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Rlreynolds1971
Joined: 25 Oct 2014
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 Posted: Sat Oct 25, 2014 1:04 am Post subject: Samsung MODEL 50B450B1D |
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| I have a plasma samsung tv model 50B450b1d. The tv clicks but does not give me a picture. I am an electronics tech experienced in areas other than tv's. have fixed some tv's in the past with this sites help so I am capable so please give me some technical advice on this repair. First off I have my red led lighting up, I hear the two relays click so the power supply is trying to come on but it turns right off. I removed the back and inspected the power supply all caps appear good no swelling no leaking. I first removed all cables but the power coming in. I removed the cable going to the logic board, and jumper'd the 5V to the PS on one cable and 5V to Stby pin to allow the power supply to come on and it does. I checked voltages. This ps board had 5.3V and 15 volts. I have my 5.3 Volts but I did not measure any 15 Volts on any of the designated pins. It is easy to say change the board but I would like to repair mine. The board part number is PSPF520501A. One question is would I have to jumper the VS/on on both cables to get the Va and Vs voltages to kick on? just curious. Other question can anyone give me a schematic for that power supply or tell me what to check. thanks guys I really appreciate it, and my 3 young children appreciate any help cuz this is for their video games. thanks |
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jts1957
Joined: 24 Nov 2008
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Rlreynolds1971
Joined: 25 Oct 2014
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| Posted: Sat Oct 25, 2014 2:01 pm Post subject: Samsung MODEL 50B450B1D |
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| well they did not show the schematics for this model any other options you may have for me? thanks |
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jts1957
Joined: 24 Nov 2008
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| Posted: Sat Oct 25, 2014 5:11 pm Post subject: |
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| Rlreynolds1971 wrote: | | The board part number is PSPF520501A. One question is would I have to jumper the VS/on on both cables to get the Va and Vs voltages to kick on? just curious. Other question can anyone give me a schematic for that power supply |
https://www.shopjimmy.com/samsung-bn44-00274a-power-supply-unit.htm
If you scroll down on SJ page you will see that your board number subs over to the numbers at ET. Scroll down at ET site (after making your choice of one of the three) under preview pane and wait until "Get Manual" appears.
They may also have a troubleshooting manual for a (PN)50B450B1D - http://elektrotanya.com/samsung_pn50b450_troubleshooting_guide.pdf/download.html
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Rlreynolds1971
Joined: 25 Oct 2014
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| Posted: Sun Oct 26, 2014 2:16 pm Post subject: |
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ok I see it now. I did not realize those other numbers crossed over, they are actually on the board I have as well. So awesome. I have a question now. To make the board turn on on the bench Is this what I need to do?
For Low Voltage
Jumper PS_ON to standby on connector CN801
Jumper 5.3V to PS_ON on connector CN802
For Vs and Va Voltage
Jumper what?
I jumpered for low voltage and the power supply turned on I only had the 5.3Volts but had no 15Volts, I am assuming the absence of 15 volts is the issue with the board but I'm assuming I will look at schematic the power supply schematic on the bottom of the first link you sent me is the one. thanks |
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Rlreynolds1971
Joined: 25 Oct 2014
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| Posted: Sun Oct 26, 2014 11:00 pm Post subject: Samsung MODEL 50B450B1D |
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Well I broke down and found one on ebay pretty cheap they claim it's good so we will see. Would you agree with my troubleshooting below:
The tv has the standby voltage as my red led on front of set is lit up, and I measured it 5 volts.
When turning on the tv you hear both relays click on and then the set turns itself off. red led remains lit.
I opened the back of the set and disconnected all cables that go to the x and y boards, so the only thing connected was the cable going to the logic board to turn on the tv. Even then the set just turns on...then you hear the two relays and then off again. So It must be the power board correct?
thanks again for your help.
The only schematic that was on that website was close but not exact, I figure for the money it really was more cost effective to just order a board, by the time I buy some of the parts and my time, heck I'm half way there money wise. |
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jts1957
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| Posted: Sun Oct 26, 2014 11:27 pm Post subject: |
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Which one was 'close?'
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Rlreynolds1971
Joined: 25 Oct 2014
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| Posted: Mon Oct 27, 2014 1:35 am Post subject: |
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| SAMSUNG BN44-00274B SCH was the only one that came up. The components dont really match up not all of them but some of them. Mine is a BN44-0027A. thanks |
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jts1957
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| Posted: Mon Oct 27, 2014 2:21 am Post subject: |
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??'274A' & '274B' were BOTH listed??
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Rlreynolds1971
Joined: 25 Oct 2014
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| Posted: Mon Oct 27, 2014 2:45 am Post subject: |
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| i downloaded the A version it looks like what i have, i did not download it because it did not say power supply it just said inverter but the whole circuit is on there my fault. Do you agree with the fact that it is probably the power supply board in my troubleshooting process ? thanks |
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