LG 75UH8500 color static frozen

[EazyBone]

Got a LG with color static frozen. Doesn't move just stays on this picture. I'd assume it's main board but I'm sure one of you has seen this before. Any data helps thanks

[Diah]

it could be issue on MB the rail of >20V .. if it response to RC. try send IN_STOP command via service RC

[EazyBone]

Do I have to do a specific sequence of commands or just hit instop button on service remote? Just want to make sure there isn't a hidden unknown button press sequence. But I will try

[Diah]

IN_STOP followed with key 0-4-1-3

[EazyBone]

Negative, can't turn it on nor perform instop while on or off with commands.

[Davi.p]

Already seen this in previous models, i remember one model that did this only in network videos.. for me the same old damn error, bga error on main board, if lg panel possible bga on tcon but i suppose them are the same (all in one mb+tcon)

[EazyBone]

As in the EMMC or the CPU. If CPU is this something a reflow would handle?

[Diah]

Negative, can't turn it on nor perform instop while on or off with commands.

you need to reduce load on the set... for example disconnect speaker... Wifi/BT module... the side control keys disconnect it... in case you have one keys always pressed--- .. use HDMI signal via ARC HDMIL port to ölet the set sync and switched to HDMI Input...

[Davi.p]

Reflow is non sense method, especially in fixed apparatus, bga balls are to be replaced because tin alloy is not good..

[EazyBone]

Yes that's not quite what I'm asking but still doesn't answer which component.

[Davi.p]

ok, a reflow could reveal or not, could even worsen the situation, also freezing could reveal maybe, i don:t experiment much, heat and cool have different effects..

[Storyteller12]

It's definitely the main board. Test the caps in ohm mode around the big BGA chips. Which ever chip has the low ohms caps near is the problem.

you can try a reflow for testing but my experience with this model lg is you have to replace it. I've never got a reflow to work

you can buy the chips but they come from China so takes a while to get and need BGA workstation.

Mainboards are getting expensive and almost impossible to find for this model though and will just have the same fate

[EazyBone]

Okay sure, figured it was and yes it looks impossible to get one apparently.. which is why I am here. I'll keep looking

[Davi.p]

..