Samsung PS-42P4H Plasma Turns on and off clicking

[zackofall]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Sorry guys I might be bothering you. I have the same TV purchased in Australia, using now in mumbai India. I am also having problems with my power supply. Once there was a power surge in our area and the TV went "Bhoooph". The fuse of my switch board also got burnt. I change the fuse and put the TV on. All my other appliances are working except for the this TV. Its gone in standby mode (Red light blinking) and would not turn on, no matter what ever mode I use. Direct button from the TV nor the remote. It just doesn't start. Can any one help me to solve this problem.
Thanks
NAZIM

[PlainBill]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

yes, not much info out there on it.

I did find some info today that there might be an updated part number of BN96-00923A. Haven't found much info on that one either.

The price of the power supply is why I was trying to find a way to repair it rather then buy a new board.

I would prefer to fix the board, but if I have to buy the board it won't be too bad. I am only into this TV for a $100. So I won't considered it too bad of deal if I end up getting a working TV for around $250-$300

Prices on TVs here in Australia are quite a bit higher, then in the states.
Once repaired I could probably get $600 out of it as I have seen similar plasmas go for that on Ebay.

Would it be worth it to just start replacing caps on the board?
I don't have an ESR meter but I do have a capacitance on my Fluke, so I could start pulling them off and checking them for that.
Kind of considering buying an ESR for this and future projects.

Not sure were I should go next.

Thanks for the Help.
Jason

Sorry, you're talking to the wrong guy here. I've only encountered power supply problems twice. The first one I spent the better part of a week troubleshooting. I found that all capacitors were good, none of the semiconductors were shorted, and only the 3.4 volt supply even started to come up. I wound up buying a replacement. The second was actually a failure of the DC-DC converter on one of the other boards.

I do seem to remember I have information on troubleshooting plasma power supplies, however. I'll see if I can locate the source and will post the link.

PlainBill

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

yes, not much info out there on it.

I did find some info today that there might be an updated part number of BN96-00923A. Haven't found much info on that one either.

The price of the power supply is why I was trying to find a way to repair it rather then buy a new board.

I would prefer to fix the board, but if I have to buy the board it won't be too bad. I am only into this TV for a $100. So I won't considered it too bad of deal if I end up getting a working TV for around $250-$300

Prices on TVs here in Australia are quite a bit higher, then in the states.
Once repaired I could probably get $600 out of it as I have seen similar plasmas go for that on Ebay.

Would it be worth it to just start replacing caps on the board?
I don't have an ESR meter but I do have a capacitance on my Fluke, so I could start pulling them off and checking them for that.
Kind of considering buying an ESR for this and future projects.

Not sure were I should go next.

Thanks for the Help.
Jason

[PlainBill]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

The power supply parts numbers
are Sanken p/n BN96-01047A
or PSC10071J M

This TV might be an Asian version as its in Australia

OK, that explains the other thread. The power supply is available at prices ranging from $129 to $280 (US$), plus shipping. Frankly, this is an old beast. Wizard may have a contrary opinion, but I wouldn't recommend investing the money.

Whoops!!! Searching that part number and schematic got exactly one hit - on Scribd.

PlainBill

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

The power supply parts numbers
are Sanken p/n BN96-01047A
or PSC10071J M

This TV might be an Asian version as its in Australia

[PlainBill]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Also I found the service manual on http://elektrotanya.com
Here is a link to it on my google docs.

http://docs.google.com/fileview?id=0...uthkey=CPWp9Ho

Didn't see a schematic in there for the main power supply board though

You've got the manual for the Asian version. It's got a different power supply. There should be a couple of part numbers on the power supply. Look for something starting with LJ.

PlainBill

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Also I found the service manual on http://elektrotanya.com
Here is a link to it on my google docs.

http://docs.google.com/fileview?id=0...uthkey=CPWp9Ho

Didn't see a schematic in there for the main power supply board though

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Thanks PlainBill

Now that we have narrowed it down to the power supply, How do I go about troubleshooting it?

Thanks again

[PlainBill]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Sorry trying hard to give you the info you need. I really appreciate your help.

Thanks for the reminder about the voltages, I have been tearing apart electronics since I was pretty young, and have grabbed the wrong thing a time or two and got bitten. So I am really careful now. : )

The second to the bottom pin on the 9 Pin connector (CN804) is labeled Vg.
Pressing power button does not make difference on any test
Step 2. = 15V
Step 5. X Drivers unplugged = 15V
Step 8. Z Sustain unplugged = 15V
Step 11. Y Sustain unplugged = 15V

The Top Two pins on the 9 Pin connector (CN804) are labeled VS
Tested both pins and they were the same on all tests.
Pressing power button does not make difference on any test.
Step 2. = 2.8V
Step 5. X Drivers unplugged = 2.8V
Step 8. Z Sustain unplugged = 1.7V
Step 11. Y Sustain unplugged = .7v

The second to Last pin on the right Z Driver connector (CN812) is VA
It was 0v on all tests.

I have included better pictures of the CN804,CN805,CN806,CN812 connectors
CN805 Left 10 pin Y Sustain
CN804 Right 9 Pin X Sustain
CN 806 Left X Driver
CN812 Right X Driver

You can also find more images in my picasa album at higher res.
http://picasaweb.google.com/Digital....eat=directlink

Thanks for your help Hope I gave you what you needed to know

Well, that's pretty clear information. If any of the voltages mentioned on the white label on the upper right corner of the panel do not appear, you are dealing with a bad power supply.

PlainBill

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Sorry trying hard to give you the info you need. I really appreciate your help.

Thanks for the reminder about the voltages, I have been tearing apart electronics since I was pretty young, and have grabbed the wrong thing a time or two and got bitten. So I am really careful now. : )

The second to the bottom pin on the 9 Pin connector (CN804) is labeled Vg.
Pressing power button does not make difference on any test
Step 2. = 15V
Step 5. X Drivers unplugged = 15V
Step 8. Z Sustain unplugged = 15V
Step 11. Y Sustain unplugged = 15V

The Top Two pins on the 9 Pin connector (CN804) are labeled VS
Tested both pins and they were the same on all tests.
Pressing power button does not make difference on any test.
Step 2. = 2.8V
Step 5. X Drivers unplugged = 2.8V
Step 8. Z Sustain unplugged = 1.7V
Step 11. Y Sustain unplugged = .7v

The second to Last pin on the right Z Driver connector (CN812) is VA
It was 0v on all tests.

I have included better pictures of the CN804,CN805,CN806,CN812 connectors
CN805 Left 10 pin Y Sustain
CN804 Right 9 Pin X Sustain
CN 806 Left X Driver
CN812 Right X Driver

You can also find more images in my picasa album at higher res.
http://picasaweb.google.com/Digital....eat=directlink

Thanks for your help Hope I gave you what you needed to know

[PlainBill]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

I'll be honest with you, I don't get the warm, fuzzy feeling that you and I are communicating adequately. I DO get the feeling that you are trying to give me the information I need. (This is a welcome contrast to others who always seemed to want to go off on a tangent and discuss everything EXCEPT answering my question.)

On the left side of the main power supply are two connectors, a ten pin (Y-Sustain), and just to the right of it, a nine pin (Z-sustain). There are also two 5 pin connectors directly below these two connectors (top and bottom X drivers). The next-to-the-bottom pin on the 9 pin connector is labeled Va or Vs, I can't quite figure out which.

I may have mentioned this already, but it bears repeating. There are potentially lethal voltages present on this power supply. These can present a life-changing (or life-ending) experience. Always keep at least one hand in your pocket when working on the power supply and wait 2 minutes after unplugging the power cord before touching the power supply.

Step 1. With the power cord unplugged, improvise an adapter so you can hook the + (red) probe of your DMM to the Vs (Va?) pin. I use a dissecting pick jammed into the connector; some connectors have enough room you can stick the meter probe in far enough to make contact. The - (black) probe should be hooked to ground. I usually just stick it into one of the unused mounting studs on the plasma panel. Set the DMM to the 200 VDC range.

Step 2. Plug in the power cord and turn on the TV. Does the DMM show any change in voltage? How high does it go?

Step 3. Once the relay clicks again, unplug the power cord, wait at least two minutes.

Step 4. Disconnect the two 5 pin (X drivers) cables.

Step 5. Plug in the power cord and turn on the TV. Does the DMM show any change in voltage? How high does it go?

Step 6. Once the relay clicks again, unplug the power cord, wait at least two minutes.

Step 7. Disconnect the 9 pin (Z-Sustain) cable at the Z-Sustain card.

Step 8. Plug in the power cord and turn on the TV. Does the DMM show any change in voltage? How high does it go?

Step 9. Once the relay clicks again, unplug the power cord, wait at least two minutes.

Step 10. Disconnect the ten pin Y-Sustain cable at the Y-Sustain card.

Step 11. Plug in the power cord and turn on the TV. Does the DMM show any change in voltage? How high does it go?

Step 12. Once the relay clicks again, unplug the power cord, wait at least two minutes.

Step 13. If the power supply came up to full voltage and the relay did not click the second time the module you have just disconnected is at fault. If the power supply never came up to full voltage, the power supply is at fault.

PlainBill

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

My Label Says (see attached pic)
VA Vsc VS Ve Vset
70 -60 170 160 157

I measured all votages on all of my power supply connectors on both the main
Power Board and the little one to the left.

Sorry for the long post.
Voltages

Main Power Board
CN805 (Left)
VS 2.4
VS 2.1
RTN
RTN
VSet 0
RTN
VScan 0
RTN
Vg 15
D5v 5.3

CN804 (Right
VS 2.8
VS 2.8
RTN
RTN
Ve 2.6
RTN
Vg 15
D5v 5.3

CN806 (Left)[/B]
5 0
RTN
RTN
Va 0
Va1 0

CN812 (Right)
5 0
RTN
RTN
Va 0
Va1 0

CN842A
RTN
Fan3 0
Fan2 0
Fan1 0
RTN
STD-5v 5
Them-D .04
Vm-UV .27
oV 5.4
PS-ON 3.3 when unplugged .5 plugged in
VT 33

CN841A
RTN
RTN
D3.4v 3.38
RTN
VmIN 16.7
RTNa 0
Amp 21.6

CN803
RTN
VS-ON 0
N.C 0
N.C 0
RTN
D5.3v 5.3
RTN
RTN
D3.4v 3.38
D3.4V 3.38

Second Power Supply Board
CN801
RTN
VT 33
RTa 0
RTa 0
amp 18.3
amp 18.3
RTN
A12V 12
RTN
A6V 6

CN802
Fan on/off 3.34
Std-5V 5
RTN
PS-ON 2.78 unplugged / 0 plugged in
D12V 12
RTN
RTN
3.4v 3.38
3.4V 3.38
RTN
D6V 6

[PlainBill]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Any connector that said 3.4v only had .4

I didn't find any 12v on the power supply board.
But I did find 2 on the board to the left of the power supply board.
There was 0v

I didn't find any connectors marked higher then 12

There are a serval voltages written near the bottom of the power supply ranging from 3.4. 5, 12 14, and 33
but there are no connectors near buy just some bars.

If I unplug the tv and wait a minute, then plug it back it, while the relay is on I get 12v and 3.4v, on the connectors, but that only lasts a few seconds.
Also get the same response on two white wires that are 5v volts on the left side of the power supply.

In order to get the relay to kick on I have to wait about a minute with it un-plugged.

thanks

As you indicated, a service manual would be a big help. It appears this TV has a main supply (big green board almost smack-dab in the middle) and an auxiliary supply just to the left of it (tight tan board). There is a white label near the upper right corner of the panel. It lists a number of voltage identifiers (Va, Vs, etc). These voltages go to the Y (left side) and Z (right side) sustain cards. Check those voltages. Again, they would only be present for the time between the first relay click and the second.

It APPEARS the power supply is working, at least in part, but the main controller (small signal board) is detecting an error and shutting the power supply down. The fact you have to unplug power for a minute or two is normal. Once it detects a fault and shuts down the main supply it ignores all attempts to turn the supply back on until the power is reset by unplugging it.

PlainBill

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Any connector that said 3.4v only had .4

I didn't find any 12v on the power supply board.
But I did find 2 on the board to the left of the power supply board.
There was 0v

I didn't find any connectors marked higher then 12

There are a serval voltages written near the bottom of the power supply ranging from 3.4. 5, 12 14, and 33
but there are no connectors near buy just some bars.

If I unplug the tv and wait a minute, then plug it back it, while the relay is on I get 12v and 3.4v, on the connectors, but that only lasts a few seconds.
Also get the same response on two white wires that are 5v volts on the left side of the power supply.

In order to get the relay to kick on I have to wait about a minute with it un-plugged.

thanks

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

ok thanks

[retiredcaps]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

What other outputs?

Where would I find them on the board?

The other outputs are the other voltages like 12V, 3.3V and 19VDC depending on the design. They will be written down on the PCB right next to all the connectors (those that start with CN).

Same as the 5VC STD as before.

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Thanks PlainBill

What other outputs?

Where would I find them on the board?

I sure wish I could find a service manual for this thing.


Thank you

[PlainBill]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Ok did some more checking.

I think I was checking at the wrong place.
I checked at the bar where the CN842A was writing on the board.
There is not any voltage there.

But I looked around and the connector and realized it said STD-5V.
I couldn't see it with the plug in.
So with the connector plug in I checked the votagle in the connector and there was a solid 5V there.

Thanks

That's as expected. And the fact that the relay clicks indicates that the power supply is being turned on. The next step would be to check the other output voltages. Since the relay clicks only once (and then presumably opens), it's not likely you will be able to get a stable reading, but it will be good to know if none of the other outputs come up, some of them come up, or (best of all), all but one come up.

PlainBill

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Ok did some more checking.

I think I was checking at the wrong place.
I checked at the bar where the CN842A was writing on the board.
There is not any voltage there.

But I looked around and the connector and realized it said STD-5V.
I couldn't see it with the plug in.
So with the connector plug in I checked the votagle in the connector and there was a solid 5V there.

Thanks

[DigitalRambler]

Re: Samsung PS-42P4H Plasma Turns on and off clicking

Thanks Guys

Checked the fuses again all are about .35 ohms.
Couldn't find anymore.

Checked for voltage at the CN842A test point. But there was none.
I tested it using several screws as ground, an RTN point near CN842A and some of the RTN points in a couple of the plugs.

I thought the relay was kicking on and off but, it only clicks on once then shuts off.

Let me know where to head next.

Thanks for the advice

I was kind of hoping that this would be as easy as a monitors too, but knew it was probably going to be more of a challenge. I just really want to learn how to fix it.