LG 32LX1D will not turn on

[MdPhoenix]

Re: LG 32LX1D will not turn on

I assume when you want the 5v rail resistance measured, we're talking from ground to the 5v standby? From a ground pin, to standby I get a slow build up in resistance. It stops at 9.3k.

I didn't ask if AC or DC across gigantocap. I can't tell if it's before or after the rectifier. Anyway, I get 157DC. Nothing on AC.

[momaka]

Re: LG 32LX1D will not turn on

I assume when you want the 5v rail resistance measured, we're talking from ground to the 5v standby? From a ground pin, to standby I get a slow build up in resistance. It stops at 9.3k.

Yeah, that's it. Measuremet looks good. I just wanted to make sure there isn't something that's shorted on the 5V standby supply, thus causing it to turn on and off like it does now.

I didn't ask if AC or DC across gigantocap. I can't tell if it's before or after the rectifier. Anyway, I get 157DC. Nothing on AC.

Yeah, it's DC. AC across an electrolytic capacitor =

If the 157V DC is stable and not oscillating, then your problem is likely that standby start-up cap budm circled.

[MdPhoenix]

Re: LG 32LX1D will not turn on

Awesome. Consider that guy replaced tonight.

And duh. Electrolytic Cap = DC. hurrr.

I used to be good at this stuff in High School. I just kinda strayed. Need to get back into it.

Thanks for the help. Stay tuned.

[MdPhoenix]

Re: LG 32LX1D will not turn on

BOOYA! All fixed guys! I can't thank you enough! Free TV on Craigslist, some talented individuals, a tiny replacement part, and now my kids have a decent TV for their game room.

Thanks so much again!

[momaka]

Re: LG 32LX1D will not turn on

Congrats on the fix!
Feels good, doesn't it?
If you ever get random flaky problems with that TV again, I would suggest you also change the rest of the caps as SAMYOUNG and SAMWHA are not very reliable. But other than that, enjoy!

[MdPhoenix]

Re: LG 32LX1D will not turn on

Yeah man. Pretty awesome. I fix monitors with blown caps a lot. But hunting down something like the good ole days - that's something special. I've got another TV somewhere around here. I'll start another thread for it.

Thanks again!

[dj_ricoh]

Re: LG 32LX1D will not turn on

omg! its like the ending of "inception"!!!
so the 5vstby cap?? :-s

[MdPhoenix]

Re: LG 32LX1D will not turn on

Yup. It was. But getting to it was educational.

[momaka]

Re: LG 32LX1D will not turn on

so the 5vstby cap?? :-s

You'll be surprised how common it is for them to go bad. And not just in TVs, but in almost all power supplies that use inferior caps. For this reason, I always keep a small pack of 50V 47 uF caps.

[budm]

Re: LG 32LX1D will not turn on

Glad to hear it was just the bad start up cap.

[Giga]

Re: LG 32LX1D will not turn on

So I am pretty much in the same boat. I got a free tv off Craigslist and it won't start up. Not even a blink. So I checked the ceramic fuse by replacing it but nothing. So then I searched google and landed here. I got as far as removing all the covers but when I took a look at the 5vstby cap it had two. One is 47uF and the other, smaller one is 22uF. Any ideas as to whether I should change both? Thanks in advance. See attached photo.

[momaka]

Re: LG 32LX1D will not turn on

Any ideas as to whether I should change both?

Wouldn't hurt one single bit. The more of those SAMWHA and Sam Young capacitors you change, the better anyways.

I would say check the voltage on pin ST5.0V first. If you do NOT get 5V, then definitely replace both of those small caps. And if you get absolutely no voltage on ST5.0V (like not even 1V), then check the voltage on the big primary cap (see post #19). Also check resistance on ST5.0V rail (remove power first, as mentioned in post 19 again).

[asperfud]

Re: LG 32LX1D will not turn on

Just opened up GFs 32lx1d that had no power, no red led,nothing.

Googled the model number, and knew the 'badcaps' result was the one I wanted.

Had around .6~.9Vdc on ST5.0v.

Scavenged a 47uF 63v from something in the junk box, and the tv is back to health.

Sure is nice to have a resource like this on the web.

[ludespeedny]

Re: LG 32LX1D will not turn on

I think I have the same problem with the 2 caps in the pic, where can I get replacements and I also think the resistor R125 is bad too, what do you think?

[newtothis]

Re: LG 32LX1D will not turn on

I think I have the same problem with the 2 caps in the pic, where can I get replacements and I also think the resistor R125 is bad too, what do you think?

What makes you think the resistor is bad?

[ludespeedny]

Re: LG 32LX1D will not turn on

the 2nd pic shows the backside of the board and almost looks like burn marks

[newtothis]

Re: LG 32LX1D will not turn on

I don't even see R125 on that second pic, nor do I see anything that resembles burn marks?

[ludespeedny]

Re: LG 32LX1D will not turn on

Sorry wrong pic, should be this:

[newtothis]

Re: LG 32LX1D will not turn on

Thats just probably varnish or flux... Do you have a DMM?

[ludespeedny]

Re: LG 32LX1D will not turn on

Yeah, the measured voltage across the wires on each capacitor Small holds 12v, then rapidly falls off. Large remains constant at less than .3v.