Emerson LC401EM2F

[budm]

Re: Emerson LC401EM2F

I bought that panel (the switch is in series with the socket), got from HD long time ago.

[Mark369]

Re: Emerson LC401EM2F

OK, we need to start isolate the circuits to find out which section is shorted out, let try removing the Q601 (2SK3798) on page 3. You should use the lamp (100~200w) in place of the fuse so you will not keep blowing fuses and cause more damages.

Ok removed Q601 and put every thing back put light across fuse.
the light was at what i would say 100% bright.

[budm]

Re: Emerson LC401EM2F

OK, the lamp stays bright so you still have shorted circuits.
We still have 3 more MOSFET's we need to remove.
Lets take out Q1701, Q1702 on page 2 of the diagram for the 24V power supply and see if the lamp will stay on bright.
If it does, then remove Q1602 for the PFC circuits.

[Mark369]

Re: Emerson LC401EM2F

Ok all three out and still no change on lamp. Aslong as I hooked it up right. I just took old lamp and cut plug off one end of wire to the fuse holder

[budm]

Re: Emerson LC401EM2F

Are you sure your rectifier bridge is OK.

[Mark369]

Re: Emerson LC401EM2F

D1607 to d1610 one reading I think they were like 660 I did not pull to meas

[Mark369]

Re: Emerson LC401EM2F

What about Q1601

[budm]

Re: Emerson LC401EM2F

Ah, I missed that one on page1

[Mark369]

Re: Emerson LC401EM2F

Still the same thinking of taking L1602 out

[budm]

Re: Emerson LC401EM2F

"I just took old lamp and cut plug off one end of wire to the fuse holder" I just re-read yor post.
OK, so you will have TWO wires that go to the lamp. One end of the wire will go to one of the fuse holder clip, another end of the wire will go to the other fuse holder clip.
We are using the lamp in place of the fuse.
Pictures of the setup?

[Mark369]

Re: Emerson LC401EM2F

Yes

[budm]

Re: Emerson LC401EM2F

If that is the case, there are two set of bridge rectifiers,
D1607~1610
D1201~D1204.
Just lift one leg of each Diode.
Those are fed by the L1602.

[Mark369]

Re: Emerson LC401EM2F

Yes

[budm]

Re: Emerson LC401EM2F

So what happen?

[Mark369]

Re: Emerson LC401EM2F

oh haven't tryed it yet. sorry was posting from my cell phone. must have posted twice.

I have lifted a lag of D1201-D1204 and they tested good reading only one way on diode mode. I tested these because they tested bad onboard. D1607-D1610 Test good onboard.

[budm]

Re: Emerson LC401EM2F

We want to lifting component till the lamp does not stay on full bright any more. With most of the components we removed so far. there is not much else that will draw so much current to make the lamp to be lit up.

[Mark369]

Re: Emerson LC401EM2F

Yes

Sorry dam phone.

[Mark369]

Re: Emerson LC401EM2F

D1201 to D1204 turned light off
but as far as I can tell they test good

[Mark369]

Re: Emerson LC401EM2F

I did removed ic1201 before I removed D1201 to D1204

[Mark369]

Re: Emerson LC401EM2F

So I there must be a dead short in the area of the 1200 series parts.
Could some one tell me if my thinking is right.