LG 60PZ570T-ZB distortion

[sealover1]

Hi I have an LG 60PZ570T-ZB its around 5 years old and the colour has started to distort.

for some reason it don't seem so bad if at all if I play a DVD but did see a slight problem when using DVD



can anyone help please?

[tom66]

Re: LG 60PZ570T-ZB distortion

This is a well known issue.

TURN OFF your TV before the damage becomes worse and do not use it or you will have to replace a £150 board.

If you turn it off now and begin the repair, it will only require a little solder rework on the bottom of the Y- and Z-sustain boards.

Post a picture of the TV with the boards removed.

You will need a soldering iron, solder and wick, the soldering is easy as the devices are large.

[sealover1]

Re: LG 60PZ570T-ZB distortion

Hi Tom thanks for getting back to me I was hoping it would be you as been reading a lot of your posts on the LG TV's problem solving you really do seem to know your stuff

I have been self taught fixing computers before for some years so know a little about boards and stuff but never took a TV apart before so this will be my 1st go at this. no ideal what a y- and z- sustain board is so will take photos of them before removing if its ok got work out how the back come off 1st lol

again thanks for your help be back with photos shortly will see if I can turn the tv around on my own as its quite big and there not much space to turn it

[sealover1]

Re: LG 60PZ570T-ZB distortion

Hi Tom66 heres the back of the TV with all the boards showing. can you tll me which are the Y- and Z-sustain boards I need to remove and take a photo of please?

many thanks for your help

[Alastair E]

Re: LG 60PZ570T-ZB distortion

Y-SUS and Z-SUS will need removing and the ERC Coils re-soldered.....

Z-SUS on the right, Y-SUS on the left. ERC Coils are the heavy thick wire coils on both boards....

[sealover1]

Re: LG 60PZ570T-ZB distortion

Y-SUS and Z-SUS will need removing and the ERC Coils re-soldered.....

Z-SUS on the right, Y-SUS on the left. ERC Coils are the heavy thick wire coils on both boards....

Hi Alastair Thanks for helping.

so the large brown board on the left and the large brown board on the right/top have to come off.

I see the 10 or so screws holding the board on there and see how the leads come off but can you tell me how the white ports come out do they slide out once the screws are undone?

I take it these are the thick brown coils that will need re-soldered?

[/ATTACH]

[tom66]

Re: LG 60PZ570T-ZB distortion

Yes - you'll need to touch up the solder on all of them, and on both boards.

[sealover1]

Re: LG 60PZ570T-ZB distortion

and the white ports they slide out once the screws are undone do they tom66?

not done much soldering but do have a good one is this something a beginner could do? will look up some soldering techniques on youtube and watch 1st I think

[tom66]

Re: LG 60PZ570T-ZB distortion

This is something a beginner could do but if you have some scrap electronics spare I would recommend practicing first on other parts.

The white connectors will be a little tight - just gently wiggle the board gently from side to side to disconnect them. Leave the other boards screwed in or it will be much more difficult.

[sealover1]

Re: LG 60PZ570T-ZB distortion

ok will take one board off and see how I go from there.

Thanks tom66

[sealover1]

Re: LG 60PZ570T-ZB distortion

cant seem to get the white connectors to come out do they clip in as tried to gently wiggle them but there not coming loose

[newtothis]

Re: LG 60PZ570T-ZB distortion

They are just stubborn. Just keep at it

[sealover1]

Re: LG 60PZ570T-ZB distortion

lol your right I got the 1st right hand board out now was just worried about pulling on them to hard

[newtothis]

Re: LG 60PZ570T-ZB distortion

At the end of the day connectors can be replaced if broken (not that you want to do that) so don't worry so much about the pressure.. They do take a lot to get apart

[sealover1]

Re: LG 60PZ570T-ZB distortion

see what you mean now the solder is cracked on the coils

soldering lol I better practice that's a tiny place to solder only ever soldered twice and that was wires to wires

[newtothis]

Re: LG 60PZ570T-ZB distortion

What you are going to want to do is remove the old solder using solder wick/braid and the re-solder with new solder. Reason for this is that industry standard due to laws is to use non leaded solder which becomes brittle and cracks after expansion and contraction caused by heating and cooling... As leaded solder is more malleable this won't happen as easily.

[sealover1]

Re: LG 60PZ570T-ZB distortion

I'm not good at soldering to be honest and every time I have tried if its not just wires to wires I've not done to well if it were a case of just smoothing it over to seal the cracks I would be ok with it probably so might get someone and pay them a few pound to re-solder it properly for me rather then me mess it up but I'm really grateful for you guys letting me know what the problem is in the 1st place as I know people would just chuck the boards in the bin and buy new ones

think I will go find a small course on soldering as it seems I'm needing it more and more these days

a big thanks guys

[newtothis]

Re: LG 60PZ570T-ZB distortion

Its really not that hard, Damn my Mrs can solder ultra fine pitch IC's by hand!

Simple case of melting the solder and flowing some extra leaded solder to area to soften the solder and bring the melting point down (Unleaded solder melts at ~217c and leaded around ~183) then placing some solder wick against the solder for the coils and placing the soldering iron on top of the wick pushing it against the solder... The wick will soak the solder up... Move to a clean bit of wick... rinse and repeat until the solder lets go of the legs of the coils. Remove the coil then use wick again to clean the pads. Replace the coil and place the iron against the pad and coil leg and melt solder to it.

Honestly its not that hard to do

[Alastair E]

Re: LG 60PZ570T-ZB distortion

Soldering is easy--But doing those coils with a cheapo 15-20W iron--bloody difficult!

You'll need a good temp regulated 50W iron to do them properly, because the board tracks and the thick wire of the coils will suck away heat very quickly, leading to poor joints....

I use a 60W iron wound up to 450 degrees C when doing that type of work, using the extra temp gives a good shiny joint in a short time, rather than trying to do with lower heat that tends to scorch the board--as you need to heat for so much longer....

BTW--Give all the heatsinks and boards a damned good clean with a paintbrush to remove all the dust--this will help with airflow and cooling.....

[newtothis]

Re: LG 60PZ570T-ZB distortion

Soldering is easy--But doing those coils with a cheapo 15-20W iron--bloody difficult!

You'll need a good temp regulated 50W iron to do them properly, because the board tracks and the thick wire of the coils will suck away heat very quickly, leading to poor joints....

BTW--Give all the heatsinks and boards a damned good clean with a paintbrush to remove all the dust--this will help with airflow and cooling.....

I've done this gauge of coil with a cheapo 30w, Takes some heating I must admit.... Find it better to heat the board prior using a heatgun if needed (I use an IR now) from a good distance away, Aim is to warm the board up not attempt to melt the solder with it.... Takes less to get the solder upto temp