LG Platron W2043T-PF bad MosFets?

[TimmieT]

I've tried to replace all the caps, but the lcd still won't light up

On the bottom of the board on the other side from the mosfets the board looks a bit burnt or browned.

The mosfets are amp4030n
I can't find one to order and was hoping someone smarter could point me to a link on digikey, mouser, or anywhere else.

http://images.ihscontent.net/vipimag...ELS00347-1.pdf

Thanks for the help

[budm]

Re: LG Platron W2043T-PF bad MosFets?

There should be the N-Channel on the board also that you should replace at the same time. Number on the other one?

[TimmieT]

Re: LG Platron W2043T-PF bad MosFets?

sorry but I don't quite understand
Here are some pics I hope the help

[TimmieT]

Re: LG Platron W2043T-PF bad MosFets?

So I put on two new c5707 just because I had them on my desk.
It worked for about 2min now back to the same problem.
I have no clue if the c5707 are even close but I thought it might be worth a try.

[budm]

Re: LG Platron W2043T-PF bad MosFets?

c5707 is just NPN transistor, not the MOSFET.

[TimmieT]

Re: LG Platron W2043T-PF bad MosFets?

Then I guess that the mosfets are the ones with the heatsinks, but the ones that looked burnt were amp4030n which I thought might be close enough to c5707.

I can't find amp4030n anywhere, and I tried to compare the spec sheets but I have no clue how to read it. Thanks again for all the help.

[budm]

Re: LG Platron W2043T-PF bad MosFets?

What is the P/N of the other MOSFET (U302), we already know that one of them is AMP4030N. Transistor and MOSFET do not work the same way. I hope that the IC which drive the MOsfet did not get damaged by using the Transistor in stead of the MOSFET.

[TimmieT]

Re: LG Platron W2043T-PF bad MosFets?

u303 and u302 are both "apm4030n"

the two with the heatsinks are k4100 @ the Q101 spot and "LT9127 SBL1060CT" @ spot D210

[TimmieT]

Re: LG Platron W2043T-PF bad MosFets?

I found these on mouser FDD8447L
[URL="http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/FDD8447L/?qs=sGAEpiMZZMshyDBzk1%2fWizxjlSZEvHaIk31F2L3MhB8%3d[/URL]

they look kinda close I think.
the Continuous Drain Current I can't find though.

[budm]

Re: LG Platron W2043T-PF bad MosFets?

FDD8447L is OK to use. Replace both of them if they are tested bad. The Inverter high voltage transformer output windings should also be checked.

[TimmieT]

Re: LG Platron W2043T-PF bad MosFets?

monitor works great with FDD8447L
Thanks for all the help
by the way does anyone have a cross-reference sheet for common lcd ic's, because that would be super cool.

[budm]

Re: LG Platron W2043T-PF bad MosFets?

Thanks for the repair feedback.