Rca RLED4010A power supply

[whitesnake]

Hello!My mom just gave me her Del TV because it had an intermittent no power issue.

So i'm looking to fix this unit since i got it for free.The problem is that i search the net for hours looking for a replacement power supply and there is only the rev1.1 version.On my board is written: MEGMEET MP118T REV1.2 2011.06.02

Is it ok if i used a rev 1.1?

Thanks!

[newtothis]

Re: Rca RLED4010A power supply

Not want to repair the board?

[whitesnake]

Re: Rca RLED4010A power supply

I wish i could repair the board but my mom's friend tried
to replace the transformator(the black square thing between hot and cold).Now the tv is dead,even the standby light dosen't light anymore.And i'm à beguinner
So i dunno how to troubleshoot a board.

[newtothis]

Re: Rca RLED4010A power supply

We can help, Start by getting good clear pictures of the PSU, top and bottom.. get a good one of the area that has been worked on before.

Have a Multimeter?

[whitesnake]

Re: Rca RLED4010A power supply

Thanks for your help,i appreciate it!I will take clear picture tonite when i get home.I do have
Basic tools,like multimeter,electronic solder gun.

[whitesnake]

Re: Rca RLED4010A power supply

I took a few shot of the board,thanks for your help!

[whitesnake]

Re: Rca RLED4010A power supply

Update!

I took a closer look at the weldings(picture 6 top right)and there was a little overlaping of lead so i scraped it off with a small screwdriver.When i put the power back on the red stand by light was on

When i put the tv on the light turns blue,but nothing happens.There is a high pitch sound comming from the black transfo...at least the Tv is not dead anymore!! So if this part is not in cause maybe with the help of you guys we can save this board!

It seem back to the state it was before that repair was tried.The set would not come on sometimes,and the only way to turn the tv off is to unplug it.After several attempts,the Tv would turn on and work fine.

[newtothis]

Re: Rca RLED4010A power supply

OK, can you get me a close up of the connector that goes from the PSU to the Main board (one with the HDMI etc on) so i can see any references for voltages.

ta

[whitesnake]

Re: Rca RLED4010A power supply

Here it is

[whitesnake]

Re: Rca RLED4010A power supply

any help with this would be appreciated!!

[whitesnake]

Re: Rca RLED4010A power supply

i'm still triing to figure this out so i could have a chance to fix this set for the holidays..any toughts?

[whitesnake]

Re: Rca RLED4010A power supply

i went to the local electronics any the clerk took a look at my psu and said it look fine and probably it is the inverter board that need to be changed.How do i check this board?

[philliesfan30m]

Re: Rca RLED4010A power supply

how did he come up with that? the connector that goes from the power board to the main board what are the pins labeled? gnd gnd 5vstb etc. list them in order or take a close up of those labels

[philliesfan30m]

Re: Rca RLED4010A power supply

can you take a clear pic of the area of the transformer that is making the noise so we can see the components around it? i am gonna guess it isn't the transformer but a diode close to it...just a guess for now

[philliesfan30m]

Re: Rca RLED4010A power supply

if t2 is the transformer that was worked on check d8 and d17 and see what the reading are...1 of them might be what is making the sound

[whitesnake]

Re: Rca RLED4010A power supply

hello and thanks for your help!The transformer was indeed the T2,so i check the D8 and D17 and the reading was Infinite on one direction and about 600 in the other so i guess they are fine.For the picture,i'm sorry for the poor quality.I will borrow a good quality camera and send some pics asap.

[budm]

Re: Rca RLED4010A power supply

Can I see the whole back side of the TV to see how the BACKLIGHTS LED strings are connected to that power supply board?
That black transformer is for the LED backlights power supply. There should some kiond of printing on the board to indicate the output voltages of the power supply.

[whitesnake]

Re: Rca RLED4010A power supply

I took a few clearer shot of the values asked.If you need any precisions,just ask me i will take more shots

[whitesnake]

Re: Rca RLED4010A power supply

up

[budm]

Re: Rca RLED4010A power supply

OK, there is LED backlights driver board just above the power supply board and it gets the 24vdc from the power supply board.
Those 3 output connectors of the power supply boards have labels on them, such as 12v, stby.
Make the list of all the label on those connectors.
Then take the DC voltage readings, black probe on the chassis.
Report the readings when TV is plugged in (do not activate the power switch).
Then hit the power switch and take the reading and report the readings.
They are important information for us to know.
Do not touch anything on the board with your hand, you should also plug the TV into GFI outlet to protect yourself.