Hi,
Can you please send your email addy to me again.....SORRY.
I have finally found time to work on that Hisense TV, and removing that number D004 has allowed the Hisense to boot up and play.
It is displaying another problem, and if possible, I'd like to show you a video or some stills from it to try track this part down as well?
My apology
My email is [email]jmurton27@gmail.com[/email]Hi,<br />
Can you please send your ..., and removing
ruckusman
Member
Last Activity: 09-23-2023, 02:25 AM
Joined: 01-03-2009
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Re: Hisense 50P6
They're tiny aren't they...
Leave the edge boards all connected up, including all t-con ribbons.
Don't worry about the diode function, just test each pin for short to ground.
They are 5 connections going top to bottom on them - the centre pins are going to ground - top and bottom - use those pins to check the continuity to ground on the meter.
So if you can put one lead to the metal chassis of the screen [ground] and test the two outer pin pairs, one at a time across both the top and across the bottom.
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Re: Hisense 50P6
That's your 'edge' boards in that shot [I assume that shot is inverted] - they are connected to the t-con by the ribbon cables you've been having issues with and they run along the edge of the screen.
Find the protection diodes on those edge boards and check them for short circuit to ground....Leave a comment:
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Re: Hisense 50P6
17 flashes is normal, mine does that when working properly.
Your symptoms are similar [identical] to mine.
I scoured my t-con for errors [incorrect voltages - one was a negative voltage source, which was correct and near zero, two others with effectively zero voltage which was protection mode - the incorrect voltages on the t-con was a symptom of the blown diodes, NOT the actual cause of display issues], you can measure the voltages at each inductor but I suspect you're dealing with blown diodes also.
Check my thread again...Leave a comment:
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Re: Hisense 50P6
Leave the ribbons connected to the t-con, then you can use the TV back panel metal as ground.
It makes it much easier as the diodes are so small, you don't want to be managing two multimeter leads whilst trying to touch each pin on the diodes and only one pin at a time if possible.
Meter set to diode test if you have one, that may give you a red led indication.
Otherwise the lowest resistance value and if it's short circuit to ground you will get zero ohms resistance.
Have you gone...Leave a comment:
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Re: Hisense 50P6
I predict that if you check them, you will likely have a short as I did.
Those components prevented my unit from displaying a correct image, I had precisely the same symptoms as you, the lines up the screen.
You'll need a magnifiying glass to see the solder point to test them.
The centre pin is ground on both sides - all of the others pins 1, 2, 4, 5, 6, 7, 9 and 10 should not go to ground in a short circuit.
The diodes are tiny SMD components, for the time and effort that you've put in it's worth getting a hot air pencil,...Leave a comment:
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Re: Hisense 50P6
I've just succeeded in repairing mine.
It may assist you with yours once you get the replacement ribbon cable.
You can also trim yours shorter, BUT not as short as in the video you found.
Jut a few millimetres of the end where the tracks have lifted may get it back to a working state.
My solution was the removal of BOTH of the ESD diodes from the outer buffer boards.
BOTH ESD diodes had a short circuit and both had to be removed for the TV to correctly display an image.Leave a comment:
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Re: Hisense 65P8
Thanks for this tip, it saved me removing the t-con board again unnecessarily and spending time checking components when no problem existed.
[B][I]SUCCESS[/I][/B]
I have a working TV again.
[ATTACH]300515[/ATTACH]
The solution was the removal of D001 from BOTH outer buffer boards, please keep that in mind to understand the tests I conducted which follow.
Firstly checking the 4263H ESD diode on the outer buffer board revealed a short circuit on the pin labelled in the photo.
[ATTACH]300517[/ATTACH]...Leave a comment:
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Re: Anyone with experience repairing a bad MAIN board?
It's an incredibly helpful community, nothing worse than running out of ideas on what to check next.
A mighty fine effort by all concerned and I love your perseverance - inspirational, that's how these faults get solved and the knowledge base grows.Leave a comment:
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Re: Anyone with experience repairing a bad MAIN board?
This is a great thread seeing it come to a successful conclusion with such a small part only needing to be replaced.
Good work!Leave a comment:
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Re: Hisense 65P8
I haven't desoldered the ESD diodes yet as I don't want to just remove something before a thorough check and test.
Now I can see what you mean by the U ribbon, your description was clear, my vision and thinking was not, it was very late last night.
The U ribbon is this connection between the buffer boards.
[ATTACH]300307[/ATTACH]
I will test with the two U ribbons disconnected, the t-con LVDS cables connected and the t-con to buffer cables connected obviously.
Now I fully understand that test....Leave a comment:
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Re: Hisense 65P8
Thanks lotas, I have been reading some of your other solutions to similar issues, especially this one with the TVS protection diodes
[url]https://www.badcaps.net/forum/showthread.php?t=118195[/url]
I will check across the components of the buffer boards and remove the TVS diodes tomorrowRe: Hisense 65P8<br /> <br /> <br ...t=118195[/url]...Leave a comment:
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Re: Hisense 65P8
I've just run two further tests on the t-con:
One in both standalone mode and with the LVDS cables connected with the t-con to buffer ribbons cables connected alternately; and
One with the above with both t-con to buffer ribbon cables disconnected.
I was checking voltages at the inductors.
First test previously was with all cables connected and I got some strange voltage readings on some of the inductors, noted on the image.
[ATTACH]300244[/ATTACH]
Then the same check of the...Last edited by ruckusman; 05-18-2023, 07:00 AM.Leave a comment:
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Re: Hisense 65P8
Yes I have conducted that test as well as the standalone t-con test.
The screen remains darkened at all times, it does not display an image/pictureLeave a comment:
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Re: Hisense 65P8
Here are the 4 buffer board photos, visual inspection doesn't show any blown components.
I have circled the 4263H TVS diodes on both of the outer boards.
[ATTACH]300226[/ATTACH]
[ATTACH]300227[/ATTACH]
[ATTACH]300228[/ATTACH]
[ATTACH]300229[/ATTACH]
I will go through and check for any shorted capacitors or open circuit resistorsRe: Hisense 65P8
Here are the 4 buffer board photos, visual inspection doesn't show any blown components.
I have circled the 4263H TVS...Leave a comment:
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Re: Hisense 50P6
Thank you, now I understand firstly, that there is possibly a t-con standalone mode and what it might display; and
For that standalone mode on his unit, both ribbons from the t-con to the panel must be connected; and
All of this depends upon the particular t-con model....Leave a comment:
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Re: Hisense 65P8
OK, now I understand what you mean by U cables.
I have removed the cover from one buffer board, I will take some photos and upload them once I have removed the second cover for access and photos.
Stay tuned...Leave a comment:
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Re: Hisense 65P8
Yes I have ribbon cables connected to the buffer boards.
The panel is in perfect condition, it got put in place and has never been moved since it was first installed.
It has never been wet or had anyting spilt on it.
It's my TV so I know all of it's history.
Tests I have done:
First test:
Main board with both LVDS cables connected to t-con and one side of t-con U ribbon to buffer boards, each side separately.
Dark screen, no image both times on either side of the panel - no change.
Second...Leave a comment:
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Re: Hisense 50P6
I think he meant that the t-con in standalone mode won't display anything [it doesn't have a standalone mode], it will only display something when connected to the main board also.
I recall he said something like that previously, related to firmware on the t-con.
Diah feel free to correct me if I am wrong.Leave a comment:
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Re: Hisense 65P8
Thanks, I have checked all of the ribbons, both ends between the main board and the t-con and the t-con to buffer boards.
All are in perfect condition with no signs of burning or discolouration from excess current.
First:
I have done the test with removing 1/2 half of the t-con to buffer board ribbons, one side and then the next.
No change the screen stays dark on both sides with that test.
Second:
I have also done the test with the t-con LVDS cables disconnected from the main board and provided...Leave a comment:
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