Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Awaiting parts. Will update on the outcome asap.
Badpowersupply
Member
Last Activity: 02-01-2015, 11:57 PM
Joined: 12-15-2014
Location: Sydney
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Hi,
Ve Voltage is OK now.
Think the problem still lies in the psu.
Have taken it out of set and forced the pson and vson.
With no load, the power supply powers up, clicks on and all voltages are correct and stable.
Applying a load to the 15v or 5.3 v lines will cause it to power cycle, attempt to start as it does in the TV. click click click.
It will occasionally power the 21w 12v bulb fine. Also tested with 10w load (2 in series), same result.
Same behaviour as in the TV.
...Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Hi Guys.
The VE Voltage on this TV seems to be generated by the XSUS board (the one on the right) from the VS supply (205V).
The Ve Voltage is reading about 143V. It is supposed to be 105V.
So about 40V too high. This would cause the shutdown cycle right? (overcurrent or protection)
The adjustment pot is on the XSUS board with a big VE next to the potentiometer. It is all the way down, cannot go any lower.
I think this is why is is power cycling, and making...Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Anyone have any ideas which caps to try to replace first?
The Set works about half the time, sometimes takes a few attempts to start. the voltages all seem to be about right when it is running.
Definitely seems to click off more when a brighter picture is displayed. And it seems to be a little better once it has warmed up a little.
Have pulled a few caps and tested with multimeter and seem to be ok, but meter only reads to 100uf so cannot test them all.
Have tried reading up but some say that the...Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Maybe I do have to replace some psu caps?
It started to go off and on.
And now it sometimes is failing to start up, can hear the relay clicking though.
Which still is much more than it was doing before.
Really, the caps in there are too small for such a load? The set is rated at 340 watt.
There is 1 small cap for the vs and a few other tiny ones for the other voltages.
Guess primary caps are just as important too?Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
I wonder if it is worth upgrading the caps in the psu?
Seems to work great, ran it for about 1 hour, but I did notice that after about 10 mins running, it kinda reset, clicked off then back on again.
It is normal for plasmas to make alot of noise from the y and x sustain boards?
Would higher quality caps possibly quieten it down a little?Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Indeed the TV appears to be fixed!
Picture looks great.
A lot of noise though from all the boards in the tv.
Must have been the startup cap and or the dx805.
That goo they had on the board was that important to replace?
Your help here has been amazing and learned much.
Best wishes for the new year everyone! this forum is a great place
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
You wouldn't believe it there now is 5.3v on the standby connector!
I wonder whether to try forcing it on or just try it in the tvLeave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
cm801 is at 15.35v with dx805 in circuitLeave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Thanks rievax
With dx805 removed I believe did measure some pulsing output on the secondary standby line but less than half a volt (according to dmm).
So i guess next step is to replace the dx805 and then calculate the startup cell current before replacing the IC.Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Hey Guys, wow so much info to process, thanks so much!
> How to test the zeners in the vcc startup circuit? 2 of them in series to ground seem to read each about .67v on the diode scale and .43v when tested in series together.
> Resistance from vcc pin to ground is very high about 37k ohm.
> Replaced the startup cap with a 47uf 63v low esr. still the same vcc voltage.
I include a picture with some annotions about the state of the circuit.
Not quite...Last edited by Badpowersupply; 12-20-2014, 04:14 AM.Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Hi rievax, thanks very much for the info, yes i have read the datasheet and am trying to make sense of the circuit.
There is no power on the secondary side at all. With the ac off, the secondary transformer (small one) appears to be shorted on the secondary side (as i specified in pic 1) is this a normal phenomenon?
Additionally there seems to be no path for the power to get from the secondary side back to this IC through the isolation barrier, only optocouplers.
I believe...Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Hi rievax, thanks for that information. It.s interesting you mention about the flat line 14.5v at Vcc pin because when I had the current sense resistor disconnected the voltage at vcc was fluctuating from 12.2 to 14.8v. But with cs resistor back in circuit, the voltage is a stable 14.5v. When I remove the ac power it goes to 15.5v for a couple of mins.
So maybe the problem lies in the circuit which is meant to charge the vcc to 18v?
Unfortunately don't really have any special equipment at this time...Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Just did some further testing.
Where i previously stated 360v it actually is 335v. Sorry about that.
The ICE3BR2565JF has a VCC supply which is at 14.5v. It's datasheet specifies a VCC of between 10.5 - 25v.Leave a comment:
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Re: Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Thanks for the replies!
Hi budm, Yes the line voltage is 230-250v ac.
I have included some pictures of the underside, thanks selldoor.
I'm not quite sure where the b+ standby fusible resistor may be as the standby appears to go through the same transformer as the regular 15v run voltages etc.
I see a fusable resistor in parallel with an ntc and the relay contacts. tests as a closed link (in circuit).
also another fusible resistor across (kinda) bypassing...Leave a comment:
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Samsung SMPS no standby question BN44-00514A (P60SW_CPN)
Hello experts and technicians,
Maybe someone out there can be so kind to offer some expertise, information, advice?
BN44-00514A (P60SW_CPN)
Power supply from 60" Samsung 3D Plasma
The board seems to have full rectified dc voltage (360v) all over the hot side all the way through the presumed power factor correction transformers, fets, diodes, main caps and on to the main vs transformer and it's fets and the the smaller voltages transformer and it's fet ICE3BR2565JF.
But nothing to the cold side whatsover, no standby, nothing.... -
Re: Samsung 60" Plasma BN44-00514A (P60SW_CPN) SMPS dead problem
A picture of the board...Leave a comment:
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Samsung 60" Plasma BN44-00514A (P60SW_CPN) SMPS dead problem
Hey guys,
Maybe someone out there can be so kind to offer some expertise, information, advice?
BN44-00514A (P60SW_CPN)
Power supply from 60" Samsung 3D Plasma
The board seems to have full rectified dc voltage (360v) all over the hot side all the way through the presumed power factor correction transformers, fets, diodes, main caps and on to the main vs transformer and it's fets and the the smaller voltages transformer and it's fet ICE3BR2565JF.
But nothing to the cold side whatsover, no standby, nothing.
Being... -
Re: New Members - please post your introductions here
Hi people, awesome to be a newbie to the forum, very interested in electronics and always trying to learn more. Recently trying to fix a smps from samsung plasma, it's a little tricky to understand some of the processes but maybe some people with some expertise can help
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