Dead As A Doornail. Sony KDL-40EX400

[t4796]

Re: Dead As A Doornail. Sony KDL-40EX400

thanks for your post tibimakai,

i'll study your threads on the subject. i don't seem to be getting the 12 or 24volts out when i run the power supply in isolation with the power on jumpered to standby voltage. were you able to jumper and get 12/24v from the power supply disconnected from the rest of the boards?

i want to try to rule out the power supply before i move to the mainboard. tonight i will measure to see if the 'mode' pin of IC6301 gets grounded when jumpered on, and if the voltage on the main capacitor ramps up at this time as suggested in some other threads.

i saw another post where somebody mentioned a diode in the power supply that was bad and caused the IC6301 PFC not to work correctly.

[tibimakai]

Re: Dead As A Doornail. Sony KDL-40EX400

I have fought, with two 46EX400 in the past, with two blinking codes and both time were bad mainboards.
On the second one, the third board(!) fixed it.

[t4796]

Re: Dead As A Doornail. Sony KDL-40EX400

i'll start a new thread. sorry for jumping in. i saw a few other threads where people do that and realised it is rude.

[t4796]

Re: Dead As A Doornail. Sony KDL-40EX400

can i join this party? i have a kdl-32EX400 which is very similar power supply. it is g2le, and doesn't have any of the 'non' components present.
it does the two red light flashes

i've just got the power supply itself on the bench. i jumpered standby 3.3v to power on. i didn't use a resistor.

i haven't measured all the caps, but i have measured two:

------standby | jumpered to pwr_on
C6117 - 7.75v | 13.45v
C6118 - 8.00v | 13.89v

when i cut the mains, the standby voltage slowly rises to about 9v. why is that?

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

Awesome! That's the kind of reassurances I need!

Thanx.. I'll let you know how it goes in a couple hours..

[tom66]

Re: Dead As A Doornail. Sony KDL-40EX400

It's damn near impossible for a main board to kill a power board. Especially on the PFC side of all things... So I would not worry myself.

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

OK, going to play around with this pair today..

I got a new (assume to be working) power board for these SONYs... I also ordered a new A Board as well.. What the hell, you can never have too many parts, right??

Because there is some concern I have that my current A boards might be damaging the Power board, I am wondering if I should plug in the new Power board and see what happens??

Or should I wait til the new A board comes and install them as a set??

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

Had to put these on the back burner for the weekend. Hope to jump on them again Monday..

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

I'll give that a shot. Thanx Tom

[tom66]

Re: Dead As A Doornail. Sony KDL-40EX400

Try unplugging the T-con board from the main board?
Really, really odd.

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

Can you try swapping power & main from EX500 into EX400? (It could be power surge that has damaged the boards.)

Interesting you should mention this...

First off, I did put the 500 boards in the 400.. Still dead..

But the funny thing is, when I try a 400 board (either MAIN or POWER) in the 500, it's dead... But when I put the 500 boards back into the 500, it doesn't work right away.. I have to let it sit unplugged for a few mins and THEN the boards will work.. That is to say, it "works" as in giving me the 6 RED LED blinks, etc etc etc

Almost as if something on the 400 boards is shorted and causing the 500 to have to "reset" it self.

You can see why my mind is a bit frazzled...

[tom66]

Re: Dead As A Doornail. Sony KDL-40EX400

Can you try swapping power & main from EX500 into EX400? (It could be power surge that has damaged the boards.)

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

OK, let's add a little fun twist to the saga...

I just got in another Sony. KDL-40EX500

The only different I can tell between the two is the extra connector going to the T-CON Board. (Pictured)

Now, let me see if I can explain it...

The NEW acquisition (EX500) when it's plugged in, the power LED blinks red 6 times.. When I power it up, the red LED goes out, the green LED comes on. I see the SONY emblem on the screen for a sec or two, here the SONY tone. That happens 3 times. Then the green LED goes out and the RED LED starts blinking 6 times again...

Now, I figure I can kill two birds with one stone or, in this case, fix two TVs with the parts...

Of course, it's nice in theory...

When I put in the Power PCB from the EX400 into the EX500, I get nothing. No power lights no green lights no nothing...

When I put in the Main Board PCB from the EX400 into the EX500, I ALSO get nothing. No power lights, no green lights no nothing...

And the converse is also true.. When I put the Main Board PCB and the Power PCB into the EX400 from the EX500, I get nothing..

I hope I explained that clearly because, in my mind, it's a MAJOR jumble, a total SNAFU...

As Tom Cruise said in A FEW GOOD MEN...."I don't know what all that means, but it sounds pretty bad.."

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

Found a 4.7uf 50v Capacitor.. Replaced it on the Sony..

No Go.... Knew it couldn't be THAT simple...

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

Also, what's the p/n of that 7pin chip near C6115. I think it's ok as you've got stby but I just want to check 0V on that cap is normal (could be the burst/fault timer, if so its ok. Looks like the pfc/multi ic has the right supply so thinking that its probably bad.

I was thinking just replacing C6115 as a matter of course..

It's a 4.7uf 50v

Any leeway for testing purposes??

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

I got the unit packed up for transport to the shop..

I'll be jumping on it in about 3-4 hours...

Thanx for all the help from everyone..

[tom66]

Re: Dead As A Doornail. Sony KDL-40EX400

Also, what's the p/n of that 7pin chip near C6115. I think it's ok as you've got stby but I just want to check 0V on that cap is normal (could be the burst/fault timer, if so its ok. Looks like the pfc/multi ic has the right supply so thinking that its probably bad.

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

Usually, I find I can gently bend over the capacitor to probe the leads. (Only do this with power off -- the top of the cap is often live!)

Yea, I thought they were flush with the PCB.. They aren't..

OK

C6115 0v
C6117 14.29v
C6118 14.53v
C6323 14.28v

I'll try that trick with the IC as soon as I can dig up some chalk..

[tom66]

Re: Dead As A Doornail. Sony KDL-40EX400

Usually, I find I can gently bend over the capacitor to probe the leads. (Only do this with power off -- the top of the cap is often live!)

[Michale32086]

Re: Dead As A Doornail. Sony KDL-40EX400

C6115 is dead... .000v

I am going to have to get under the board to check the rest.. It will take me a few...