Samsung BN44-00445A failed

[97Kouki]

Re: Samsung BN44-00445A failed

Upon further inspection DP804 looks like the adjacent legs are bridged.

[budm]

Re: Samsung BN44-00445A failed

That one also looks bad to you too, right? I do not know how the rest of the board is like.

[97Kouki]

Re: Samsung BN44-00445A failed

It does but a continuity test between QP804 and each side of it should determine if my eyes are playing tricks, but it looks burnt and separated. Fixable in any case though.

[genius312]

Re: Samsung BN44-00445A failed

I did a connectivity test for almost everything i soldered and it is fine.
Only dp804...the 2 right pins seams to be on the same "network" and so are connected together.
Here are some more pictures.
But both qp are soldered correctly

[budm]

Re: Samsung BN44-00445A failed

https://www.badcaps.net/forum/attach...0&d=1464373831
QP804 is driven by the ICP801 (2A20118B), you you need to find the spec sheet of that IC to get the pin out and then verify that it is getting the VCC between VCC pin and GND pin.

[budm]

Re: Samsung BN44-00445A failed

I found the spec for the IC: 2A20118B

[genius312]

Re: Samsung BN44-00445A failed

I replaced that ic !
Thank you for the spec I'll see what i get

[dick_barton]

Re: Samsung BN44-00445A failed

Looking at the soldering on the board I believe you will have great difficulty completing a successful repair and it may be best to look for a replacement board. The smd devices are not the easiest things to solder and does take practice.

[genius312]

Re: Samsung BN44-00445A failed

The ic is perfect no ? I did replace it.
I know some might look horrible but the contacts are ok !

[genius312]

Re: Samsung BN44-00445A failed

Finally 1 pin has not been soldered correctly and had no contact from the IC !
I resoldered this pin and the T is working
But the front glass cracked when I lift it from the floor so now it is completly broken !!

[Daniel McKenna]

Re: Samsung BN44-00445A failed

I am currently trying to repair one of these power supply pcbs in a Samsung PS59D550C1KXXU.

The set came to me dead with fuse F801S blown and QP802/QP804 shorted.

I have replaced the fuse like for like and the transistors 6R190C6 with 20N60C3.

I now have life in the set but it will not switch on. I can hear a relay click and an ever so slight sizzle from the power supply. My PFC voltage is now 387.8v.

If I disconnect all other boards from the power supply and force it on I get the 15v output but no Vs or Va voltages. Not even for a split second at switch on.

Can anyone help me out? I cannot seem to find a replacement PSU new or second hand.

[dskall]

Re: Samsung BN44-00445A failed

With everything hooked up do you briefly get VS Va when you push power button?

[genius312]

Re: Samsung BN44-00445A failed

With everything hooked up do you briefly get VS Va when you push power button?

In fact, I ordered a repair kit (lot of Surface mount resistance, cap et transitors) rem placed them and it worked !
I resoldered 1 IC that 1 pin wasn't soldered

When I figured that out eveything worked

We can close this thread

[vinceroger69]

Re: Samsung BN44-00445A failed

As the new poster in post 31 has the same power supply we can still help/advise him in this thread genius312 im glad the repair kit fixed your problem but as you say was a pity the screen was cracked in the end.
genius312 do you happen too have a photo of the parts list/locations etc that came with your repair kit as it may help us out with future repairs/advising other thanks.

[Daniel McKenna]

Re: Samsung BN44-00445A failed

With everything hooked up do you briefly get VS Va when you push power button?

Thank you for your reply. Yes and no... With everything connected Vs comes up to 218v and shuts down. Va only comes up to 5v.

The set will power cycle like this 5 or 6 times and then go into standby with the red light blinking twice (fast).

If I disconnect the X-Sus from the Y-Sus board then the power cycling stops but the Vs rises to 218v and back down again immediately.

[genius312]

Re: Samsung BN44-00445A failed

As the new poster in post 31 has the same power supply we can still help/advise him in this thread genius312 im glad the repair kit fixed your problem but as you say was a pity the screen was cracked in the end.
genius312 do you happen too have a photo of the parts list/locations etc that came with your repair kit as it may help us out with future repairs/advising other thanks.

Ho sorry, I thought you wanted to help me again , I never saw the other post :P
I will try to find the pictude I had, but I thought I posted them earlier in this thread.
Someone told me the problem was my solder :P

[genius312]

Re: Samsung BN44-00445A failed

Just in case you might be interested, my repaired power supply board is up for sell.
I removed it from de tv before a trashed it.
In fact, i kept a a bunch of board just in case i find the exact same tv that needs a power supply repair !

[dwillms]

Re: Samsung BN44-00445A failed

Just in case you might be interested, my repaired power supply board is up for sell.
I removed it from de tv before a trashed it.
In fact, i kept a a bunch of board just in case i find the exact same tv that needs a power supply repair !

Hi, I sent you a PM about the board. Need one myself, thanks!

[Maxi625]

Re: Samsung BN44-00445A failed

I have same symptoms, pn59d550. bn44-00445a
everything connected i have Vs 217V for a second, no Va when it cycles on and off 5 or 6 times.
Then the standby light flashes twice, 5 times....

[Danny Electronics]

Re: Samsung BN44-00445A failed

You should know the voltage written on Capacitor shown "maximum working voltage with" NOT the voltage you will get.
To fix a switching power supply, especially plasma TV, you need to know more than basic knowledge, really hard training and practice