LG 42ln578v-ze problems

[Diah]

Re: LG 42ln578v-ze problems

you are not going to repair t-con right ? then change it from good source working one.

[budm]

Re: LG 42ln578v-ze problems

You can try new T-CON board.
You can also check some of the Voltages at these test points:
VCC
VDD
VCC18
VGH
VGL
HVDD

[jmh474]

Re: LG 42ln578v-ze problems

You can try new T-CON board.
You can also check some of the Voltages at these test points:
VCC
VDD
VCC18
VGH
VGL
HVDD

checked voltages this morning, voltages are

VCC - 3.3v
VDD - 0v
VCC18 - 0v
VGH - 0v
VGL - 0v
HVDD - 0v

[flocko]

Re: LG 42ln578v-ze problems

Check voltages again this time with the ribbon disconnected that gave you the lines on the screen. see if they come up? but looking like short on the driver board to panel

[jmh474]

Re: LG 42ln578v-ze problems

ok so checked the t-con card again i was getting the same with both ribbon cables disconnected one at a time but when they are both disconnected i get,

VCC - 3.3v
VDD - 15v
VCC18 - 1.8v
VGH - 28v
VGL - 5v
HVDD - 8v

[dick_barton]

Re: LG 42ln578v-ze problems

check voltages again this time with the ribbon disconnected that gave you the lines on the screen. See if they come up? But looking like short on the driver board to panel

It does look like there's a panel problem.

[jmh474]

Re: LG 42ln578v-ze problems

ok thanks for every ones help, i guess its onto the next one lol

[flocko]

Re: LG 42ln578v-ze problems

Before you move on take the outside screen surround off, and check driver boards for damage, you could still find a fix.

[jmh474]

Re: LG 42ln578v-ze problems

Before you move on take the outside screen surround off, and check driver boards for damage, you could still find a fix.

ok ill have a look, what sortr of thing am i looking for? iv never gone that deep into a tv befor

[ReeceyBurger123]

Re: LG 42ln578v-ze problems

You need to strip the fram off the Lcd glass whilst being VERY careful, then get us an image of the boards that are bonded to the Lcd screen please.

[ReeceyBurger123]

Re: LG 42ln578v-ze problems

Also here is a tip if your starting a Tv business, never buy Tv's with lines on the screen and especially Led Tv's with sound, backlight but no Lcd image most of the time its the panel which if thats the case mares well scrap the set as finding a replacement panel is almost impossible and the boards bonded to the screen are actually non serviceable unless you have the right equipment which costs thousands.

Can I ask to have you ever fixed a flat panel Tv before this ?

[jmh474]

Re: LG 42ln578v-ze problems

Also here is a tip if your starting a Tv business, never buy Tv's with lines on the screen and especially Led Tv's with sound, backlight but no Lcd image most of the time its the panel which if thats the case mares well scrap the set as finding a replacement panel is almost impossible and the boards bonded to the screen are actually non serviceable unless you have the right equipment which costs thousands.

Can I ask to have you ever fixed a flat panel Tv before this ?

tv done about 20 tv's just replacing caps, power boards, t-con card im only really just starting to get into it so learning alot.

think iv found the problem.....

[dick_barton]

Re: LG 42ln578v-ze problems

go deep to the panel taps and check if there water damage or burn before you go to change T-CON

So that's the problem.

[flocko]

Re: LG 42ln578v-ze problems

looks like someone has over done the cleaning of the screen , but all other parts should be good the T.Con tested fine with the ribbons disconnected so the driver board damage was just loading T.Con down. Good luck and keep us updated how you get on with your next repair

[ReeceyBurger123]

Re: LG 42ln578v-ze problems

Ahh dam panel is done for then common on these, people are not careful when cleaning them