LG LED TV diagnostic help please

[MattM]

Hi,

I have an LG 65UF950V LED TV on the bench. The fault symptoms are that the set will power up to the LG screen and immediately then the display goes black. We have two or three blinks on the front power LED as it is doing this although it is not clear how many it would normally emit.

With much pressing of buttons on the remote it has intermittently started up - I would say about 1 in 20 attempts although there is no consitency. When it has started up it has functioned normally. There have been other occassions when the cursor from the smart remote comes on the screen which can be moved around but nothing else.

Software has been updated and reset.

The boards look fine to me but I can source mainboard, PSU, T-Con etc but am a bit hesitant about where to start. My gut instincts were to replace the mainboard.

Any thoughts/advice would be very much appreciated.

Thank you

Matt

[sordids999]

Re: LG LED TV diagnostic help please

Posting pictures of the back of your tv showing the boards with clear pictures may help you more with fixing your problem

[vinceroger69]

Re: LG LED TV diagnostic help please

what are the mainboard and power supply board numbers? we can then look for common issues etc and run some tests but as above post please upload some good clear pictures of the boards used in your tv one showing all the boards and how there connected and one of each board used in your tv please remember we have not got the tv in front of us we use the information you provide to us.

[ReeceyBurger123]

Re: LG LED TV diagnostic help please

Psu solder joints, provided us with no votages at all so how the hell are we supposed to guess. Check psu solder joints if all fine test Pson etc.

[vinceroger69]

Re: LG LED TV diagnostic help please

is this tv out of warranty? it looks looks its quite new 4k set

[Diah]

Re: LG LED TV diagnostic help please

its firmware issue, LG pushed new update this month, download it and update your TV, after update done, dont forget go to setting and reset it to factory and let it new system install ch. etc.

[MattM]

Re: LG LED TV diagnostic help please

Hi,

Thanks very much for all the replies.

It terms of the firmware I updated that to the latest firmware and reset etc but will give that another go now.

Unfortunately the TV is not in warranty.

The PSU board number is EAY63709401 and the mainboard is EBT63494402.

I will try to work out how to post pictures that I have taken of the boards but I am not sure it will let me as a new member.

I do appreciate the problems of remote diagnostics and thank you for the replies.

Matt

[Moreno83]

Re: LG LED TV diagnostic help please

You can use the advanced option and choose the paperclip function. Upload the pictures.

Did you reset the tv to the factory settings after firmware update?

[MattM]

Re: LG LED TV diagnostic help please

Hi,

I have re-flowed some of the joints on the PCB although nothing looked obvious to me and it was to no effect.

I have been unable to get the TV up to the menus to try the reset again but it was reset I cannot remember whether before or after the update though.

I have taken photographs of the boards and detail of the PSU.

Thank you again

Matt

[Diah]

Re: LG LED TV diagnostic help please

also when you first tun on LG Logo show on the screen, then screen go black. LED indicatore at the front of TV blinked 3 time .. right?

you have on the PWB small green light near the section of going to backlight sockets.. did it turn on green ? or not.

did your backlight keep on after the LG show on the screen... yes or not ?

[Diah]

Re: LG LED TV diagnostic help please

BTW: clean the BLACK backlight socket on PWB it look on photo it had silicon contact between 2 pins

[MattM]

Re: LG LED TV diagnostic help please

Hi

Thanks for the message.

When power is applied to the TV the red standby light comes on. Pressing the standby button on the remote brings up the LG logo for about 1 second then the screen goes black but there is a faint glow from the TV so maybe the backlight is still on. At the same time there are three flashes from the standby light. The cursor from the magic remote will come on the screen and move around the screen with the display lighting where it is pointed but it seems now to be unable to do anything more than that. The LED on the power supply board was off at all times.

Thank you

Matt

[Diah]

Re: LG LED TV diagnostic help please

firmware issue ( Main Board )

before you replace main board try to use apk from google play Smart remote on galaxsy S5 as it had RF sender or any android mobile had RF sender.. when set up LG TV on the apk. use command IN_STOP it will reset it to virgin state

[MattM]

Re: LG LED TV diagnostic help please

Thanks very much, I have ordered up a new main board and will give that a try and report back. Thanks again

[MattM]

Re: LG LED TV diagnostic help please

With thanks to the posters here I replaced the main board and the set is fine now. Thanks again