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Re: LG 50PG20-UA Plasma - ** NO POWER **
From the service manual:
Would this indicate that RL-ON is the PS-ON equivalent that I am looking for? If so, then according to the previous request I need to jump this to ground and jump 5V to VS_ON and then take another measurement across the PFC?When the Micon (IC100) on the Main Board receives an “ ON “ Command from either the Keyboard or the
Remote IR Signal it outputs a high to RL-ON which enters the SMPS Board at Pin 19 of P803. The RL-ON
command is sensed by the Sub Micon (U701) circuit which causes the Relay Drive Circuit to close Relay
RL101 bringing the primary source voltage up to full power by increasing the 155V standby to 330V. At
this time the 16V and 12V source becomes active and sent to the Main Board via P803. The relay on
command on the main board turns on a 5 V general regulator that creates a 5V Det signal that is also set
to the Power SupplyComment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
No, you need to find the short first. I mean if there IS a short. Can you measure the current through the light bulbs? The fuse is a 10A as far as I remember... The lamp current is probably much lower, not sure there is a short... But then, the 10A fuse blows.. :-/
You could draw part of the circuit for us because we need to know where fuse 801 goes to.Comment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
I get 0.44A through the bulbs.Comment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
If you remove the fuse and bulbs, are you able to measure the short circuit , from fuse "output" to primary ground?
If in doubt post a picture of the bottom layer of this board and I mark where to measure.Comment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
Here is a picture of the bottom.Attached FilesComment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
ok, remove the fuse 801 and measure resistance where marked.Attached FilesComment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
Thank you. Fuse removed, board out of the set and on the work bench. I'm getting appx 1ohm. fluctuates a bit from 0.9 to 1.3. almost no resistance...so clearly a short somewhere?Comment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
Yes. If you could take a better focused picture of the red area that would help.
You just need to follow the trace coming from the fuse and you will probably find the defective component. I still think it must be something bigger, diode or FET etc.
I'm assuming you measured from the what is the left fuse terminal (on the picture) to ground?Attached FilesLast edited by paulstef; 06-01-2015, 02:42 PM.Comment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
Here is a better picture of that area.
And yes, I measure between the indicated points in the photo you uploaded. The left leg of the fuse to the ground. I tested this with a few points on the ground plane to confirm that all had the same results.Attached FilesComment
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Re: LG 50PG20-UA Plasma - ** NO POWER **
I've double and triple checked the larger transistors and diodes attached to the heatsinks and I'm not having any luck finding anything bad. Tried tracing the circuit and no luck there either. I'm either missing it or somehow measuring wrong. But getting expected readings so I presume that I've just not tested the bad component yet somehow....
Any thoughts on how to proceed from here?Comment
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Hello,
I am having Samsung PS51E550 Plasma TV. While the TV was working, a crackling sound heard & video went off with audio still ON. After switching it off & ON, the red LED on TV blinks six times & then off.
Opened TV cover & observed foll
a) Green LED on the small PCB blinks at @5-6sec ON & off for 3-4 secs. Red LED on logic board ON
b)Vs & Va on power supply board raises momentarily to 209v & 58v resp & then drops.
c) Cold test on Y-main board shows all 3 pins of FGPF4536 IGBT short to Grnd.
How to confirm Y -Buffer board... -
Hi,
anyone able to provide the service manual for old plasma Panasonic TX-P42ST50E?
It turns off almost immediately (0~5 seconds after pressing the on/off button) and starts flashing the red diode 6 times.
I disconnected the left-hand side board (SC?, both the ribbon cable and the power cable to it) and also another ribbon going to bottom left board. Then the led signal is 8 flashes. According to service guide to another Panasonic plasma it would mean the left-hand side board is faulty. But I'm not sure it 100% applies to my model.
I checked that board for any obvious faults... -
Picked up a bahemoth plasma TV not too long ago and just now getting around to looking at it.
No picture but you hear the TV static (white noise) playing loud and clear.
The back was already taken off (and no screws were provided) as the previous owner had already taken a look.
But it seems they didn't get too far and just left it.
When I first took a look I was amazed at how pristine the inside looked.
Its as if the TV had been in a time capsule.
Caps looked like they were just pulled off the self.
Copper coils had no sign of corrosion on... -
Hello . I have a problem with a samsung plasma tv stuck in bootloop . The TV is Samsung PS51D6900DS plasma smart tv .Need help if anyone have any suggestions
Thanks a lot !! -
I recently found myself the proud owner of a later-model Samsung plasma (the PN59D7000 for those keeping score at home) whose panel was, unfortunately, damaged in transport. I'm now preparing to part it out, but am curious as to whether or not any damage would have come to any of the components by attempting to power it up with the panel being broken. I read in one Avsforum thread (for whatever that's worth 😂) that the "scan driver boards" (by which I assume he means buffer boards) could be impacted by doing so. Is that actually the case? If so, since I don't intend on selling bad...
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