Element ELEFW502 New power supply and still no stand by light or turn on

[waynewebb77]

Hey everyone I'm new to this. TV went out and i checked the power supply and thought that was the problem so i ordered one and put it in and still no stand by light or signs of life. Here is some pictures of the boards inside and as you can see it was built in March of 2013 cant believe that it already has problems. Any help or guidance is appreciated. Thanks

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Do you have digital meter to check the voltages on those connectors between the power supply board and the main board?

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

i checked the connecters and im getting reading's on them, there's nothing on the board to tell me what they are supposed to be reading, i just traced the lines from the power supply to the connecters and checked it that way, how would i find out what they are supposed to be?

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

One of them should have 5V for the standby voltage which is always present when the TV is plugged in, other voltages on the power supply are turned on when the power supply receives the PS_ON from the main board.

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

ok i will check, the PS ON on the power supply has 5 volts on it i did check that.

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Are there labels next to the connectors to tell you what they are? I doubt that PS_ON control signal will be that high and it will be present only When the power switch is activated, otherwise it will be >1VDC.

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

the 8 wires i have coming from the main connecter on the PSU is as follows

5.25
4.1
5.25
0.0
5.25
5.25
0.0
12.0
does this help any?

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

these are readings on the little green board with the plug in plugged in to a outlet

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

What I am looking for is to find out if you do have standby voltage feeding the main board or not, so far you do have Voltage feeding the main board, so the trouble is in the main board somewhere.
To be sure if the T-CON is not causing the problem is to disconnect the cable between the main and the T-CON to see if you can get any indicator light to come on.
Fixing the main board will be real difficult.

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Ok may sound dumb but is the T-con the one with the multi colored connecter going to it from the main board? if so i just dis connect that and see if i have a stand by light?

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Ok assuming the T-con is the one that has the multicolored wire connecter,its the only other board on there,i un hooked it and re plugged the power back in and still no standby light.

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Yes, it's the one in picture #4.

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

So i'm safe to assume that the main board is bad?

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Yes. There may be some 3-pin voltage regulators that should be checked, you should also inspect the board real well to see if you can see any thing damaged on the board.

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Ok I will check it out and see if I see any damage, what do the voltage regulaters look like and will it be printed on the board what they are supposed to read?

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

https://www.badcaps.net/forum/showth...063#post491063

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

Whoo hoo, I read that link you give me and watched the YouTube videos it had.I tried the compressed air trick after I found one of the voltage regulaters not reading like it should and bam red light came on. It wouldn't go off so I unplugged it and shot more air on it and it came back on , changed sources on the tv then turned it back off. It is one of the 1117 regulaters. Thank you for your help and guidance.after I change this out my kids are gonna love you!

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

OK i got another question, in the pic i have is this an adjustable voltage regulator because the resisters are hooked to the last pin? and will this part # work


http://www.digikey.com/product-detai...SCT-ND/1967218

[budm]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

These are what I use for the fixed and adjustable regulators:
https://www.badcaps.net/forum/showpo...91&postcount=7
BTW, the link you provide did not work for me, also what Voltage do you get on that regulator?

[waynewebb77]

Re: Element ELEFW502 New power supply and still no stand by light or turn on

After I sprayed our with the air it read 5 volts on the first leg 0.9 on middle and 0.8 on the last leg but after I powered the tv off unplugged and plugged back in I get nothing on it until I sprayed it again