Lg 42ld490-zb

[sordids999]

Hi guys
just wondering if anyone has seen this fault before i cant post pictures until tomorrow of the boards due to not picking it up until then but i can post a screen shot of the screen

thanks

[tom66]

Re: Lg 42ld490-zb

The one thing it reminds me of is a 720p main board being installed in a 1080p TV. Since the system menu would appear inaccesible, it would be quite hard to reset (short of installing a new board)

[sordids999]

Re: Lg 42ld490-zb

ok thanks m8 ill post some pictures tomorrow

[sordids999]

Re: Lg 42ld490-zb

right pictures uploaded i have tested the tcon voltages which are fine

voltages are good as well

NC 0.00 ERRON 0.00
12v=12 volts P-DIM=1.0 volts
12v=12 volts A-DIM=1.4 volts
12v=12 volts INV ON/OFF 2.8 volts
GND GND
GND GND
3.5v=3.2 volts 3.5v=3.2 volts
3.5v=3.2 volts 3.5v=3.2 volts
GND GND
GND GND
20v=20.6 volts 20v=20.6 volts
20v=20.6 volts POWER-ON 3 volts

thanks

[sordids999]

Re: Lg 42ld490-zb

update: if i use a hair dryer on IC100 then the image comes back it seems once warmed up
so question easy to change ?
struggling to find a replacement board anywhere though

[sordids999]

Re: Lg 42ld490-zb

picture uploaded

[tom66]

Re: Lg 42ld490-zb

Not at all easy to change. You could perhaps get it reballed if you know someone with the gear, similar repair to Xbox360/PS3 lights-of-death symptom.

[freakaftr8]

Re: Lg 42ld490-zb

I've had some luck reballing and using a hot air rework station that I have. I've had hit or miss issues with the older lg 720p plasma logic boards when the blue red and green vertical bars that show up. But it's iffy. You could always try if you knew someone that had a rework station if not just buy a new board

[sordids999]

Re: Lg 42ld490-zb

if not just buy a new board

thats the problem im struggling to find one though

[tom66]

Re: Lg 42ld490-zb

If you can't find an exact board, it might be possible to swap over that flash chip with the sticker on it, to the new board. This would essentially convert one board (even if it was, e.g. a 32" 720p board) to the same specification as your new one. Does require things like HDMI ports to be the same though, so watch out.

What are the part numbers EBR/EAX you are looking for?

[sordids999]

Re: Lg 42ld490-zb

Eax61531909(2)

[tom66]

Re: Lg 42ld490-zb

I will check my pile, though I don't recall tearing down one of these. I can ask a friend if they have one in their respective pile.

[sordids999]

Re: Lg 42ld490-zb

thanks m8

[tom66]

Re: Lg 42ld490-zb

No match in my pile, sent a text to a friend, but will have to see what he says in the morning.

[sordids999]

Re: Lg 42ld490-zb

So due to still not finding a mainboard for this tv i done a reflow today and the tv is now working fine,so anyone had any experience how long this will last until i find a replacement board ?

[tom66]

Re: Lg 42ld490-zb

I had one reflow on my graphics card last a month. Some have lasted years, others only days.

[sordids999]

Re: Lg 42ld490-zb

ok thanks tom just wanted a rough idea first time i tried this so was unsure

[Ciri781]

Re: Lg 42ld490-zb

Hi guys
Anyone have a schematic for eax61531909(2) please?