LG 65UH5500-UA Backlight flash on first power up only

[budm]

Re: LG 65UH5500-UA Backlight flash on first power up only

https://www.badcaps.net/forum/attach...1&d=1576726423
1.2V = Enable PFC only
2.2V = Enable PFC + HBC
BTW, If that pin is connected to anything then it should not change state.

[jason123]

Re: LG 65UH5500-UA Backlight flash on first power up only

So after several attempts at finding what else that pin 22 is connected to, I took the IC off the board again (hopefully no major damage!) and sure enough, that pin 22 (unless I'm counting incorrectly) is "ONLY" tied to that cap (Used for soft start mode only) - I don't see a way it's connected to an opto / enable function.

What am I missing?

[budm]

Re: LG 65UH5500-UA Backlight flash on first power up only

OK, I read page 11 and 12, the IC has internal pull-up circuit for pin 22 to start the IC, you then pull it down when you want to disable the IC.
So basically, this board the PFC/HBC are always running.

[jason123]

Re: LG 65UH5500-UA Backlight flash on first power up only

So given that there maybe issues with the main board, I wanted to replace it (since I am vested in this TV - ), but the same part number board (EAX66958003(1.1)) seems to be used also on 50UH5500

Does anyone know if the 50UH5500 board would work in this 65" TV?
I couldn't find firmware to flash the main board if needed, or do I need to change something in the service menu?

[nomoresonys]

Re: LG 65UH5500-UA Backlight flash on first power up only

If that is your board, then your board number is EBR82959601, the other numbers are generic numbers, board gets populated, board gets sticker, the number is on the sticker, minus EBR : https://www.shopjimmy.com/lg-ebr8295...-ua-cusjlh.htm

[nomoresonys]

Re: LG 65UH5500-UA Backlight flash on first power up only

Now looking at the reference guide here, it does appear that they use the same firmware but I did not see anywhere while looking at boards from various sites where they will interchange: https://www.lg.com/us/support/product/lg-65UH5500.AUSQ

[jason123]

Re: LG 65UH5500-UA Backlight flash on first power up only

Thanks... just got the board and it seems to work beautifully.. when i look in Settings it says TV is UH5500...seems all firmware is the same as you stated for the UH5500... Oddly people on ebay are selling the 65UH5500 for higher price than the 50UH5500

[Diah]

Re: LG 65UH5500-UA Backlight flash on first power up only

with service remote or apk on android if you use (E-Z adjust) and (IN_Start) you can change the version of size / serial no / and other stuff to match the original info which printed on the back cover of the set... in order to connect correct to LG server update and smart server

[nomoresonys]

Re: LG 65UH5500-UA Backlight flash on first power up only

Glad to hear it worked.

[jason123]

Re: LG 65UH5500-UA Backlight flash on first power up only

Thanks Diah. Nothing seems to need an update. Software is connecting to server and downloads correctly. Thanks

[jason123]

Re: LG 65UH5500-UA Backlight flash on first power up only

Glad to hear it worked.

I am in disbelief... very glad it worked. Thanks