LG 50PC1DA problem

[coopigeon]

My tv has started doing this. Any help would be greatly received. The white block bounces around the screen

[tom66]

Re: LG 50PC1DA problem

See here:-
http://blog.coppelltvrepair.com/2010...-lines-in.html

[coopigeon]

Re: LG 50PC1DA problem

Very informative thanks for quick reply. To save hassle there are loads on ebay but narrowing it down to the right ones im srruggling with. Typical come in pairs both upper n lower but which ones to buy ? These are tested but if there is a better option im missing be great to know

[tom66]

Re: LG 50PC1DA problem

You could also repair your board. You need to test each buffer as detailed in that link to see which is bad. eBay boards are a crap shoot. A great deal do not work at all.

[coopigeon]

Re: LG 50PC1DA problem

Thx tom. Is that par for course with ebay. ?Just trying to remember if I still got a multi meter from me mechanicing days . Im reading and posting from the pub so ill take a better look from lappy when I get home. As regard repairing how inticate is the soldering etc needed ? Again used to virtual blowtorch soldering than electronics

[tom66]

Re: LG 50PC1DA problem

If you've never soldered then you're best having someone else do it as it is fairly tricky work. I've done a similar board before, it's best with hot air. The repair cost is under £10 mostly, the FETs are usually cheap parts.

I've had good and bad luck with ebay boards. Generally there are only a few companies and individuals on there which test their boards well. The boards are also quite expensive due to the high failure rate.

[coopigeon]

Re: LG 50PC1DA problem

Im the guy who leaves the iron on too long and bugers something else...got a steady hand probably one of the only times ya can say its the tools and not the user and they are prehistoric soldering iron.

[coopigeon]

Re: LG 50PC1DA problem

Just for my knowledge what are FETs and is it these that you replace ?

[tom66]

Re: LG 50PC1DA problem

They are the three-leaded (if including the metal tab) devices at the top right of the board.

[coopigeon]

Re: LG 50PC1DA problem

Thx tom .will investigate when I return home.wts

[coopigeon]

Re: LG 50PC1DA problem

Hi where can I buy these in u.k ? Is there a repair kit.see pic ?

[tom66]

Re: LG 50PC1DA problem

£10 from China for 10.
http://www.ebay.co.uk/itm/10PCS-FQB4...-/261101491264

[coopigeon]

Re: LG 50PC1DA problem

Hi tom ..this guy in link you sent is away. Is there anyobe else ? Alternativekt I have found some with right specs I.e 150 v 45.6a that are all but same number however pic looks like they have 3 legs and a taller top

Part no 671-5124 at rs components online website

[coopigeon]

Re: LG 50PC1DA problem

i cross referenced the part numbers and came up with this

http://uk.rs-online.com/web/p/mosfet...stors/6875125/

Is the 46.5a necessary?

[coopigeon]

Re: LG 50PC1DA problem

Ok so i waited for the chinese new year to pass and ordered a load of FETs for the telly . They arrived and i had 6 new ones fitted to the buffer boards. On plugging back in bingo everything spot on .see pic 1

After two days i switched on and was watching telly for approx 2 hrs then the picture started flickering black and white , you could see a distorted pic through the black . if you press the menu button this was also messed up you could just make it out. I switched it off left it ten mins then switched back on and everythng ok. approx ten mins later it started again. sound is always spot on .

link to what tv does when flickering

https://dl.dropboxusercontent.com/u/...223_193232.mp4

any help appreciated

[Alastair E]

Re: LG 50PC1DA problem

video file is corrupt, but flickering dark mono/distorted colour picture suggests Z-SUS IPM failure.

[coopigeon]

Re: LG 50PC1DA problem

video file is corrupt, but flickering dark mono/distorted colour picture suggests Z-SUS IPM failure.

Hi When you say video file is corrupt what do you mean ? is it two separate problems potentially .. if there was an a to z where should i be going next .

thanks for your quick reply

[Alastair E]

Re: LG 50PC1DA problem

The video-file you linked to--doesnt work!!

--Replace the Z-SUS board.

[coopigeon]

Re: LG 50PC1DA problem

ahhh sorry i think i posted the link before it had uploaded to my drop box but is good to go now

[tom66]

Re: LG 50PC1DA problem

Hold on -- could still be a Y-sustain fault. You'd want to check the -Vy, Vsc and Vzbias voltages to be sure... post a picture of the sustain boards if you need help with this.