possible buy LG 55LX9500

[whatusername]

hi guys i have a chance to get a 55 in. LG LED 3D Smart TV for really cheap the tv powers on but no picture and it does have backlights.. im thinkin main board but cant find any available and do not see a tcon listed for it.. anyone familiar with these? and should i buy it?

[whatusername]

Re: possible buy LG 55LX9500

here are the ad pics and what they say about it


Im gonna say Broken TV .. .. it turns on its just nothing show .... chip on bottom left and top right
take it to a TV specialist to fix it or get lucky and make it work like i couldnt.

[whatusername]

Re: possible buy LG 55LX9500

Anyone? well anyway i decided to buy it it was only $40 so worth the chance. i have not opened it yet but will post pics when i do tonight.. hopefully i can find a fsm or at least some kind of trouble shooting guide for this one

[whatusername]

Re: possible buy LG 55LX9500

Woah i never seen anything like this.. They didnt skip a beat with this tv..

ok so this is what i have so far.. when i opened it i noticed main board ribbon cable to tcon was disconnected. i had backlights and static hiss from speakers.. when i re connected the cable to main board i no longer had back lights or static hiss.. but it did go through the power on cycle ... bad main board?

[Shinju]

Re: possible buy LG 55LX9500

Usually a bad sign when you open up a panel that a seller says "oh I never did anything with it ect" to find out stuff has been tampered with internally.

Could be mainboard or t-con, someone one has obviously been inside if the LVDS cable was disconnected.

I would reconnect it all and disconnected each side of the t-con and power it up and see if you get half screen.

Good luck!

[whatusername]

Re: possible buy LG 55LX9500

im thinking possible main board? the big heat sink in the middle of it gets hot to the touch with lvds disconnected.. if so no one has this board so i will need to try to do a repair on the component level. But i will need lots of help diagnosing the failed parts

[whatusername]

Re: possible buy LG 55LX9500

Usually a bad sign when you open up a panel that a seller says "oh I never did anything with it ect" to find out stuff has been tampered with internally.

Could be mainboard or t-con, someone one has obviously been inside if the LVDS cable was disconnected.

I would reconnect it all and disconnected each side of the t-con and power it up and see if you get half screen.

Good luck!

i tried what u said and no change.. i didnt get half screen

[Shinju]

Re: possible buy LG 55LX9500

When the TV is powered up and the LVDS is not connected have you hooked a source up to see if you get audio output?

[whatusername]

Re: possible buy LG 55LX9500

no but as stated i do get the static white noise sound and it does go up and down with volume biuttons with lvds disconnected

[whatusername]

Re: possible buy LG 55LX9500

i went back to check on it and it was on with backlights while everything hooked up xcept left ribbon cable for screen to tcon but still no half screen.. i reconnected everything again and will wait to see if it does it again

Edit: yes backlight do come on with everything connected. still no picture and sound and it takes like 5 min for them to come on

and how can i connect to see if audio works if i dont know what source input its on?

[Shinju]

Re: possible buy LG 55LX9500

Do you have something that you can connect to the coaxial input? Sounds like your mainboard is working if you can attenuate the volume of the no signal pink noise.

Did you check continuity of the fuse on the t-con?

[whatusername]

Re: possible buy LG 55LX9500

after leaving it on for a while with everything connected the pink noise sound came on but does not respond to volume buttons.. if i disconnect the lvds then it will respond to them.. and no i dont have coax to hook up im trying hdmi from tablet but no luck altho the tablet sound dissapears when i hook the hdmi to main board so its recognizing the hdmi has been plugged in

[whatusername]

Re: possible buy LG 55LX9500

Did you check continuity of the fuse on the t-con?

no because i have not been able to locate the fuse on the tcon board

[whatusername]

Re: possible buy LG 55LX9500

i think i found something here i used my cell on zoom and believe this is the fuse but look at components above it

[whatusername]

Re: possible buy LG 55LX9500

jesus im just guessing in the dark here... anyone have a schematic or know where i can get one or the fsm for this tv? LG 55LX9500-UA

i used my microscope to look at the above tcon board and that does not seem like the fuse and those components look ok with microscope.. i thought that middle resistor was burnt but guess not

[whatusername]

Re: possible buy LG 55LX9500

found this website http://servicemanuals.pro/serviceman.../download.html $5 for service manual

is this legit? or a scam site?

[whatusername]

Re: possible buy LG 55LX9500

i found a free fsm for the 55lx9500-TA instead if the Ua model it looks the same so i assume testing would be the same..
i found the 24pin cable to main and with the manual got the pin out and measured voltages.. readings are as followed
tested / tested
pin: 1 = power on tested3.2v / Pin: 2= 24v tested 24.5
3 =24v tested 24.5 / 4= 24v tested 24.5
5= gnd tested 0v / 6= gnd tested 0v
7= gnd tested 0v / 8= gnd tested 0v
9= 3.5v tested 3.3v / 10= 3.5v tested 3.3v
11= 3.5v tested 3.3v / 12= 3.5v tested 3.3v
13= gnd tested 0v / 14= gnd tested0v
15= gnd tested 0v / 16= nc tested 0v
17= 12v tested 12.2v / 18= inv.on 0v initially 15 min later when Bl turn on 3.0v
19= 12v tested 12.2v / 20=Le:nc Iop:Pwm Dim #1 tested 3.3v
21= 12v tested 12.2v / 22= Le:Pwm Dimm#1 Iop:nc tested 0v
23= nc / 24= Err Out tested 0v

[whatusername]

Re: possible buy LG 55LX9500

bump

[whatusername]

Re: possible buy LG 55LX9500

Bump im guessing not many people on here are familiar with these TV's?

[LGElectronics]

Re: possible buy LG 55LX9500

jesus im just guessing in the dark here... anyone have a schematic or know where i can get one or the fsm for this tv? LG 55LX9500-UA

i used my microscope to look at the above tcon board and that does not seem like the fuse and those components look ok with microscope.. i thought that middle resistor was burnt but guess not

Generally, LG, like other Consumer Electronics Companies will only release service manuals to Authorized Service Technicians but you may want to contact us at (800) 243-0000 and inquire about that.^IV