phillips lcd keeps blowing fuse

[TimT]

Re: phillips lcd keeps blowing fuse

I may pull these tonight or in the morning! Thank you!!

[Mark369]

Re: phillips lcd keeps blowing fuse

so becasue SA1601 is on the same line as R1609 you cant test it onboard.
is this right?

[Dgtech]

Re: phillips lcd keeps blowing fuse

Better yet, I'll go as far as to just say, CHANGE SA1601 and SA1602. If you just pull these parts out I'll bet you that one of them is shorted.

This item is listed on the parts sheet as:

SA1601# SURGE ABSORBER 470V+-10PER



.

[selldoor]

Re: phillips lcd keeps blowing fuse

I gave up on it because the pictures are so bad they hurt my eyes- chance of spotting anything is almost zero and there are none of the backs

[Dgtech]

Re: phillips lcd keeps blowing fuse

Here, I did you a little legwork. Pull the first transformer (L1501) out of the circuit and see if your short is still there by checking ohms across from fuse (both sides) to ground. Here is a schematic of this primary side of your power supply.

[Dgtech]

Re: phillips lcd keeps blowing fuse

I just read over this thread from start to end and all that you've tested so far was the diodes. Has anyone found a schematic on this set??? Is there a possible shorted FET? I'm sure theres a way to find the faulty component that's blowing this fuse? These problems are usually the easiest to find and cheapest to fix.

[TimT]

Re: phillips lcd keeps blowing fuse

I just replace the rest still blowing a fuse. I will buy a new power board! this has been a learning experence and I want to thank everyone for helping!

[tom66]

Re: phillips lcd keeps blowing fuse

It would be a good idea, also be very careful to get them in the same way they came out.

[TimT]

Re: phillips lcd keeps blowing fuse

I just replaced the two.. but I can go ahead and replace the other 2 also

[tom66]

Re: phillips lcd keeps blowing fuse

Did you replace all four diodes?

[TimT]

Re: phillips lcd keeps blowing fuse

after installing the new diodes. it's still blowing fuses any suggestions on what I should try next?

[Mark369]

Re: phillips lcd keeps blowing fuse

Thanks i hope you let us know

[TimT]

Re: phillips lcd keeps blowing fuse

thanks everyone I'm just about to order the parts :-). I will report back when I get them installed

[Mark369]

Re: phillips lcd keeps blowing fuse

I found the link of the manual and the part number for you is on page 74.
http://www.scribd.com/doc/80791100/40PFL3705D-F7
have a good one.

[Mark369]

Re: phillips lcd keeps blowing fuse

here are the drawings for that board just check the number on the top corner of the board if it is BA01P0F0103 3. the same board that i have in my
emerson lc401em2f.

I have the full pdf ver. just to big to upload on here. that power suply look the same as the one im working on.

[Mr Bill]

Re: phillips lcd keeps blowing fuse

That I is probably a 1 (1N5406)
http://www.digikey.com/product-detai...TPCT-ND/950583

[TimT]

Re: phillips lcd keeps blowing fuse

Thanks! I was looking for a chip with 4 pins " rectifier ".. none on the power board.. I will order the new diodes and go from there! how do i find the correct diodes? there marked LT 0342 IN5406 But this turns up nothing is a search..

[tom66]

Re: phillips lcd keeps blowing fuse

Those diodes are the bridge rectifier. It's marginally cheaper but less reliable to do it as four diodes.

[Mr Bill]

Re: phillips lcd keeps blowing fuse

Here is a youtube video on testing the bridge. Your meter will need to be on the diode mode.

http://www.youtube.com/watch?v=dqkT6hF0O3E

[TimT]

Re: phillips lcd keeps blowing fuse

ok, after testing many small diodes ( they all were good) i took a break and started testing some larger ones. 2 of the larger ones are " beeping " on both ends reading on meter is 0..pulled them off the board same thing.. the rest were ok. so I will order these.

I would like to test the bridge rectifiers. do i test these the same way? ignoring the middle pin? i guess there attached to the heat sink?