To trouble shoot what appears to be a bad Plasma PS, disconnecting all of the daughter boards, where should a load go and how much to have the supply up and running to check voltages?
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Re: Testing a Plasma PS without any boards connected?
Yes--Its possible with some of them.
What make/model are you working on? The procedure is different for different makes....
Like-- some Samsung you would deck the PS-On with a 1K and apply the Std-by 5V to the Vs-On via 1K
Some LG you would supply 5V via 1k to RLY-On and PS-On as well as Vs-On.
Use a 240V 150-200W Incandecent Bulb as a load for the Vs to check it.....
IF its a Philips with I2C comms PSU--Bin It, you'll never get the PSU to run without the set connected!
So--It All Depends on Make and Model, and whether its even possible.....TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM! -
Re: Testing a Plasma PS without any boards connected?
LG 60PK250/550 from 2010
Using a load, is that with all the boards connected or disconnected?Last edited by videobruce; 10-03-2014, 10:39 AM.Comment
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Re: Testing a Plasma PS without any boards connected?
Thats with the PSU on the bench, connected only to the bulb and whatever is needed to get it to run.
--ie, Not in the set.TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!Comment
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Re: Testing a Plasma PS without any boards connected?
I happened to stumble across a "training manual" for a similar series set and there are two pages on testing under load that are written differently. The 1st says nothing about disconnecting it from the rest of the chassis. The 2nd version tells you to disconnect the connector to the main board. Nothing about removing the board from the rest of the circuit on either.
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The other version is here;Using two 100 Watt light bulbs, attach one end to Vs and the other end to ground. Apply AC to SC101. If the light bulbs
turn on and VS is the correct voltage, allow the SMPS to run for several minutes to be sure it will operate under load. If
this test is successful and all other voltages are generated, you can be fairly assured the power supply is OK.
With P813 disconnected from the Main board (P301) attach two 100 Watt light bulbs, attach one end to Vs and the other end to ground.
Apply AC to SC101. If the light bulbs turn on and VS is the correct voltage, allow the SMPS to run for several minutes to be sure it will
operate under load. If this test is successful and all other voltages are generated, you can be fairly assured the power supply is OK.
Note: To be 100% sure, you would need to read the current handling capabilities of each power supply listed on the silk screen on the
SMPS and place each supply voltage under the appropriate load.
Note: Placing the two 100 Watt light bulbs from Vs to Ground will assure the power supply will regulate with a load and no other Abnormal conditions may result.Comment
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Re: Testing a Plasma PS without any boards connected?
You asked--- 'Testing a Plasma PS without any boards connected?'
I said, Yes--some you can, and described how to do so.
You have maybe confused things by reading a manual that assumes the PSU is in the set--not on the bench.
--To do that procedure in the manual you'll need to disconnect the SUS boards but keep mainboard connected (so the micro can turn it on), put 150W 240V bulb on the Vs output of PSU.
Why do you think your PSU is faulty anyway?
Does any voltages come up, then die away on turn-on?, No STby 5V? no stdby red-light? What?
Whats happening? Any shorts on the Vs lines? blown fuses...?
Is this one of those LG 60" that have Two PSU's....? I dunno, Never ever seen any 60" for repair thankfully, would kill me to carry such an obscene monster up three flights of stairs anyway!TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!Comment
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Re: Testing a Plasma PS without any boards connected?
When plugged in, the standby light flashes twice and then dies. Nothing is coming off the PS as far as I can tell. No relay clicking.
It's a LG 60PK250. The supply looks clean, no burns, cold solder joints or bulged caps. Most all connectors where disconnected and the reconnected more than once in case it was a contact problem.Comment
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Re: Testing a Plasma PS without any boards connected?
My 60pk250 only I can ear click and click the caps looks fine the resistor are good the fuses too my suspect is the regulator 3br1565jf some help to fix itComment
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I have three identical-spec 820-01700 boards (2.6/32/512), and ALL THREE boards came to us with the same fault, from different sources: The boards don't wake from hibernation with the keyboard or lid, they ONLY wake when you press the power button. I understand this is a very minor issue, but the boards must be fixed!
We will of course begin with the obvious (checking lid signals), but I couldn't help but notice these three boards were all 32GB variants. Has anyone noticed an issue relating to these 32GB boards in particular? I of course don't think it's a RAM issue, but it's bizarre... -
Hi all.
I have 2 Panasonic plasma A boards for ST50 50"/65" and Kuro KRP 500A media box which needs repair.
I'm not good enough at component repair so I need some help.
A boards and especially Kuro media box is still very valuable and I can't throw it away like some average Joe,lol
I'm from Europe/Slovakia and I'm searching for someone who is willing to repair these things or some tips at least.
Both A boards have HDMI issue either no signal or flickering.
And media box possibly with voltage regulator issue which is common... -
Please give me your opinion on this test method.
i have never seen anything like it but want to give it a shot ASAP!
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I have a stack of liquid damaged A2338's, most of which don't draw more than 5v and thus won't turn on.
So far I've put back the main boards back after cleaning and repair attempts and connected every single component before testing. This obviously take a huge amount of time.
My question is (maybe not limited to A2338 boards): what's the bare minimum that needs to be connected in order to test if it will draw 20V? Should it draw 20V without the battery connected? -
We've now created a stack of 10 boards that have the same issue, which we suspect to be CPU-related. The issue is very simple--the board will not boot to anything, only showing the exclamatory sign inside a circle. No amount of DFU/restore, wipe/erase, etc, will resolve the issue. No boards have physical damage. We went ahead and replaced the SSD nands on two boards (one 02020, one 02016) and the issue remained exactly the same. We are considering replacing the CPU on one of the boards using a locked CPU, just so we can see if it resolves the issue.
Has anyone else run into this...
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