Re: Samsung Plasma TV
I checked what I paid for the set in April 2014 -- $1,800 US, so I'm willing to spend up to about $500-ish to fix it, considering that new similar-sized UHD sets (might as well upgrade if I have to buy new) are running about the same or more. Nothing new on the troubleshooting front -- family & household have currently taken priority and we're using a smaller set from another room as a backup. Hoping to continue troubleshooting tomorrow.
Paul Vallandigham
Member
Last Activity: 02-15-2017, 06:54 PM
Joined: 01-31-2017
Location: Hemet, CA
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Re: Samsung Plasma TV
I popped the Y board off using a flat blade screwdriver between the boards to gently start it loose. No charring on the bottom side or on the plasma panel, and using a flashlight I saw no bulging/burnt MOSFETs under the heatsinks or dry solder connections on the front or the back. Figured I'd try the X board next. Same story. Went for the main board, same story. Re-attached all 3 boards & reconnected everything and now I've lost the sound, too. I figure I'll pop the power board off tomorrow to inspect the back and then start the troubleshooting...Leave a comment:
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Re: Samsung Plasma TV
At the connector sending power from the Pwr Supply to the Y board, initial pwr up:
Va = 54.6 V, then discharge (both Va pins)
Vs = 215 V, then discharge (both Vs pins)
The above values hold, regardless of whether all cables are in place, just the cable to the X board (from the Y board junction) is unplugged, or the cable to the Y board is unplugged.
At the X board signal/pwr input connector, Ve-in = 141 using chassis grnd,107 using test pad grnd.
Any advice on how to remove the...Leave a comment:
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Re: Samsung Plasma TV
I'll have to get back to you tomorrow. My remote control operator is not currently available to make it easy to grab those readings in the first 3 seconds of power-up (I assume that's what you're looking for. I have readings at that connector post-fault shutdown if that's what you need: Va = 0, 15V = 14.87,Vs = 6.8, Vs #2 = 6.8 [one for the Y board and one for the cable leading to the Y board and then on to the X board, I'm guessing)....Leave a comment:
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Re: Samsung Plasma TV
1Last edited by Paul Vallandigham; 02-11-2017, 06:52 PM.Leave a comment:
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Re: Samsung Plasma TV
Here's what I got:
PS ON (Pin 1) 3.28V Standby 3.28 Initial Power-up, then rapidly down to 0.11
VS ON (Pin 17) 0 V Standby 3.25 V Initial Power-up BRIEFLY, then 0 VLast edited by Paul Vallandigham; 02-11-2017, 06:26 PM.Leave a comment:
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Re: Samsung Plasma TV
I'll let you know ASAP....Leave a comment:
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Re: Samsung Plasma TV
That last pic I sent shows the readings I got on that power board connector going to the main board (during fault shutdown). Do I need to test those (and at the power board connector going to the Y & X boards) during that initial 3-second power-up before fault shutdown?Leave a comment:
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Re: Samsung Plasma TV
After locating all test pads, I got the following voltages on initial power up (before fault shutdown):
On Y board:
VSCAN =-208
SVC_YOUT = -187 VERY briefly
SVC_VS = 215
On X board:
SVC_VS = 215
SVC_VE = 107
As there was no SVC_GRND pad on the Y buffers, I decided not to test those voltages in case grounding elsewhere might cause more problems.Last edited by Paul Vallandigham; 02-11-2017, 05:49 PM.Leave a comment:
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Re: Samsung Plasma TV
Here's what I got on that connector while the TV was in fault shutdown (no Va or Vs)....Leave a comment:
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Re: Samsung Plasma TV
Thanks for the clues, rccrasher65. Looked again and found the following test pads:
On the Y board:
VSCAN (could this be Vsc?)
SVC_YOUT (could this be Vsc?)
SVC_GRND (obviously ground)
SVC_VS
SVC_GRND (same as above)
On both of the two Y buffers:
SVC_OUTL
SVC_OUTH
On the X board:
SVC_GRND
SVC_VS
SVC_VE
The labeling was a little confusing, as it was different than on the power board....Last edited by Paul Vallandigham; 02-11-2017, 04:53 PM.Leave a comment:
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Re: Samsung Plasma TV
As you reported, got nothing when I waited after initial power up to measure. I had my wife grab the remote so the meter leads were in place on the test points when she turned it on. Va shows 54.8, Vs shows 215, so the power supply seems to be working (voltages dropped to zero within a few seconds, so I assume that's capacitors dissapating after fault detect shutdown). Measurements remained the same whether both X & Y cables were connected, one or the other was disconnected, or both were disconnected. Also got good 15V and 5V coming into...Leave a comment:
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Re: Samsung Plasma TV
OK. Thanks for the clarification. I'll see what I can find.Leave a comment:
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Re: Samsung Plasma TV
OK, I get much of what you're saying, but you lost me with a couple of those abbreviations. Can you either explain them or give me a link to a webpage that does?
"The power board has a standby dc 5V when switched on at PP..."
PP = plasma panel? If so, it's not clear to me what you're saying.
"...control 12v sound about 18v and Vs about 200v and Va about 65V (correct values should be on a label on rear of panel) at turn on with RC."
RC = remote control?
And thanks for directing...Last edited by Paul Vallandigham; 02-11-2017, 02:23 AM.Leave a comment:
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Re: Samsung Plasma TV
Saw no obvious signs of burnt components and none of the typical odors thereof. I assume these voltages are all DC, right? And is there a way to discharge multiple capacitors at once, or must they be shorted individually? Any other components that retain a dangerous charge?Last edited by Paul Vallandigham; 02-10-2017, 06:48 PM.Leave a comment:
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Re: Samsung Plasma TV
OK, shot some pics for reference. Any ideas where to look for test points to get Va, Vs, Ve & Vse readings?...Last edited by Paul Vallandigham; 02-10-2017, 06:07 PM.Leave a comment:
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Samsung Plasma TV
I repaired analog aircraft radios (mainly module swapping) for the Air Force in the late 1970's, so I am familiar with basic electronics, but have no clue about video. Looked briefly in the theory forum and didn't find anything about general video theory. Also have some limited experience doing upgrades and repairs of desktop computers. Hoping to save some money by repairing our TV myself, if possible. I've looked at other threads, but their symptoms don't quite match.
The TV is a Samsung 64" plasma, model # PN64F5500AFXZA,version # UW01, serial # Z6VY3CBFZ00037A.
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Re: New Members - please post your introductions here
Hi. I'm a consumer looking to avoid a high-priced repair bill for my Samsung Plasma TV. I was trained to repair 1960's-vintage vacuum tube aircraft radios with motorized tuning circuits for the Air Force back in the late 1970's. Also have limited experience doing minor repairs and upgrades to desktop computers. I can solder and have a digital multimeter. Looking forward to some helpful advice and tips.Leave a comment:
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