LG49UH603v No image backlight on

[bohaboha]

On this set new LED strip. Backlight on but no image
have discovered very hot ic in red market in the picture plus some capacitor that are shorted on mainboard ,3v,5v,and 12v is in present want help deciding which is the bad boy

[bohaboha]

Is this bad image or I this ribbon extremely dirty. Almost looks burnt

Bravo EasyBone and Diah very good eyes you guys have. that Ribbon is restored because I accidentally bumped it off

[Diah]

yours photo LVDS NO 2 damaged .. or didn't fit in the socket correct.. do it again correctly

[bohaboha]

have checked them are well put in place

[Diah]

have checked them are well put in place

upload new photo of the LVDS NO 2. let see

[bohaboha]

On main board ic7703 and capactor next to it are really hot plus the 4 smd capacitor under coil 220n2 is short
You were right about the LVDS one just in the picture

[Diah]

sorry man.. yours eyes very bad or you are under stress alcohol this why do don't notice the fault its very clear at Socket NO 2 LVDS.

[bohaboha]

sorry man.. yours eyes very bad or you are under stress alcohol this why do don't notice the fault its very clear at Socket NO 2 LVDS.

yes it was not anymore se the last image not for the main board the pic was from thee first post but lvds you ask about

[EazyBone]

Is this bad image or I this ribbon extremely dirty. Almost looks burnt

[bohaboha]

Is this bad image or I this ribbon extremely dirty. Almost looks burnt

Bravo EasyBone and Diah very good eyes you guys have. that Ribbon is restored because I accidentally bumped it off

[bohaboha]

a little update now I have re-removed THE ribbon which was badly soldered . but I see that IC7703 is burnt see the pictures. what to do now. tried to find on the internet but can't find anything with the designations that are on IC7703 is there anyone who can help

[lotas]

TPS65175B
https://aliexpress.com/item/1005002713379080.html

[bohaboha]

TPS65175B
https://aliexpress.com/item/1005002713379080.html

thanks so much lotas.have there must be some other components around that are ruined

[EazyBone]

Buy new.main board. That should do it.

And dayummm that's a nice hole in the chip

[bohaboha]

Buy new.main board. That should do it.

And dayummm that's a nice hole in the chip

There is no way to fix the main board? The hole I think it's my fault I used part of a candel to see how hot it is and I cleaned it badly afterwards

[Donny2derby]

TPS65175B
https://aliexpress.com/item/1005002713379080.html

Lotas can you explain a few things on here for me?? I don't expect you to know or tell me everything but just to help me with my own knowledge.

For example. What is pin 12 Swb? What is SWB? And what purpose are the two resistors in parallel with 2 caps in series doing? Why is OPT on there? Is this an optocoupler?

[Diah]

this IC are programmable one. SWB software Bias, OPT are Optional in case in circuit non linear Diode in place. not as Zener diode... most all OPT on diagram you couldn't find them on the reality circuit as said Optional

[Donny2derby]

Ahh brilliant Diah thanks. I did wonder what OPT could be and did consider I was making a mistake with optocoupler as this was not usual symbol for one.

[lotas]

12 pins SWB - 1.8V output voltage for panel buffer boards. Resistors and capacitors in this circuit serve as a filter for this power supply.

[Diah]

at the end this IC my first time i saw it exploded , and its cant replaced with RAW one.

[Donny2derby]

12 pins SWB - 1.8V output voltage for panel buffer boards. Resistors and capacitors in this circuit serve as a filter for this power supply.

Thanks very much Lotas. I'm beginning to understand a lot more about IC's and things like Vcc thanks to you and Diah.

Hopefully the next few projects I have lined up will give me chance to learn more and test more about this sort of thing without having to ask the very basics.