Lg 42pj350

[ReeceyBurger123]

Hello everyone, today I have this 42" Lg Plasma Tv that came in originally with "clicking fault" turns out the Ysus has shorted igbts. I replaced all the devices that shown as shorted on my meter, removed them, mounted new ones on heatsinks with silicon paste and resoldered them to the board. At the same time I also checked the buffer card and Zsus they check fine nothing obviously shorted, normally on lg sets the Ysus never seems to kill the buffer from my experience ? However plugging the set in it fires on, panel primes and discharges but there is a white band at the bottom of the set then after a few seconds it shutdown. If I unplug the bottom half of the screen the white band moves to the top of the set and it still shuts down however if I unplug all the connectors going from the Y buffer going to the PDP all together it doesn't shut down at all. All the voltages are correct and im sure that its not the control board either. If anyone has any ideas let me know thank you.
Photos provided below.

[ReeceyBurger123]

Re: Lg 42pj350

Right more messing found that the VSC is pulsing up and down and that the buffer chips are getting very hot so guessing that the buffer is toast and that possibly Ysus so going to double check.

[ReeceyBurger123]

Re: Lg 42pj350

Any one ?

[sordids999]

Re: Lg 42pj350

check the Z-SUS board high power copper inductor to see if there is any cracked solder joints

[ReeceyBurger123]

Re: Lg 42pj350

Ok will do cheers.

[ReeceyBurger123]

Re: Lg 42pj350

Ok so fixed the set today, was due to cold solder joint on the Zsus on that coil, there was a huge ring crack around the leg of it, used my meter to see if it was connected to the pad at all and it wasn't at all. After re-soldering that by adding fresh solder removing the fresh solder with the de-soldering gun I then scratched around the pad to expose the copper and spun some solid copper wire around the leg of the coil then flooded it with solder to help reinforce the joint. Lg should have riveted that coil in the first place as it has a lot of current flowing through it. I also reinforced the joint on the same coil on the Ysus just to make sure its not going fail in the future. I have a feeling that the reason why the Y sustain Igbts and diodes failed was due to the Zsus coil breaking off which caused them to get overloaded and go short.
Overall £30 in parts and now a decent tv charged £120 for repair and now a happy customer hopefully wont be failing any time soon. Cheap Lg junk built to fail now at least its working until something els fails. Thanks for the input really helped.

[sordids999]

Re: Lg 42pj350

glad it worked

[ReeceyBurger123]

Re: Lg 42pj350

glad it worked

Honestly thank you mate, got another one to do same fault