Rca 42la45rq

[bleed4me]

So I picked up this TV and it would not power on at all, not even a standby light. Took the back off and went straight to the power supply board. First thing I checked was the fuse and sure enough it was bad. Ordered a new one and put it, the second I tried to fire up the tv it instantly popped again! So I looked into the board itself and what I found has me scratching my head, I have never come across this before. Board number that came out of the tv is RE46DZ2003 and if you go to shopjimmy or any other vendor for that matter this particular board is not listed under this tv model. This board according to all the sites belongs in a RCA 40LA45RQ. So my question is is this common to come across? Does this board even belong in this tv? Did the people i got the tv from try to fix it themselves and put the wrong board in?

[CapLeaker]

Re: Rca 42la45rq

... and maybe show the picture of YOUR board?

[bleed4me]

Re: Rca 42la45rq

Sorry about that. Those stock photos are much clearer than any picture I can pull off with my phone. Hope these will work.

[budm]

Re: Rca 42la45rq

I type in your model number into SJ site and it shows that RE46DZ2302 as the board for your TV.
Oops, ah it is 2003, not 2302, never mind.

[bleed4me]

Re: Rca 42la45rq

Interesting... wonder what I am doing wrong when I search by TV model number I cant seem to find this particular board. If I search by the board number I get Rca 40la45rq as the TV.

[bleed4me]

Re: Rca 42la45rq

budm with your experience with tvs have you ever come across something like this?

[budm]

Re: Rca 42la45rq

If the substitute board has the same output Voltages and current handling capability and the pins of the connector matched up then it will have no problem using it. You will need to look at all the connectors to see if all the pin labels are the same as the correct one is. I did not look at details of the 2003 and the 2302 to see if they are the same or not.
I will have to download both pictures and see.

[bleed4me]

Re: Rca 42la45rq

Thats the thing how would I figure this out? At SJ this TV has like 7 options for power supply boards and none of them have substitute boards and the board that is in there is not on that list. Am I just reading to much into this and this power board goes in this TV or am I on to something here?

[budm]

Re: Rca 42la45rq

At point we just need to find out if all the connector pins matched up between the two models of the power supply boards first.

[budm]

Re: Rca 42la45rq

You can also power up the power supply board by itself without having any other boards connected to it and find out if you do have 5VSTBY or not.

[budm]

Re: Rca 42la45rq

OK, I download both pictures, they are not the same.

[budm]

Re: Rca 42la45rq

http://www.shopjimmy.com/rca-re46dz2...t-inverter.htm

Your LCD panel sticker is this?
Panel Sticker Number: LC420WUE-SCV1
Panel Manufacturer: LG

[bleed4me]

Re: Rca 42la45rq

Here are the stickers on the panel itself...

[budm]

Re: Rca 42la45rq

V420H2-TCL01, it is made by CMO (CHI MEI Optoelectronics) not LG panel.
So with something like this I would contact SJ to see what they will recommend. You should also give them the main board P/N too.
That is for me for tonight, GN.

[bleed4me]

Re: Rca 42la45rq

I can do that...will shoot them an email tonight and report back here tomorrow. Is Panel Sticker Number: LC420WUE-SCV1
Panel Manufacturer: LG suppose to be on this TV and if so how did you come up with that answer?

[budm]

Re: Rca 42la45rq

The panel sticker as shown in the picture is not made by LG. TV manufacturers can use more than one suppliers of the LCD panel to put them in the same TV model.
Just tell SJ the numbers S printed on the panel sticker.

[bleed4me]

Re: Rca 42la45rq

So I got in touch with SJ and explained the situation. I provided them the panel number and main board number like you suggested. This was their response...

As long as the part number on your power supply matches the part number found on our site then it should be the right part. RCA has used so many different set-ups during their TV productions that we have not seen all of them here so sometimes we don't get all the models listed that a particular part will work in. And really the only difference between your TV model and the one listed is the size. I hope that makes sense. The part should work for you!

[bleed4me]

Re: Rca 42la45rq

Now that I got the green light and the mystery hopefully being solved I can now focus on what makes a fuse instantly go bad. I read a thread on a vizio that had the same issue and it stated that a bad bridge rectifier or MOSFETs could be the cause of this. I have tested the rectifier in and out of circuit and when I get home I will post the results and hopefully somebody could help me understand what those readings mean

[CapLeaker]

Re: Rca 42la45rq

pretty easy... if it is shorted, its bad.

[bleed4me]

Re: Rca 42la45rq

Thank you CapLeaker for that thought. You see this is my first time dealing with bridge rectifiers so I'm not sure what a good value would be on the 4 pins.