Hi, my SAMSUNG UE40D5000 tv doesn' t work anymore. The red led light indicating that the tv is plugged is not powered when I plug in the tv. The original power board modem is BN44-00473B. I have checked the voltage on the connector to the mother board of the tv, and it was 0 instead of 5.3V or 13V on the different pins, with the fuse still working and no obvious overheated part on the power board and no bulging capacitor seen neither.
I have then changed the power board with a used one bought on ebay, which model BN44-00473A is said to be compatible. It has then worked perfectly 2 days until yesterday. This morning I had to move a little bit the tv, what I did very gently, and got really disappointed as I plugged it and didn't see the red led light on anymore.
Since this morning, the power board seems to be broken once more ( I have moved from my original flat 1 week ago and don't have a multimeter to check once more that the fuse is ok and what are the voltage on the connector to the mother board )
I am wondering if this new power board failure is just bad luck, 2 days after receiving this other power board circuit ( that is a used unit, not brand new) or if the mother board could have damaged it. In the first case I would send the power board back to the seller, otherwise I will probably give up as I don't have time and skills to repair the tv.
My question is : do you think the mother board or another unit connected to it, can damage the power board ?
Thanks for your help and answers !
2024, May 4 - 16:13
#1
cedb92
Hello!
D-series mainboards all have problems, this is worst Samsung tv's in the world. 90% NAND problem you can buy in e-bay programmed NAND for $20 and tv works for 1year..
1
Hello !
The tv worked alright for about 10 years before breakdown, that was not that bad, but there is a lot of people having breakdowns though. Checking once more the original power board, it seems the area around one MDF11N60 transistor has been overheated, I'll try to change the transistor and see if it gets repaired.
Do you think the mother board or the led pannel circuit connected to the power board can the the source of the power board breakdown ?
Are you talking about the main board or the power board ?
0
Hello!
MDF11N60 browned area is normal. Main board have a problem.(My statistic: I changed 6-7pcs mainboard and 0pcs power board and about 10pcs mainboard failure but owner not want to repair)
0
Hi.
This is a spontaneous failure.
The motherboard has nothing to do with the power supply failure
1
Hi,
That was also my guess, but the failure happened just 2 days after power board failure, thus I had a doubt.
Does someone have the circuit diagram of BN44-00473B ?
I see everywhere the circuit diagram joined to this message but I don't find this diagram matches my board setup. On my board, labeled BN44-00473B, there's a 14 pin connector labeled CNM803 towards the main board and another 6 pin connector towards the led or lcd pannel.
On the joined pdf file found everywhere on internet that is supposed to be BN44-00473B, they mention a 30 pin connector .
Thanks !
0