

I opened up the monitor and broke out my multimeter and oscilloscope as I wanted to get an idea of the difference any modifications make.

Apologies for the _s, I couldn't get it to align correctly...
Forum: Troubleshooting Computer Displays 09-13-2018, 05:24 PM
Replies: 47
Views: 1,161
Posted By Capt. Cap
Re: Another HannsG HG281D

Maybe not so intermittent after all... I haven't been able to get the screen to display an image at all today, even on first attempt :crying:
Showing results 1 to 25 of 36

 
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