Samsung ps51d6900 dk will not switch on

[Miller r5]

Re: Samsung ps51d6900 dk will not switch on

Hi tom

Is this what you wanted tested?

I also removed the buffer board and it's still ok.

Do you have anymore ideas and thanks for all your help.

Cheers
Chris

[tom66]

Re: Samsung ps51d6900 dk will not switch on

It does seem like your Y-main is bad but I am reluctant to suggest replacing it until it is determined whether the panel killed your buffer in the first place.

[Miller r5]

Re: Samsung ps51d6900 dk will not switch on

so is their anything else I can test to confirm it's the y-main at fault?

Can I test the screen in any way?

or is it a case of replace the y-main and see if it works but might not last?

The y-main board is about 25 delivered with a return policy, is it worth the risk?

Cheers for all your help
Chris��

[tom66]

Re: Samsung ps51d6900 dk will not switch on

For a 51" 6-series Samsung I think it's worth the risk, but it's your money. Any cracked panel is a risk. It might work then die or it could be fine or it could blow up immediately...

[Miller r5]

Re: Samsung ps51d6900 dk will not switch on

Cheers for getting back Tom, I have ordered the board and will let you know how it goes.

http://www.ebay.co.uk/itm/190938622901

Cheers
Chris

[Miller r5]

Re: Samsung ps51d6900 dk will not switch on

Hi tom

Unfortunately this has not worked, I have redone your test as before and the results are the same. The only thing I did diferantly was before I powered it up I kept the ribbons disconnected to do the tests first without the screen connected and it was the same as before. I then connected the ribbons and done all the tests again and it gave the same results.

1. VS-ADJ = starts at 207v then drops to under 10v (same as before)
2. VSCAN = holds a solid -187.3v then after about 15 sec drops right off (it did this the last time but quicker)
3. VSC-OUTL TO VSC-OUTH = nothing with the power on or off, volts or ohms.

The only thing I noticed was when checking the VSCAN it would hold the voltage and make a strange hum from the y-main board followed by a few clicks then the voltage drops from -187.1 to under 10.

Do you still think it's the screen if this fault was their before I reconnected the ribbons?

Cheers for your help
Chris

[tom66]

Re: Samsung ps51d6900 dk will not switch on

I'm struggling to explain this fault to be honest.
It's possible you got two dud Y-main boards, but unlikely for them to both have the same failure. Unless this happens when the panel gets cracked. (the board will have been a pull from a cracked panel.)
Do you see any burnt resistors or fuses on the Y-main?

[Miller r5]

Re: Samsung ps51d6900 dk will not switch on

Hi tom

Sorry for the delay in getting back to you.

I have had a look and can't see any burnt resistors!

with regards to the fuses, as in a small standard fuse that you would find in a plug..... I cannot see any on that board just one on the power supply board?

Thanks again for your help.
Chris

[dave247]

Re: Samsung ps51d6900 dk will not switch on

Having read a few threads on this set I will start one covering my problem.