Toshiba (Vestel) 50UL2063DB - bad COF?

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

I haven't been pressing the screen connection ribbons.
Advice? Any voltages to check? Oscilloscope waveforms?

LCD LED TV repairs based on boards replacements include screen.. no wave data documentation even at service partner for any brands. before with CRT was wave data because repair based on parts.

this will be my last post in case you still hesitated to take out the bezel and inspects screen.. because any other option will be like swimming in the middle ocean no sign of land.

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

Dear Diah,

I sense frustration from you, as I am reluctant to potentially destroy the screen just to look at the ribbons.


Please understand, I am not a professional like you, I do this on an occasional basis, not daily like you, so I want to try everything else I can, before I risk the screen, especially as I cannot see any option to repair the screen if I do take out, and find an issue.

If I do take the screen apart, what will I learn ?

Either:

ribbon connection IS damaged = no repair

ribbon connection is NOT damaged = no repair

the screen gets cracked during extraction or replacement = no repair

From my observations, which I have tried to describe to you, I find that I can ALWAYS get the left side to have a picture if I disconnect the right side (the left side does deteriorate after 5 minutes, with colours becoming "inverted")
If I disconnect the left side, the right side shows "noise" - no picture, no boot up logo.

Obviously, this can be a tcon issue (I have replaced with no improvement), LVDS has been changed with no change. PSU from the 50" JVC has been swapped, no improvement.

This leaves the MB or the screen.

Could the signal from the MB to the Tcon give a bad image consistently to just the right side of the screen?

I understand if you have exhausted your patience with me, and I just want to say thank you for your persistence and patience in trying to help me out, because, like me, helping others is what brought you to the forum and it is what keeps you coming back.
Without members like you, it is just a bunch of people asking difficult questions and getting no answers.

Best regards

Russell

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

Dear Russell,

i didn't push you to do some things dangerous to damage screen. i didn't asked you to take the screen apart.. because no need at all... bezel are just square cover round the screen. taking it out will never touch or damage screen. this work didn't need any be professional. some bezel are put in place as clips. easy from down side ( tv chassis ) clip them out and push the bezel out... and in case the bezel at the downside where the led indicator and IR sensor had screws. need to open them and then clips it out.. all this work you did with 50 jvc.

why need this bezel to take it out. i explained it to you before... MB the main IC could work with one Chanel and send data to T-CON to turn off. if there issue on screen.. but you used 40 size on it for test... and you did update... yours profile SW & HW look fine even many function turned on.. you did update and reset it.. and last things yours screen some time work with out any issue as you wrote before.. so if previous owner used liquid cleaning on the screen and it drops down on buffer boards or at flex cable of cofs contact with screen... this need to inspect.. then we can find solution if there are damage found.


did you try yours toshiba MB on the JVC screen ??

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

Dear Russell,

i didn't push you to do some things dangerous to damage screen. i didn't asked you to take the screen apart.. because no need at all... bezel are just square cover round the screen. taking it out will never touch or damage screen. this work didn't need any be professional. some bezel are put in place as clips. easy from down side ( tv chassis ) clip them out and push the bezel out... and in case the bezel at the downside where the led indicator and IR sensor had screws. need to open them and then clips it out.. all this work you did with 50 jvc.

why need this bezel to take it out. i explained it to you before... MB the main IC could work with one Chanel and send data to T-CON to turn off. if there issue on screen.. but you used 40 size on it for test... and you did update... yours profile SW & HW look fine even many function turned on.. you did update and reset it.. and last things yours screen some time work with out any issue as you wrote before.. so if previous owner used liquid cleaning on the screen and it drops down on buffer boards or at flex cable of cofs contact with screen... this need to inspect.. then we can find solution if there are damage found.


did you try yours toshiba MB on the JVC screen ??

As the JVC MB and t-con dont work in the Toshiba is there any chance the Toshiba MB and tcon will work in the JVC?
the trouble is, the screen of the JVC is more cracked now so it is difficult to see anything on it.

I will have a go with this tomorrow, to see if Toshiba works in JVC.

I have successfully taken a number screens out of TVs in the past, (mainly Vestel ones) which had two part plastic bezels, which clips to the metal chassis (as you will already know), which are quite easy remove.
The JVC and Toshiba have a different design, where the metal chassis is visible at the top, and only the boards are covered with a plastic cover on the lower part of rear, (instead of being covered by a full size plastic rear cover as in older TV's I have worked on) meaning that the frobt bezel that holds the screen in to the chassis, clips into the metal chassis directly and is incredibly tightly fitted around the metal chassis.
This is how the JVC got more cracked as it took a lot of force on the plastic bezel to get the clips to disengage from the metal chassis.

When I fitted the JVC 40" MB130S, I did not get a full screen displayed.
If I disconnected the right ribbon, I got a stretched image on the left (which was actually the image that should have been on the right), if I disconnected the left, the right shows corrupted data, the same as the other MB, so it was not a success.

Thanks again as I really do appreciate your continued time in supporting me, and I am learning a lot.

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

i mean on the 40 size

mean while you can backup all important file of yours toshiba MB .. by same way you did with profile
DownloadDevprofile.mb230 DownloadPQ.mb230 DownloadProfile.mb230 DownloadSound.mb230 DownloadSpi.mb230 DownloadSQ.mb230

i found on yours HW profile some things strange at pannel config i cant explain..
it say panel are LG32 and 3D comparable
maybe yokono or other can find file mb230_hwprofile.bin for compare or full firmware for MB230

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

Dear Russell,

i didn't push you to do some things dangerous to damage screen. i didn't asked you to take the screen apart.. because no need at all... bezel are just square cover round the screen. taking it out will never touch or damage screen. this work didn't need any be professional. some bezel are put in place as clips. easy from down side ( tv chassis ) clip them out and push the bezel out... and in case the bezel at the downside where the led indicator and IR sensor had screws. need to open them and then clips it out.. all this work you did with 50 jvc.

why need this bezel to take it out. i explained it to you before... MB the main IC could work with one Chanel and send data to T-CON to turn off. if there issue on screen.. but you used 40 size on it for test... and you did update... yours profile SW & HW look fine even many function turned on.. you did update and reset it.. and last things yours screen some time work with out any issue as you wrote before.. so if previous owner used liquid cleaning on the screen and it drops down on buffer boards or at flex cable of cofs contact with screen... this need to inspect.. then we can find solution if there are damage found.


did you try yours toshiba MB on the JVC screen ??

Duplicate post removed

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

i mean on the 40 size

mean while you can backup all important file of yours toshiba MB .. by same way you did with profile
DownloadDevprofile.mb230 DownloadPQ.mb230 DownloadProfile.mb230 DownloadSound.mb230 DownloadSpi.mb230 DownloadSQ.mb230

i found on yours HW profile some things strange at pannel config i cant explain..
it say panel are LG32 and 3D comparable
maybe yokono or other can find file mb230_hwprofile.bin for compare or full firmware for MB230

The 40" JVC MB130S was removed from a TV with a broken screen two years ago, and screen was recycled, so screen is not available to me anymore.

Even though panel config is unusual, this does not prevent correct operation on some occasions.

If I backup all the files you suggest, how do i view them, like you have shown?

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

then dont do it... let solve this question about panel ID... are yours toshiba 3D UHD TV?

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

Here is a thought, I have a Panasonic TX-48CX400B: see this thread https://www.badcaps.net/forum/showthread.php?p=1079548.
This TV didn't get fixed and still has an issue with the display. I dont know what screen type it has, but may be worth a try with MB/Tcon? - I need to find out what MB is fitted first. I know TV is UHD and 3D compatible. I am very doubtful it would work, due to age difference.

I know that the screen in the Panasonic has side COFs.

As another test, I have a 43" Toshiba - https://www.badcaps.net/forum/showth...t=90482&page=2
I actually did find and fix this fault myself!!!

What chance that this MB and Tcon could be used for a test in the Toshiba 50UL2063DB?

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

then dont do it... let solve this question about panel ID... are yours toshiba 3D UHD TV?

50UL2063DB specs:

https://toshiba-tv.com/uk-uk/ultra-hd-tv/50UL2063DB

3D - I dont think so (it was given to me, but haven't seen a menu for 3D)

UHD - Yes, for sure.

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

not a good option.. focus on finding full recovery firmware .. masking with this condition make no sense to me.. but if you like try it..
by the way yours toshiba panel are LG IPS

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

also i can understand yours fair of the screen by taking out the bezel... but why you don't just remove the speaker and have access to the panel buffer boards at least we see it its label boards condition if there U ribbon between any half of puffer boards or not.. etc

[yokoono]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

i mean on the 40 size

mean while you can backup all important file of yours toshiba MB .. by same way you did with profile
DownloadDevprofile.mb230 DownloadPQ.mb230 DownloadProfile.mb230 DownloadSound.mb230 DownloadSpi.mb230 DownloadSQ.mb230

i found on yours HW profile some things strange at pannel config i cant explain..
it say panel are LG32 and 3D comparable
maybe yokono or other can find file mb230_hwprofile.bin for compare or full firmware for MB230

Profiles for comparison.
Full software for MB230
https://files.fm/u/4kbh8dhm8

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

Profiles for comparison.
Full software for MB230

thank you yokoono.. hope Russell download it and flash it on his 230 to check if its lack with firmware..

copy the contect (2files ) after extract on USB fat32 insert it in tv while it off. then press OK on your RC keep pressing while you plug it in wall give time to it

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

Thank you yokoono for the firmware, I will give it a go.

@Diah:I did release the lower edge of the bezel, to expose the right side COF connections to the distribution board.

There were some deposits (see picture) on the COF towards the centre of the screen, which is the first COF. for the right side distribution board, which I have removed with 70% IPA. All others are clean.
There was no improvement.

Something I have noticed (when I am
lucky enough to get a full screen) is that the dc-dc converter inductors on the tcon get really hot to touch after only a few minutes (only when a full screen is displayed) and the inductors are making a buzz sound. The picture disturbance follows the frequency of the buzzing sound also.

If I disconnect either left or right ribbon, the tcon operation is silent and inductors are only a bit warm, but I only get have picture shown (as expected).

If both ribbons are connected and I apply power to TV, after a few seconds I can hear a slight buzz of the tcon dc-dc converter, then the buzz stops and I get no picture as the tcon dc-dc system has been shut down.

I have had access to the buffer (distribution) boards all the time, as the lower half of the rear cover must be removed to access the tcon. The buffers boards only connect to the tcon, not to each other.
I have attached pictures that show the right side (problem side) buffer board
(all six COF are shown).

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

its look as i thought before... so the cleaning liquid rest you found and cleaned was on this first cof flex cable close to the ribbon socket at this picture

in case yes please upload very focused clear photo on the area at the buffer boards to see parts
at this time dont do any for firmware.

ESIT: about the load and buzzer you have on T-CON could be your IPA still not dry 100% or it went down the flex cable need to dry it with hair dryer... or because you did many time ribbon plug in and out one or more pins get moved to side or broken the tips of them need to inspect them carefully... from both side.

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

IPA evaporated before reassembly, and only small amount was used

COF6 on buffer board, picture attached.

I did a naughty thing - I fitted the right side ribbon, but did not close the retaining latch.
I powered up, and had left side only (as expected - good quality image) and while still powered with an image showing , I closed the retaining latch for the right side - naughty I know!!. This gave a good full screen picture for about 5 minutes! So the TV is capable of providing a good picture, for short periods.
Then it started having intermittent lines (see car picture - as a still image it is OK, but as a moving images, there is distortion that the camera does not show). the tv remained on, showing a picture with lines for 2 hours. I turned it off, restarted 30 minutes later - no picture and tcon power has tripped again.

What can I learn from this? Could still be bad tcon when hot or a bad screen or bad MB, so really, no further forward!!

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

actually its belong the flex cable of this cof. didn't touch the screen glass complete and it could be there rest of that deposits went down between the screen glass and the flex cable. it could be repaired by rubber pressure apply on the area under the bezel if user don't have silicon flat pits iron used for this flex cable.

alternative you can try mask one of these group at the ribbon prefer from t-con socket.

[Russ17]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

actually its belong the flex cable of this cof. didn't touch the screen glass complete and it could be there rest of that deposits went down between the screen glass and the flex cable. it could be repaired by rubber pressure apply on the area under the bezel if user don't have silicon flat pits iron used for this flex cable.

alternative you can try mask one of these group at the ribbon prefer from t-con socket.

To confirm, I should mask just ONE of the FOUR lines you have marked, and isolate them on the T-Con socket ribbon cable, using insulating tape, and not cut the tracks on the t-con or the buffer board.

What do each of the four tracks do?

[Diah]

Re: Toshiba (Vestel) 50UL2063DB - bad COF?

To confirm, I should mask just ONE of the FOUR lines you have marked, and isolate them on the T-Con socket ribbon cable, using insulating tape, and not cut the tracks on the t-con or the buffer board.

What do each of the four tracks do?

correct, but how to explain you this four tracks what to do if there are no schematic !!! i did make remark before on post #75