Lg 60uf7300-ut

[RDC55]

LG 60UF7300-UT 4K TV - does this look savable or is it likely the panel? It is being offered for $200, which seems a bit high either way.

Thanks in advance for any input.

[freakaftr8]

Re: Lg 60uf7300-ut

That's an interesting one. it's spread across the whole panel, I'd say tcon at the very least. Panel is prob ok

[RDC55]

Re: Lg 60uf7300-ut

OK, so I decided I needed another project and brought this one home. Things have changed though as currently it has no back lights or video.

I measured the power supply voltages and all appears normal excepting DRV_ON, which I suspect should be high - PDF attached of measurements. Note the SIN, SCLK, and VSYNC attach to the TCON.

Note on the main CCA the DRV_ON command changes name to INV_CTL, and is controlled by a 48 pin MCU R5F100GEAFB#30 - PDF attached.

There is also an LED on the power supply that flashes a sequence of 5 flashes. It connects to a 44 pin micorcontroller MC93F5616 and I could not locate a data sheet on this in an attempt to reverse engineer. I also could not find anything on this in the service manual.

I seem to have a knack for picking an assembly that does not have parts readily available. I suspect with the noted DRV_ON signal that I would need to change the main CCA. The best I have found is $400 for a new, which is way out of range.

So, since I am new to the LCD TV repair I am hoping for some direction on something I might be overlooking.

[freakaftr8]

Re: Lg 60uf7300-ut

Bet that it is a BGA solder connection failure underneath the main processor on the main board.

Heat up the main processor on the main board and try to power on

[RDC55]

Re: Lg 60uf7300-ut

I did try heating it earlier with a heat gun, no where near melting point of solder though just warm / hot to the touch and no change.

I should have also asked about the reset switch on the main CCA. It is labeled SW3000 and resets the MCU where INV_CTL originates. The back lights will flash on momentarily and the set will shut down (PWR_ON goes low)when the switch is depressed.

Any clues about the flashing LED on the power supply?

[hasun100]

Re: Lg 60uf7300-ut

Hey did you end up figuring out what the issue is? i have the same problem with this tv, 5 flashes on the power board, no image or l.e.ds on or sound.

My suspect is the main board but dont want to spend 200+ dollars on the wrong part. Any help would be appreciated

Thanks!

[nomoresonys]

Re: Lg 60uf7300-ut

With power cord unplugged, unhook cable from powerboard to mainboard, plug power cord back in powerboard, see if backlights come on and stay on, report here then with all boards and everything hooked back up, do test #3 in my signature below, #2 shows test procedure if needed, try to follow and report just as instructed.

[hasun100]

Re: Lg 60uf7300-ut

Hey I tried to unlock the Main board from the power supply. The led.s stay off. If i shine a light i dont see any video as well. There is a little reset switch on the main board, if i press that I see the lights come on for a brief second and tv shuts off. There is also a blinking light that flashes 5 times on the power board.

[RDC55]

Re: Lg 60uf7300-ut

Darn, I thought I updated this with the fix as the OP. I ended up replacing the main CCA with a purchase from Ebay advertised as 'unknown" for $45 USA. All was well with the TV after that and I was lucky to find a main for such a low price.