Lg 55uk6950plb

[comptek]

Hi everyone, I have an LG 55UK6950PLB, it started off with the LG logo then top top left hand corner HDMI2 comes up then fades away then just sound. Onboard t-con board not separate.

I found a metal can capacitor at the top of the board in line with the LVDS sockets I measured 32 volts and it dropped off, I removed the ic below it and no picture so I assume it's needed lol, but the 32v still dropped off.

I then removed IC9400 a 24 pin package and all the voltages stayed up and the screen works it's watchable besides some feint lines on the right hand side that seem to flicker depending on what's displayed like a red background or light blue for example..

I have been trying to find out what the ic is or does from what I can see the ic is
3U=6AFHE or the F could be a warn out five I'm thinking it's a voltage regulator?

Any help would be appreciated thank you

Gary

[lotas]

Re: Lg 55uk6950plb

Not she?
3U=xxxx - RT9553A
(RICHTEK)

[comptek]

Re: Lg 55uk6950plb

Hi Lotus definitely looks like a “F” looking at it again ��
Thanks Lotas

[comptek]

Re: Lg 55uk6950plb

Is there a schematic for the board as well I couldn’t find one thanks

[lotas]

Re: Lg 55uk6950plb

What I posted on the marking matches, but it doesn't match the pinout and the number of pins, I only found a voltage map for it.

[comptek]

Re: Lg 55uk6950plb

Thanks Lotas I will keep hold of them and check caps tomorrow maybe a cap is short knocking the ic out thanks for your help so far, and hopefully someone will have a schematic,
The panel is likely to be faulty but it's interesting to see if I can make it better
The lines are horizontal and evenly spaced down the screen,

[dskall]

Re: Lg 55uk6950plb

By your voltages it looks like a gamma chip.

[comptek]

Re: Lg 55uk6950plb

By your voltages it looks like a gamma chip.

Hi dskall
The tv is working without the IC9400 in place I was just wondering what the purpose of IC9400 is just that it has flickering feint lines down one side, it's kind of watchable
Thanks Gary

[dskall]

Re: Lg 55uk6950plb

I told you what chip I think it is. Maybe some alcohol and some side lighting of the chip will enable you to read number.

[comptek]

Re: Lg 55uk6950plb

I told you what chip I think it is. Maybe some alcohol and some side lighting of the chip will enable you to read number.

Hi Dskall, I'm well aware you suggested that it could be the Gamma ic, but would it cause horizontal lines on the right hand side of the screen, I always thought gamma ic's that have gone faulty cause a white screen….
My question was what does the ic in postion IC 9400 do what is it's job?

It seems to be labelled 3U=6AFHE (see photo)

Kind regards
Gary

[comptek]

Re: Lg 55uk6950plb

Are there any schematic diagrams about for this please

Regards
Gary

[comptek]

Re: Lg 55uk6950plb

Boost

[dskall]

Re: Lg 55uk6950plb

Unless you can find a datasheet for the chip unlikely you are going to get much more help.

[comptek]

Re: Lg 55uk6950plb

Unless you can find a datasheet for the chip unlikely you are going to get much more help.

Hi Dskall yes it seems that way doesn't it, oh well I will keep hunting

Thanks for your reply and input much appreciated

Regards
Gary

[zwarder]

Re: Lg 55uk6950plb

I have this tv on the bench & blocked ckv lines which got it to work however after 5 minutes the screen corrupted & the set switch off.
This was followed by the psu blinking 8 times.