Hisense 50P6

[viewerau]

Re: Hisense 50P6

Diah....thanks for your reply

The tcon board has been screwed to the back of the tv during every test

Yes, I did misread and erred in not having the jumper in place without the power being off first.

My apology.

How can we be sure that the panel is toasted, as from my observations throughout all the processes, it still appears to be behaving no different than it always has?

Had the power been off to the tv as detailed, what were we expecting to see or otherwise determine what was going to be the next step? Were we looking for some specific reaction?

I try my best, and appreciate it that people are giving me their expertise free of charge and so forth, and for that I am greatful and humbled

Surely I can try the test again to see what eventuates, but knowing what reaction I should be looking for may help as I try my very best as an absolute beginner.

Thanks

EDIT
I just fired up the panel again after being out this afternoon

It still has exactly the same start up stipes, and with ldvs disconnected from tcon board, it still has backlights, as well as the picture showing black, with dull illumination.

[Diah]

Re: Hisense 50P6

unfortunately you failed by beginner mistake how ever we told you the T-CON should be screwed to chassis & put the jumper in place of T-CON fuse then turn on... what you did just you turn it on and with shaking hand you touch the jumper to t-con. each spark you saw will raise currents toasting T-CON and over load COFs. so you have now absolute dead Panel with toasted one COF or more..
BTW: if you are lucky.. you could have parts on the buffer boards fault.

[viewerau]

Re: Hisense 50P6

Video did not attach...try again...nope..says invalid file (mp4)....I'll try another way

https://1drv.ms/v/s!AmaToYrR3wFwgqhj...yvumA?e=YPYDj9

https://i.imgur.com/VGK8QBu.mp4

[viewerau]

Re: Hisense 50P6

Thanks for the above information...helps me try to understand.

Back to problem solving.

I removed all the donor parts and reinstalled all the original parts.

I am hoping these photo's may help the diagnosis?

The first 3 photo's show the screen with all the lines at startup(tagged startup)...in this stage backlights are still on

Next with the tcon disconnected at LVDS (tagged blankscreen)...dull glow to screen, backlights on

Next set (tagged jumper) etc...same as above, lvds disconnected, backlights are on, and the jumper held between 12v rail on power supply, and other end to P as requested. As said previously, a little spark emits when touching the probe to either the left or right of P. Response was picture jumping into these blue colours.....nothing at any time could be detected with a torch.

Last one is the video by my wife as I have jumper in place.

Cheers

[Diah]

Re: Hisense 50P6

now days there are just 2 type of panels used on TVs. VA & IPS. and both type related on the way they aligned the crystal cells on the thin film layer.

the master roll to drive this crystal cells are COFs, and the COFs drived and controlled by panel buffer boards.. the fault at any parts of ceramic Caps on buffer boards will show result as you showed us at last state.. color line move up and down or left to right.. because the signal and currents disrupted. these fault will make COFs as blind cant control the vertical and horizontal job of the crystal cells.

at your case first thing we were thinking and it may too fault at buffer boards if the panel... but when you did the test and it showed full screen bright white color give us other theory that the signal from MB disrupted.

[viewerau]

Re: Hisense 50P6

Out of curiosity whilst conducting these tests, my head needs to know what it is, that causes these led panels to fail?

Are there common ongoing problems a panel can have, that are nothing to do with the usual external boards and ribbons that we can change and swap around?

What is the cause of panel failures, and how is it determined that it is a panel that is faulty ?

I have spent many hours googling about panel failure, but have so far, not been able to find site or link that discusses the reasons in any layman's terms.

Most just talk about bonding cof issues, and any repairs on these is beyond us without one of those bonding machines they show us.

I know that I am only a 1% novice, but it beats me as to why the panels have this sort of unrepairable or difficult to fix mechanism after all these years

I'd appreciate it if anyone can enlighten me on my questions, while in the morning I will try to return the Hisense back to it's old parts and continue to provide the feedback asked for.

Thanks

[viewerau]

Re: Hisense 50P6

Thanks again.

I will give all that a go tomorrow morning.

Cheers

[Diah]

Re: Hisense 50P6

This test conducted with donor boards all in use.
The screen remained black, no lines, nothing....torch revealed nothing.
All that was noted was a small spark as the wire connected giving power to the t-con
Damage doing this

the test when you did it with original T-CON and PSU you reported full bright white screen with out any lines . now its different. ( put back yours original T-CON & PSU and do the test again)we need to know there are no damage happened to the panel .
the donor boards i do think now they related to other model or diffrent size which had different panel parameter. just in case compaire all lable of them

Damage doing this

as i expected at my post#96 ... any damage to LVDS PINs or ribbon cable. or to the sockets which became not tight enough will cause huge damage beside the effect of line or color pattern on screen.

[viewerau]

Re: Hisense 50P6

This test conducted with donor boards all in use.

I asked if the BL turn on after you unplug the LVDS between main boards and T-CON... if yes then do the test I mentioned...

Yes..the backlights turn on with the LVDS disconnected from T-con board

if yes then do the test i mentioned...
feed the F1 on T-CON 12V from power boards while the LVDS always disconnected from T-CON side... tell us what do u have on screen

I ran a wire between 12v and the P

The screen remained black, no lines, nothing....torch revealed nothing.
All that was noted was a small spark as the wire connected giving power to the t-con


Damage doing this
The LVDS cable that secures to the T-con board, the little tabs you squeeze to remove the cable fell off, dunno how I get the cable out now....derrrrr.

I have attached a new set of pictures....

The start up now goes into these green lines that pulsate, fade away, and then return bright again.

A video of it

Some pictures of the green lines, back of panel, and showing backlights burning strongly.

[viewerau]

Re: Hisense 50P6

Thanks Diah...I will have to do that tomorrow morning Australian time, as the set is out in my garage, and I need to do that in the daytime.

Thanks again for putting up with me

[Diah]

Re: Hisense 50P6

lets go back to first square start with my post #6 test.. do it again same way. amd tell if the result same as you posted before in yours post #20

[viewerau]

Re: Hisense 50P6

Diah....I do not know what is going wrong, I am trying my best.

I tried to follow on with what you said at post #91, by doing the mainboard swap over.

If where I have done something wrong, I apologise, but I am still trying after many long days and nights of googling over many weeks to try to find someone with the same issues.

It gets so frustrating when some people say (not here, elsewhere in my searches) it is the p/s, the mainboard, the t-con, the panel, or whatever.

I can accept it if the panel is dead, but how do you determine it is dead, or what is the problem in the panel that makes it dead?

It would be nice to know, what is the fault and how they cause this sort of things.

Other places also tell me to try the tape method, however, on removing ribbons, I don't seem to get the tell tale signs of one side good and one bad either, so I then don't know what side to try some tape, and at what place on the ribbon cable, as my t-con doesn't seem to have the tell tale symbols of ck1-ck8 or JP1-8, like I should be able to find?

Sorry, but all I am doing is trying.

[Diah]

Re: Hisense 50P6

What now please?

this is absolute different from yours Test you wrote to us at yours post #20

whats going wrong with yours work... you could damaged LVDS or ribbon cable pins.!!!!

[viewerau]

Re: Hisense 50P6

Well, the parts arrived from my donor tv

PS
Mainboard
T-Con

Disappointment prevails.

The steps I took.
1)
Removed the old mainboard
Refitted donor mainboard
RESULT
As before, backlights on, the usual vertical lines present across the screen

2)
Left donor mainboard in place
Removed old t-con board
Refitted donor t-con board
RESULT
Backlights on, no picture at all on screen, no lines

3)
I then tried via removing ribbons from the t-con, to see the results

a)Removed the ribbon from the t-con board only, that feeds the left of the screen, looking from the front
RESULT
As above, Backlights on, no picture at all on screen, no lines

b) I then reconnected that ribbon to the t-con board, and removed the ribbon that supplies the edge boards on the left side screen.
RESULT
As above, Backlights on, no picture at all on screen, no lines

4)
c)Reconnected things back up for the left side of screen, and removed the ribbon that connects to the t-con and supplies feed out from t-con to the right side of screen
RESULT
This put the lines up again, but the lines were on the left side, and backlights on

d) reconnected the ribbon that fixes to the t-con board, and removed the ribbon that leads to the right side edge boards
RESULT
Same as other..This put the lines up again, but the lines were on the left side, and backlights on

5)
I left the donor mainboard and donor t-con all connected as they should be.
I removed the older power supply, and installed the donor power supply board, and connected them all up
RESULT
As it always was...lines everywhere, just the same as when the old boards were all in place.

What now please?

[viewerau]

Re: Hisense 50P6

Sorry... I don't understand that

[b0ba]

Re: Hisense 50P6

the Hisense logo would appear briefly and then

a working panel to scrap?

the first post seems like a VGH/VON (brand dependent dubbing) issue. You can't just swap T-CON boards when ribbons match.

[viewerau]

Re: Hisense 50P6

Thank you again Diah

[Diah]

Re: Hisense 50P6

my post #21

start with replace MB.
yours AU readers TV seem have BL issue. so his MB will be fine

[viewerau]

Re: Hisense 50P6

I am hoping for a little more guidance please.

I have been very fortunate, in that another reader in Australia, contacted me about this matter.

He advised his parents had one of these, but the TV stopped working a couple of months ago. It would turn on, the Hisense logo would appear briefly and then the screen would go black.

He offered to remove the p/s mainboard and t-con, and to post them to me, to see if one of the parts could get my one going....what a great offer!!

I thought I would post here again, without going like a bull at a gate, and seek advice before I start.

Would anyone care to suggest in which order I should try the interchange of boards, so that I can minimise any possibility of damage along the way?

At present, all the tv will answer to from it's original remote (since purchased) is power on/off, no other buttons doing anything. More in a moment

To recap, this is all the tv shows, and swapping of cables from t-con achieves nothing.

Today, in playing around again, I noted that whilst the tv was in standby (red light on), that if I pressed the remotes NETFLIX button, all the lines changed to mainly red, the same colour you see when you fire up netflix,.the same button also shuts it down....weird I know, but a slightly different reaction than previously seen.

All assistance appreciated...just awaiting the boards arriving.....thanks

[viewerau]

Re: Hisense 50P6

Got a replacement remote, the right one for the telly EN2B27.

Not having much luck getting the tv to recognise that either.

The power button will not start it ala one press...have to hold the power button on the remote for about 15 seconds to kick it, but again it will not help, in that all we get are lines as per usual, no boot from usb stick

Same for turning it off, have to hold in power button again.

Weird in that the Logitech Harmony remote will turn it both on and off with one simple press of it's remote button though.

I dunno what to do anymore?????