I'll see what I can do about a digital scope although it might take a week or so. Stay tuned
EmDeeZed
Member
Last Activity: 04-24-2019, 07:31 AM
Joined: 04-03-2015
Location: Melbourne
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Re: Samsung PS58C7000YFXXY - Sound but no picture
I'll see what I can do about a digital scope although it might take a week or so. Stay tuned
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Re: Samsung PS58C7000YFXXY - Sound but no picture
OK - I hooked up the CRO as indicated and this is the result...
50v/div @ I think .5ms/div
You can see the reading jump to about 15v when the TV is turned on, then a small burst of activity.
[url]http://youtu.be/WIb9l8gVRuY[/url]Re: Samsung PS58C7000YFXXY - Sound b...ctivity.<br />Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
I have an idea but if you could point it out then that would be great. Thanks....Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
I finally got a chance to test. We got very brief activity.
I posted 2 links so you could see the result, one at 5ms/div, one at 50us/div, both at 50v/div as suggested.
[url]http://youtu.be/4sg3ScymxNQ[/url]
[url]http://youtu.be/61Ky59A7oRA[/url]Re: Samsung PS58C7000YFXXY - Sound b...ggested.<br />Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
OK, here is the Y-Main. Hopefully it is clear enough. If not I will upload the board spit over two pictures....Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
Here it is - it's nothing to get excited about but is does work! I also have a 10x probe. The TV does have an earthed ground chassis so no need for an isolation transformer which is good as I do not have one...
How / where should I check the sustain outputs? Thanks....Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
Yes - I have an oscilloscope.Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
Sorry - it's a picture I took before disconnecting the ribbon connectors - I should have mentioned that...
I tested both sides of the connector on the PCB once the ribbon connectors were removed. Not a peep from the meter.Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
Thanks for the link tom66! I tested the Y-Buffer as shown but no shorts.
There are no markings on the connectors (see pic) so had to look for groups of pins tied together. There are no test points for the controllers and with heat sinks on top - no damage can be seen either.
Is it worthwhile poking around on the X-Main? Thanks....Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
Ok - I have checked the panel for cracks by using a torch on an angle over the screen but did not see any cracks. Is there a better technique?
For what it's worth, we had been watch the TV for about 30mins when it stopped. Can the panel crack / fail like this while in use?Leave a comment:
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Re: Samsung PS58C7000YFXXY - Sound but no picture
For reference, on this TV Va=55v, Vsc= -200v, Vs=210v and Ve=90v.
When the TV is turned on, Vsc (marked Vscan) on the Y-Main holds at -200v for about 10-15 seconds then slowly drops to 0v.
On the x-Main board, I could only find a test point Vb. That test point reaches 89v for a second then drops to 14.6v.
The LED on the control board blinks quickly 2-3 times when the TV is turned on but then settles to 5 seconds on, 2 seconds off, 5 seconds on - etc etc.
I could not identify what lives...Leave a comment:
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Samsung PS58C7000YFXXY - Sound but no picture
Hi Guys. I'm hoping to get some help with my Samsung PS58C7000YFXXY. A few nights ago we lost picture after a small “pop”. It still has sound and like many of these Samsung plasmas had the occasional purple banding on brighter scenes.
Anyway, I ripped the back off hoping to find burnt remains of something but cannot see or smell anything!
This TV has the BN44-0034A SMPS and as far as I can tell the TV is going into fault protection as the logic board LED flashing on for 5 seconds.
[B]Vital Signs.[/B]
The Standby 5v is at 5.23v, and the PS-ON shifts from 3.26v... -
Re: New Members - please post your introductions here
Hi Guys. Easter holidays have just started and on cue - the TV dies... Digging around for answers brought me here. Hopefully I can keep another TV out of landfill but if not I will enjoy challenge anyway. Thanks in advance, the forum has been a great resource already!Leave a comment:
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