LG W2442PA-BF wont power on.

[Trune]

Re: LG W2442PA-BF wont power on.

R122 and r105 have silvery marks on top where others don't? They are near area of spark.
R105 reads 510 on the top, one way measures 2.88mohms, reverse reads -1.83
R122 reads not sure, one way measures 3.4mohms, reverse reads -2mohms.
C104 c106 smds look very white compared to other ones or is this normal?

May have found something, d102 gives readings both ways, 1170. Reverse reads 549.
I guess I should check that off circuit?

[Rtech]

Re: LG W2442PA-BF wont power on.

So lets have a recap....
The replacement Mosfet and fuses are fine, the resistor I sent was measured on my Fluke Auto ranging meter at 0.5Ω, so I did not take the Sleeving off to check value by colour code.Its possible that it may have been the wrong wattage, as after looking at the photo again,your original may well have been larger,so if that has blown it may be a possibility.You are checking D102 out of circuit ?? and how about the SMPS chip???

[Trune]

Re: LG W2442PA-BF wont power on.

That's correct. To be fair your right my multi meter is cheap and not quality like fluke.

But the bands are orange white silver gold green.
It's slightly shorter, maybe my original was 2w.

I'm going to check the diode out of circuit in a while.



I'm not sure how to check the smps chip, visibility it's okay. But it's a different model now so I may be able to find a guide on how to check it, couldn't find anything for the old one as I think it was a LG one,

[Trune]

Re: LG W2442PA-BF wont power on.

Diode is okay out of circuit.

[Rtech]

Re: LG W2442PA-BF wont power on.

Use http://www.alldatasheet.com/ for the info on the chip.

[Trune]

Re: LG W2442PA-BF wont power on.

C107 seems like a short to me.
It's a SMD.

Gives constant continuity both ways reading of 008.
With multimeter set to 200ohms it reads 5.9 both ways.

Not sure if I'm testing these correctly though. This cap is right near the smps chip tho.

[Rtech]

Re: LG W2442PA-BF wont power on.

Smd caps have a habit of going short cct somethimes so you will have to investigate further,,but not easy trying to deal with the very small smd components

[Trune]

Re: LG W2442PA-BF wont power on.

I took it off the board and tested the smd pads, the same readings occurred without the smd capacitor.

I think the smd capacitor is now destroyed by me too now, oops. Think I'm probably doomed now as cant find schematic for board and no way of finding out its rating to replace.

[selldoor]

Re: LG W2442PA-BF wont power on.

Ceramic caps ore often just replaced by same size as they are often unmarked.

[selldoor]

Re: LG W2442PA-BF wont power on.

Did you test d101 as well as d102 - there are also some zenerdiodes on the back of the board

[Trune]

Re: LG W2442PA-BF wont power on.

So just find one with similar dimensions?
I did test the zenerdiodes previously and some behaved as expected and others didn't, imagine this is because of being on circuit again but don't fancy testing them off circuit.

Will double check diode 101 but I believe it was ok.

[selldoor]

Re: LG W2442PA-BF wont power on.

So just find one with similar dimensions?

Yes and colour. -(sometimes the colour means something (its a minefield))

By the way I dont know where you get parts from (other than Rtech) but if CPC have it, then it free delivery no minimum order only 4- 8 Feb.

[Trune]

Re: LG W2442PA-BF wont power on.

Yeah I saw that today!
But their site is broken and won't let me search resistors! Will check again tomorrow.

Went in a tv repair shop today to try and get one but only had 0.47ohm, he thought it was a 1watt.

[clark422]

Re: LG W2442PA-BF wont power on.

Do you know where i can buy this part?
Inverter Transformer EEL-24W

Thanks