Sony 40EX400 Dead No Power....

[gamethriller]

I have a Sony that is dead. Totally dead....

[selldoor]

Re: Sony 40EX400 Dead No Power....

Good - why not tell us what testing you have done - save us asking.

[gamethriller]

Re: Sony 40EX400 Dead No Power....

I would like to try and repair the power supply. They are asking to much everywhere i see it for sale.

[tom66]

Re: Sony 40EX400 Dead No Power....

How have you determined the power board is bad?

[selldoor]

Re: Sony 40EX400 Dead No Power....

Yes - so have you tested anything at all - we dont have time to go through asking if you have tested each component one at a time. Have you read the other threads on the same problem with the same set.

[gamethriller]

Re: Sony 40EX400 Dead No Power....

Yes read the other threads. Im getting 3.3v only. No power indicators. Im not quite sure how to do the jumper. Also im not quite sure how to test on the hot side of the board. Basically using my 450v as reference, haven't made it that far in my online course yet ;-)

[selldoor]

Re: Sony 40EX400 Dead No Power....

1. Test the 3 fuses
2. voltage on BIG cap - care high voltage maybe 400vDC ish.

[gamethriller]

Re: Sony 40EX400 Dead No Power....

1. Test the 3 fuses
2. voltage on BIG cap - care high voltage maybe 400vDC ish.

Fuse locations?

[gamethriller]

Re: Sony 40EX400 Dead No Power....

I downloaded the manual. The other thread that had the same problem the guy just bought boards. They didn't narrow down the problem with the board.

[gamethriller]

Re: Sony 40EX400 Dead No Power....

I dont know what fuses to check. Any direction will be great.

[gamethriller]

Re: Sony 40EX400 Dead No Power....

Anyone :-/ lol

[budm]

Re: Sony 40EX400 Dead No Power....

Fuse PS6401, PS6402 on the power supply board, the main AC fuse is OK otherwise you will not get 3.3V

[gamethriller]

Re: Sony 40EX400 Dead No Power....

Right ok let me check thanks.

[gamethriller]

Re: Sony 40EX400 Dead No Power....

So these black components screwed into the heat sync on the power supply are fuses?

[budm]

Re: Sony 40EX400 Dead No Power....

So these black components screwed into the heat sync on the power supply are fuses?

I have no ideas what you are talking about, did you look at the board?
https://www.badcaps.net/forum/attach...1&d=1416577619

[gamethriller]

Re: Sony 40EX400 Dead No Power....

I miss read the location sorry about that.

[gamethriller]

Re: Sony 40EX400 Dead No Power....

And nothing at either fuse....

[budm]

Re: Sony 40EX400 Dead No Power....

And nothing at either fuse....

What do you mean by nothing? Did you check the resistance of the fuse to see if it is less than 1 Ohms?
Do you know what fuse is and its function? What other tools do you have and do you know how to do SMD repair?

[gamethriller]

Re: Sony 40EX400 Dead No Power....

I dont have any ideal. I know how to use a iron and im trying to learn the rest. I have a shit load of broke tvs from taking them in to learn. I use to run a cell phone repair store. Changing screens and parts on phones. And I can mod consoles.....Im trying to learn I threw the meter on each leg is that wrong. I thought this place was the place to learn. Sorry I don't know as much as I would like to but I am willing to learn. And im willing to stay and pass along what I learn. And I appreciate everything. If I knew how to test the components I wouldn't ask.

[budm]

Re: Sony 40EX400 Dead No Power....

OK, please read the meter user manual first to see how to do resistance test, DC test (you already know that), AC Voltage test.
There is the primary side of the circuit that is connected to the deadly power line which you will have to do the test, for the beginner to be working in that section is not recommend.
Right now the main board is getting the standby Voltage of 3.3Vdc to run the board, if the main board is OK then when the power switch is activated, there should be more than >2.5vdc on the POWER_ON pin, if not, the main board is no sending the signal which then we need to find out why.
You should read this training manual and get some understanding on how your TV function first, look at the Voltages as shown.
Learning to troubleshooting this complex circuits takes years of learning and understanding the basic first is a must.
Safety is my big concern right now.