LG 60UH605V no picture no sound no backlights

[notallbad]

psu : EAX66923301 (V1.3)
main : EAX66882503 (V1.0)
tcon : 6870C-0628A (V0.2)
panel : LC600EGE

2016 model

TV red standby light comes on when plugged in, press remote on button or tv power on button and standby light flashes 3 times, exactly the same with tcon disconnected from main or either left or right panel ribbon cables disconnected.
There are no diagnostic leds on psu or main that I can see.
No faint or dim picture visible, no backlights, no sound.

psu stby voltages (with main connected or disconnected) are
ms 0v
gnd 0v
13.2v 8v bouncing
13.2v 8v bouncing
gnd 0v
pwr-on 0v

p-dim1 1.88v
gnd 0v
13.2v 8v bouncing
13.2v 8v bouncing
13.2v 8v bouncing
p-dim2 1.88v

psu on voltages are
ms 0v
gnd 0v
13.2v 13.1v
13.2v 13.1v
gnd 0v
pwr-on 3.38v

p-dim1 0.27v
gnd 0v
13.2v 13.1v
13.2v 13.1v
13.2v 13.1v
p-dim2 0.27v

both led output circuits show 190v stby
both led output circuits show 320v on

tcon fuse has 13v on both sides.

Led tester shows 179v powering both led strips which are strips of 66leds.

Is this looking more like a panel issue? or are there other checks before condemning.

[notallbad]

So looking like its more likely the psu or main, what I have noticed is that the spdif out (optic) port does not light up and usually on main boards they light up with a red led, there seems to be power at the usb port as it powers a hdmi streaming stick.
So from this I would suspect the main board to be most likely at fault but not knowing what voltages should be on the psu, other than the obvious 13.2v, like the ms pin, what is the ms pin as it reads 0v in stby or when switched on.

To replace the psu or main would be too expensive to chance as both are equally highly priced for an old model tv.

[notallbad]

So, it would seem I'm missing the MS pin 2.1v signal from the Main board. All other pin voltages seem ok.

[notallbad]

Found an LG main and power board from a different tv in my spares shed which has the same pinouts on the psu to main.
So I can get the backlights on at least with the spare main board so looks like psu and backlights ok but as it has a different tcon (doesnt actually have a tcon, connects directly to panel) I cant test the screen so looks like I need to get a replacement main and hope the screen is ok. Had a look at the main and cant find anything obvious other than the main soc chip has very hard thermal paste so my guess is its cooked, if its not then quite sure the issue is firmware so either way beyond repair I guess.

[notallbad]

So having sourced a main bd, well actually its from a 60UH625V-ZA.BEKWLJP, but says compatible with 60UH605V-ZC.BEKWLJP, dont suppose anyones able to confirm this is correct?

TV now powering on however picture has the odd few horizontal blacks lines, some go then come back, others just permanently stay and also screen shadowing - almost certainly looks like a panel issue or could it be the main needs settings changed to be a 60UH605V so it has correct configuration for the tcon/panel.

Any advice on testing to determine if it is a panel issue? Inspected top and underside of panel tabs and no obvious signs of burnt/shorted panel or tab ribbons.

[notallbad]

Yes, can confirm its working and compatible.

Issue sorted and working fine.

[tom66]

How did you resolve the issue, for others who may have this problem in the future?