Re: Samsung PS-50Q97HD powersupply problem
I have managed to obtain replacement Panasonic SMD Capacitors of the same values. I have changed out like for like and the problem of clicking is still occuring. I read on another thread that when the Power Board goes faulty it is possible to corrupt EEPROMs on the Main Board. With that in mind I think I will investigate obtaining a replacement Main Board. It would have been interesting to nail down the actual problem, but not having access to all the necessary equipment and firmware make it impossible.
mjharrisuk
Member
Last Activity: 03-24-2017, 12:11 PM
Joined: 02-23-2015
Location: Middlesbrough
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Re: Samsung PS-50Q97HD powersupply problem
Thanks! I will take some instruction via Youtube before I have a go. I will need to order up some capacitors as well.Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Those two capacitors C1110 & C1177 sit on what appears to be a plastic base with solder connections on two sides of the plastic base. Before I do irreperable damage by my ignorance could I just clarify that the removal of these capacitors is by desoldering those connections? or as there are slots between the base of the plastic and the capacitor do they lever directly off the plastic base i.e. plug in. I would rather declare my ignorance than cause damage.Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Main Board is marked as BN94-01177B. On removal of the PSon connection from the Plug/Socket CN801 and replacing it with a grounding connection the TV comes on but the picture is still cycling on/off with no sound of relay operation on Power Board. Measuring the voltage on the removed PSon cable connection from the Main Board gives the following volts:-
0.686VDC TV is stable in operation. Elevated 3.407VDC for @ 4 seconds picture/TV operation is lost. (Attached image of Main Power Board)...Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Thanks for the clarification flocko. I was reading between two seperate posts that gave differing details for wiring connections confirming the test patterns. I have now aligned the connections for the Logic Board as you describe (except the test pattern links are across 5 and 6) and the test patterns are running continuously with the CN801 Plug removed and a link fitted on the CN801 Socket giving Vson to ground. There is no clicking of the relay on the Power Board. Based on your last post this would confirm the problem lies with the Main...Leave a comment:
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Re: Samsung corrupt mainboards
Tom by doing the test of the Power Board in a stand alone mode by disconnecting the CN801 Plug/Socket and grounding the PSon and confirming that the supply is stable and all voltages are as stated. Then doing a test pattern with the Logic Board link in place while the LVDS Cable is disconnected and confirming the test patterns run satisfactory. Is that good enough to confirm that any clicking of the relay on the Power Board when all is reinstated is derived from a faulty Main Board via the PSon connection. Is it possible to complete any further tests...Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
I have now found out that the link on the test plug on the Logic Board should be across pins 5 & 6. On trying this with the LVDS cable disconnected from the Main Board the test patterns operate correctly on the screen. The clicking of the relay still occurs after several minutes. So now that the Power Board has been proved to operate satisfactory and solidly without the Main Board connection to CN801 and by grounding the PSon connection does this now signify that the problem lies with the Main Board? Are there any tests that can be...Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
With all connections to plug/sockets reinstated except for the LVDS cable disconnected at the Logic Board, I have fitted a link across 3 & 4 pins on the Logic Board to try and run the test pattern. On applying the AC supply I get no display at all on the screen. When I power down and remove the link to 3 & 4 and reinsert the LVDS cable at the Logic Board and reapply the AC supply I am back to having the display on the screen and the cycling of the relay starting again. Any further thoughts by anyone on what I can test? What are...Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Is anyone aware of where there is a description of what should occur, and in what sequence when running the Test Pattern scans on a Samsung Plasma?Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
OK flocko. Before I energise anything can I just confirm that I have all set up correctly. On the Main Power Board all Plugs/Sockets (except CN801 to the Main Board) are connected. On the logic board I have a link between pins 3&4. When I apply AC I will activate the relay by grounding PSon. Is that correct?Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Upper 5 Left Pins are marked CN2008 and the lower 6 Left Pins are marked CN2010. I have tried searching for running the Test Pattern associated with this TV logic board. As far as I can see from other posts associated with other TV logic boards I need to short pins 3 and 4 and it allow it to run through the screens sequence. Is that correct?Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
I have exposed the logic control board and attached a picture. Could you confirm if it is the block of six pins at the bottom left or the five inline pins at the top left that are the ones to be used for the Test Patterns?. Incidently when I had the AC supply on with the PSon grounded and the resistor fitted onto VSon to Stby a single green LED was flashing on the logic board and two other LEDs were solidly illuminated....Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Installing the plug back into CN801 Socket while leaving the resistor in place and applying the AC causes the intermittent clicking of the relay to commence again.Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Thanks for the direction flocko
OK removing all plugs except the AC supply and grounding the PSon pin does cause a relay to click and become held on. With that carried out, checking all the voltages in the same positions that i originally listed I get the same values on all positions except there is now the loss of voltage on the Vs Test Point.
When I apply a resistor across VSon and the Stby connection VS is elevated to 207VDC. Leaving the connection applied over a period of time there has been no clicking of the Relay....Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
What I believed to read Ve was actually Vg on the Power Board. I have rechecked Ve on the X Board and it is 94.1VDC (pic 1427). Vg on the Power Board is measuring at 15.1VDC (pic 1426)....Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
The Voltages all match the labels on initial powering up. After the 5 minutes of warm up the Relay starts clicking and seems to loop on/off in approx 15 second periods. With the Relay clicking the voltages applied to the Rectifiers is being switched on/off so the whole circuit supply is being affected. Initially I narrowed the problem down to the Power Board by disconnecting the X & Y Boards and the clicking still existed. I noticed two bulging capacitors on the Power Board. After reading that the CapXon capacitors did not have a very...Leave a comment:
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Re: Samsung PS-50Q97HD powersupply problem
Power Circuit Board Type BN44-0162A
Problem with Relay Clicking and Cycling On/Off occurs after 5 Minute warm up and normal TV operation. Problem has been proven to still occur with Xsus & Ysus PCB Board Plugs disconnected from Power Board.
In an attempt to resolve problem the following has been carried out:-
1) Replacement of bulging CapXon Capacitors with new Panasonic type of equivalent values on Power Board
2) Replacement of FETs QS801/QS802 & QX801/QX802 on Power Board
On...Leave a comment:
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Re: New Members - please post your introductions here
Hi all. I am a rookie to electronic component repair based in the UK and looking for guidance and knowledge that I can glean from you folks. Over the years I have collected a garage stocked with defective electronic equipments and now I am retired I have the time to start to investigate and to look and learn. I`m starting with a Samsung TV which I hope to get back into operation.
Hope I can get to know some of you better over the coming years and improve my know how along the way.
Thanks
...Leave a comment:
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