LG 43UF640V half picture

[Davi.p]

Re: LG 43UF640V half picture

Tcon input signals are not generated by any other than mainboard, only SDA returns back to mainboard but dont affect image, so to be safe change first tcon...

[freakaftr8]

Re: LG 43UF640V half picture

My thought is replacing T con is a temporary fix. Main board maybe sending too much voltage or over driving data signals into one side of the T con. So inevitably mainboard root cause. Just a thought.

Especially after hitting the main board cause different variations on that side of the screen makes me think a drifting resistor to the T con from the maid board might be in order

Glad to see it's working now!

[london-freddie]

Re: LG 43UF640V half picture

hi thanks for that guys everything appears to be working fine now on this tv including all remote functions
yes when I replaced the tcon I think the second time it did work for a short while then went bad again, so not sure if main had killed the replacement tcon
I would love to know which board caused the fault but am reluctant to risk damaging these replacement boards by mix and matching

[budwich]

Re: LG 43UF640V half picture

now that is better,
advice now please guys do i risk trying my power board and tcon with this mainboard to try and determine which board is at fault

not sure that I would do that just yet. IF I recall, earlier in your thread, you replaced a tcon and "post replacement", the set worked for "5 minutes" and then you were back to "half / half". I assume now that you have checked out the functions in terms of remote and such... inputs, etc. to see that they are working normally.

I would think a bit more about what "setup" is what... since some of these didn't work with the other thread. Maybe its more of a "initialization" issue than anything... my first guess is some form of eprom "issue" either reading or otherwise such that the main gets corrupted and can't readily recover.

PS... glad you got to a working set.

[tom66]

Re: LG 43UF640V half picture

Half picture unlikely to be caused by a power board fault. So you could probably rule that out.

T-con/main is the difficult one. Pretty unlikely for either to damage each other, but small chance.

[vinceroger69]

Re: LG 43UF640V half picture

Glad you fixed the tv it would be nice for future readers too know what board fixed the issue but its your own choice if you risk swapping boards around and possibly causing further issues.

[london-freddie]

Re: LG 43UF640V half picture

now that is better,
advice now please guys do i risk trying my power board and tcon with this mainboard to try and determine which board is at fault

[london-freddie]

Re: LG 43UF640V half picture

tv is working using boards supplied by daz2206, I changed all ie: power, main and tcon so not sure which one yet has fixed it.

[budm]

Re: LG 43UF640V half picture

T-CON info.
https://www.badcaps.net/forum/showpo...&postcount=354

[london-freddie]

Re: LG 43UF640V half picture

thanks for that help tiku

[tiku]

Re: LG 43UF640V half picture

i wonder if is the case of purchase a service manual, to see at least the pinout of the mainboard lvds out, by that one can judge if the video out is splitted in 2 half screens or not like all HD-FullHD tvs..

Here is the Service Manual Of Your Model.

[london-freddie]

Re: LG 43UF640V half picture

quick update on this tv
I have got nowhere with this tv, eeprom reset, baking mainboard, tcon change twice.
however daz2206 is sending me a set of boards for this tv to try
so will post with result if replacement power, mainboard or tcon sorts the problem
thanks to darren again for his help on this

[daz2206]

Re: LG 43UF640V half picture

I couldn't send a pic via pm so can you check thes are the right parts for your tv and il post them to you

[Davi.p]

Re: LG 43UF640V half picture

i wonder if is the case of purchase a service manual, to see at least the pinout of the mainboard lvds out, by that one can judge if the video out is splitted in 2 half screens or not like all HD-FullHD tvs..

[london-freddie]

Re: LG 43UF640V half picture

ok just had mainboard in oven 180 for 5minutes, no change,

[Davi.p]

Re: LG 43UF640V half picture

A new eeprom costs few $ but i have no idea, depends on how much time you can invest on this set, but i don't understand you, before i have said it to you, you claimed you need a new mainboard, so this mainboard is for the trashcan, what do you lost? and second, the other person with equal issue said he have warmed the mainb. and the defect changed, this is not related to a memory.. sure..

[vinceroger69]

Re: LG 43UF640V half picture

if you dont fancy trying the oven reflow method until you have ruled a eeprom issue out, maybe try heating the cpu/main ic up with a hair dryer for a good few minutes see if that changes anything.

[london-freddie]

Re: LG 43UF640V half picture

have baked mainboards before, laptops, not wanting to put this one in the oven, maybe as a last resort, do you think maybe try a new eeprom ??

[Davi.p]

Re: LG 43UF640V half picture

The reset on pin 5,6 is a safe operation, many times tested and never problems, sometimes works sometimes not, depends on eeprom type. On the tv Italian forum i have read yesterday of one of the various LG defects related to mainboard, the user cooked the board in the oven for 5 mins at 180 Celsius degrees and now is 1 week that works, he have cooked another on LG mainb. 1 year ago and it is still working.. It has to be removed all the soft plastic parts that melts..

[london-freddie]

Re: LG 43UF640V half picture

tried eeprom reset again pins 5 and 6, now lost sound and picture, still no remote functions except power on and off
looks like i need a mainboard