Lg m228wa

[820uF]

Changed caps but, fuse is fine but still doesn not take power in.
Even the power led doesn't light up.
Transformer?

[budm]

Re: Lg m228wa

Can you please provide good clear pictures of the board and how they are all connected together so we can see what we are dealing with.
What have you tested so far?
I would assumed you have already tested the Main AC fuse, rectifiers, DCV between the two legs of the main filter cap in the primary side, etc.

[victor_cj]

Re: Lg m228wa

You measured the voltage 15V, 5V at CW201 ? Check R108, D202, D201, U303, U304.

[820uF]

Re: Lg m228wa

You measured the voltage 15V, 5V at CW201 ? Check R108, D202, D201, U303, U304.

No power on CW201 at all.

http://imgur.com/HmxfB4s.jpg

Under D102 looks pretty burned.
Is there any scematics for this board around?

[victor_cj]

Re: Lg m228wa

Check for cracked soldering, replace all caps C106, C105, C201, C202, C203, C204. Check ZD103, D102, D101. Replace in the last case U101, Q101.

[820uF]

Re: Lg m228wa

D102, D101 ok but R108 - From color code orange;orange;silver;gold it's Resistance Value:
0.33 ohms, +/-5%, but multimeter shows 0.7ohms. could that be the problem?

[budm]

Re: Lg m228wa

D102, D101 ok but R108 - From color code orange;orange;silver;gold it's Resistance Value:
0.33 ohms, +/-5%, but multimeter shows 0.7ohms. could that be the problem?

No, that is not the problem, you are reading the meter probes resistance + the value of the resistor.

[victor_cj]

Re: Lg m228wa

D102, D101 ok but R108 - From color code orange;orange;silver;gold it's Resistance Value:
0.33 ohms, +/-5%, but multimeter shows 0.7ohms. could that be the problem?

Put the multimeter probes in short to see their resistance value. Anyway check again.

[820uF]

Re: Lg m228wa

Thak you all for help.

U101 was bad.