Finding a short to ground using this special technique.

[ytmachx]

I love to see something repaired instead of going to the trash. It seems few of us have the necessary skills though.

[BuxMediaVideo]

I have a Legend (Prima) 42" LCD TV (LEC4227) that I am trying to repair. The funny thing is that this video here almost describes the problem I am having with this certain TV. I have posted my question on Fixya.com. The standby power is on, I turn on the TV and the red LED turns blue. I know that the power supply is doing its job, I even checked all the capacitors, they are good and the PSB,T-Con and Main. I never did check the pico-fuse(s)! Sadly, all I did was a visual inspection for bad caps.

[uxwbill]

That's a great tip. I'll have to keep it in mind.

[fddizon1]

awesome technique... big thanks dave

[Maxxarcade]

Awesome technique!  I wonder if the short was actually after the mosfet somewhere, and that is what originally killed it?

[GrantsPassTVRepairs]

@Maxxarcade Yea it did have a short after mosfet as well, and that probably was the reason it went bad.

[citizensbandman]

Do you have any luck removing and replacing smt componets?

[GrantsPassTVRepairs]

@citizensbandman Yes It's not to hard if you have the correct soldering tools. Youtube is full of tutorial videos on soldering SM components.

[krgrubbs]

so did it work?

[GrantsPassTVRepairs]

@krgrubbs In this case there were additional problems on the output side, but nevertherless the technique can be extremely helpful.

[agoodm]

Very interesting, did you wind up fixing this display?

[GrantsPassTVRepairs]

@agoodm Sadly I didn't fix the TV but I still though this technique was worth sharing.

[AeroDurbanite]

Good Job.Thanks for sharing.

Also check the other surrounding components as well Dave.I'm sure you know this anyway.

I'm building a serial eeprom chip programmer & a fuse trip switch for low voltages right now.I'l let you know if it works out.May come in handy.

[linagee]

100% ingenious!

[banjax66]

The first component that defrosted was the first one you blasted with freezer spray.

Maybe because it was the first to re-warm?

[GrantsPassTVRepairs]

@banjax66 Not in this case. The mosfet was hot enough to burn my finger.

[MrBogs88]

Big thanks for another good technique. Sir can i use the freeze spray direct to the component when the unit is on? Thanks

[GrantsPassTVRepairs]

@MrBogs88 It's generally safe to use freeze spray when the power is on.

[ynotsail]

Great idea, I will remember that one.  Thanks.

[zell318]

Nice tip, those main boards are always a pain to work on.