Samsung LE32C450E1W don't start

[claudegu]

Re: Samsung LE32C450E1W don't start

Martino, yes I have an electronic hobby store, I will go there.
Tom66, have you an other idea to help me?

[tom66]

Re: Samsung LE32C450E1W don't start

Can you confirm if my assumption that you are using an ammeter in series with the power board outputs is correct?

[martino]

Re: Samsung LE32C450E1W don't start

I'm gonna step back on this one, multiple advise inputs can be very confusing to the readers side, tom66 is by far superior in knowledge and experience over me so I would take his word over mine !!
I will be sitting back and lurk here to learn the outcome of this TV, very interesting !!

[claudegu]

Re: Samsung LE32C450E1W don't start

Tomm66 : yes, it is what I have done. But I wonder if it was the good procedure, may be I have to put "dummy" loads like car light bulbs to really knows what happend?
Martino: I really appreciate any help and as you may notice, I'm allready a bit confused

In fact I should have read all posts about this kind of failure before posting. I learn a lot these last days and I'm happy about that.

[RenaultZero]

Re: Samsung LE32C450E1W don't start

If I changed the capacitor will it then work?

[claudegu]

Re: Samsung LE32C450E1W don't start

Please, open a new thread, otherwise, it will be difficult to know which answer is for which question.

[RenaultZero]

Re: Samsung LE32C450E1W don't start

Why should I open a new thread? I have the same Samsung TV with the same problems as you? Just searching for solutions...

[tom66]

Re: Samsung LE32C450E1W don't start

If original poster comes back, then we get confused. Plus, it is good courtesy not to take over someone else's thread.

[claudegu]

Re: Samsung LE32C450E1W don't start

I'm still here
Just not enough time for the test with dummy load, will do it tomorrow !

[claudegu]

Re: Samsung LE32C450E1W don't start

Here a the results:


With backlight on (supply board not plugged to main board), I think the 24V is OK
When I put a 21W 12V lightbulb on the 13V output, the 12.3V fall to 11.6V. is it OK ?
About the 5 V, I have no load to test it, how may I do this?

[claudegu]

Re: Samsung LE32C450E1W don't start

I have put also a 21W 12V as dummy load for the 5V, the Amp is about 1A and the 5.26V fall to 4.86V

With the 2 loads, one on 13V, the other on 5V, same results, the supply board seems to be OK.

As soon is have the main board plugged to the supply board and I 'turn on', the 12V and 5V go down and up and down every 3 or 4 seconds.

If someone has an idea...I will be very happy!

[Alastair E]

Re: Samsung LE32C450E1W don't start

Have you tried Two 12V lamps in series--and tried the 24V output from the PSU?

The 5V and 12V from PSU sound to be OK to me....

[claudegu]

Re: Samsung LE32C450E1W don't start

Thanks for the reply.
As the backlight light on, I think the 24V is OK.

It seems that my problem is on the main board, but wich methodology to find a failure on a such board?

[claudegu]

Re: Samsung LE32C450E1W don't start

Any idea ?

[claudegu]

Re: Samsung LE32C450E1W don't start

Still no idea????

[claudegu]

Re: Samsung LE32C450E1W don't start

[tom66]

Re: Samsung LE32C450E1W don't start

Alastair's question is relevant, many backlights have a wide operating range - a low 24V might not affect them as much as the main board is affected by 13V or 5V being low.

[claudegu]

Re: Samsung LE32C450E1W don't start

I have at home 2 power supplies a 13.2V and a 5V, if I use it to supply the main board, could it works?
I will keep the PSU only for the 24V.

So it is works like this it would means that the PSU is not working properly.

[tom66]

Re: Samsung LE32C450E1W don't start

Yes that would be fine, but you must make sure the 13V turns on when the main board wants it. it might not work if it turns on beforehand.

[Cap-tivated]

Re: Samsung LE32C450E1W don't start

I'll dredge up this old thread as it was the reason I found this forum.
I'm wanting to repair multiple Samsung LA32C400 TVs. (Shares the same PSU as LE32C450)
Most have the same fault as described by the OP.
I have not tested the actual psu boards but doning one from a fully working set does do the trick.
PSU board is again the BN440033A version (not B).

Soooooooo,
Q1) Is it safe to assume that the same brown poly cap as shown by martino is the one to attack on each of these faulty sets?

Q2) Another set comes on fine but once warmed for a minute or so has horizontal "interference" lines along the top third of the screen. What should I be looking at to fault find this?

Many thanks.