Hisense H55U7B vertical stripes

[halen]

Hi all,

I have Hisense H55U7B TV with no picture, only big vertical stripes. I did several tests and I'm not sure, where is problem.

1. Connected tcon to 12V, white, red, green, blue, black picture visible in cycle on full LCD without error
2. Connected only left side of LCD to tcon, big stripes
3. Connected only right side of tcon, visible normal picture on the right. Working as expected.

Where could be problem?

Tcon RSAG7.820.7932/ROH
Main board RSAG7.820.8698/ROH

Jan

[lotas]

A common problem with these TVS diode assemblies (they have breakdown or leakage of zener diodes).

[Diah]

i would like to see yours mainboards with out heat sink of the SoC and the panel buffer boards side as yours test No 2

[halen]

In this configuration of tcon was possible to view picture and use menu of TV. I will upload soc tomorrow. And one correction to previous test. When is connected tcon in this way and connect 12V, then RGB colours are switching normally and fast . White, red, green, blue, black. When I use second half of tcon then RGB is switching too, but slowly and lazy color change with some blurring colors together, but finally end on correct color.

[Diah]

In this configuration of tcon was possible to view picture and use menu of TV. I will upload soc tomorrow. And one correction to previous test. When is connected tcon in this way and connect 12V, then RGB colours are switching normally and fast . White, red, green, blue, black. When I use second half of tcon then RGB is switching too, but slowly and lazy color change with some blurring colors together, but finally end on correct color.

this why i am interested on the Panel buffer boards side at yours post 2, you have there issue... but to know how SoC feeds LVDS we will know the / T-CON Panel function to analysis yours previous test

[nomoresonys]

Well bad caps thanks for fuking up the layout of the site YET AGAIN, it really wasn't necessary. So make it hard to navigate by keeping on changing shit up, I just will be skipping this site.

[Diah]

Well bad caps thanks for fuking up the layout of the site YET AGAIN, it really wasn't necessary. So make it hard to navigate by keeping on changing shit up, I just will be skipping this site.

this new layout and distances over posts are just money earning over advertising , but who thought to destroy to earn money are stupid. we are now at open source webs , we are now at 2025 not 1995 the time of Netscape browsers LOL

[CapLeaker]

this new layout and distances over posts are just money earning over advertising , but who thought to destroy to earn money are stupid. we are now at open source webs , we are now at 2025 not 1995 the time of Netscape browsers LOL

Hahaha! 95 Netscape browser... LMAO

[halen]

There are photos of main board soc, MSD6886NQHAT-8-00GH.

[Diah]

One SoC with GPU, so yours issue 100% at the Panel self, remove the metal cover of the bad side and inspect the buffer boards

[halen]

I did it. Measure if there is something shorted, like capacitor or transistors, but all seeems ok.

[lotas]

A common problem with these TVS diode assemblies (they have breakdown or leakage of zener diodes).

[halen]

Part Is littelfuse SP1064E-04UTG (marking 4264H) And I did measurement And looks in good shape. No Ohm shortage to ground. Carefully checked rest of components on driver and nothing found. IT could be defective tcon or it is not possible?

[Diah]

you need to put only the bad side at RGB test as you did before , and monitor the Temperature of the ESD diode or zener one.... they read fine. but they are not realy good, so Temprtaure will be rise

[halen]

Yes, I tested it already and temperature is normal, like other components. May I try to replace tcon or it is 100% sure, that tcon is ok? Because half of display switching colors normally, bad half slowly and I cannot find anything bad at all.

[nomoresonys]

this new layout and distances over posts are just money earning over advertising , but who thought to destroy to earn money are stupid. we are now at open source webs , we are now at 2025 not 1995 the time of Netscape browsers LOL

I think they're trying to save money while trying to monetize by letting...I think first graders or chimps from the zoo, redesign the layout.

[Diah]

Yes, I tested it already and temperature is normal, like other components. May I try to replace tcon or it is 100% sure, that tcon is ok? Because half of display switching colors normally, bad half slowly and I cannot find anything bad at all.

try to mask tape only the pins 1 & 2 far left of the bad side, between temperature rise up by time not immediately

[halen]

What exactly you mean with it? Isolate first two pins of flex cable? From tcon to driver?

[Diah]

What exactly you mean with it? Isolate first two pins of flex cable? From tcon to driver?

1-2

[Davi.p]

Hi, are you able to retouch or replace well solder tin on tcon big main chip? bye

[halen]

Yes, I'm able to resolder main bag chip of tcon module. I did isolation of two pins and result is same.