Toshiba 58UL2B63DB Suspected Bad Panel

[Ukdigger]

I'm guessing that the panel is faulty, but I've never seen one do this before. Can anyone confirm this before I sell it for spare parts.

[nomoresonys]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

very likely, can you give the bezel NOT the screen a squeeze, see if the display changes any.

[Diah]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

i tipp on Firmware issue panel MFC ... re flash an update or downgrade.

yours MB are 17MB230 , search this forum i linked firmware for full v0.38.30

[dskall]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

I would be checking for proper voltages at t-con first.

[nomoresonys]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

my first thought was bad tab bond contact, possibly "fixed" with shims.

[Ukdigger]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

My pictures show what happens in sequence when turning on from cold. In the final one the picture freezes and the screen goes about 90% black, the sound carries on working normally, this all happens within a minute or so.
Squeezing the bezel at any point makes no difference.
TCON BOARD is CCPD-TC575-009 V1.0 STCON676G
VCC = 3.2v
VCOM L = 6.9v
VCOM R = 4v
AVDD = 0v
VGHIN = 0v
VGL = 1v

[Ukdigger]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

With the left ribbon disconnected the right half of the screen works perfectly
With the right ribbon disconnected the left half of the screen has the problem

[nomoresonys]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

try the tape cut-off method.

[nomoresonys]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

AVDD = 0v: should be 13-20
VGHIN = 0v if this is vgh then probably 20-30
VGL = 1v: should be -5 to -12

[Ukdigger]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

With the left ribbon disconnected

AVDD = 15.3v
VGHIN = 23.9v
VGL = 5.9v

[Ukdigger]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

With the right ribbon disconnected
AVDD = 15.2v
VGHIN = 23.6v
VGL = 5.9v

Has a whited out picture but doesn't fade to black

[Ukdigger]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

Both ribbons connected and voltages have come back. full picture with no fade to black but random faint vertical striping.
Shouldn't VCOM left and right be the same?

[nomoresonys]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

seems like it, I would test all the little caps on the tcon, with panel driver board cables unplugged, if you don't find any short plug cables back in and test again, also test the caps on the panel driver board, with tcon to panel cables unplugged, test diode/continuity mode, one probe on ground, chassis ground is ok, other probe on each side of cap, one side should beep or read close to 000, other side should not beep or have a reading. Can also test for very low ohms.

[Ukdigger]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

I can't find any shorted caps on the T-con board when plugged or unplugged form panel driver board. The caps on the right side panel driver board all test good when unplugged from the T-con board. The caps on the left side panel driver board can't be tested as there is no ground when unplugged from the T-con board but test ok when plugged into the T-con board.

[nomoresonys]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

vertical stripes or partial vertical stripes can be tcon issue. maybe cleaning the ribbon cables going to panel might help, some use pencil eraser some use q-tip and isopropyl alcohol, not to vigorous they can be delicate, be sure and let it dry a while. Check the side going to the mainboard too.

[Ukdigger]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

I tried the tape method using a paper strip just wide enough to cover 8 contacts. The TV works now with no problems. I watched these two videos to help.
Thanks for everyone who helped.

https://www.youtube.com/watch?v=pfrRhw7-ZII
https://www.youtube.com/watch?v=IQbnbqF_g2s

[nomoresonys]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

ala post #8, glad to hear it.

[Grandalf]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

Looks like I have a similar problem. How did you figure out which are the clock lines, they are not marked. Have tried second one in and the next 7 from both ends of the connector. No difference at all. Only spare boards available in the uk are from china. Any advice really appreciated

[Grandalf]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

Additional to last post. My Tcon is CCPD-TC575-009-V1.0. This is very difficult to find. Anyone know if any other boards will fit. There seems to be a few different ones all shown as suitable for this model, but not sure if any of these versions will work, mine is 2009 I think

[dskall]

Re: Toshiba 58UL2B63DB Suspected Bad Panel

What voltages are you missing?