looking for power supply schematic


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looking for power supply schematic

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streamview
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Feb 26, 2018, 2:45 PM

Post #1 of 10 (4097 views)
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looking for power supply schematic	Can't Post

hi every one.
I am looking for a schematic for Samsung TV power supply l46s1v_dsm.
any chance some one have it?
the TV is Samsung un 46f5500

thanks

jts1957
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Feb 26, 2018, 7:03 PM

Post #2 of 10 (4092 views)
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Re: [streamview] looking for power supply schematic [In reply to]	Can't Post

I can't find one. BN44-00611A or D / PSLF141S05A are other numbers you can Google.

If Dead/No backlights, on some models unplugging CNM803 should allow LEDs to light until you unplug set from power.

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Location: Far, Far Away

streamview
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Feb 26, 2018, 7:29 PM

Post #3 of 10 (4089 views)
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Re: [jts1957] looking for power supply schematic [In reply to]	Can't Post

I tried also to search for BN44-00611D , but didnt find any. <br>when I plug the tv to the power , it will turn on normal 20% of the time. <br>i checked the standby voltage , ad its ok. and from the main board i have 3.2 come for 2 second to the power supply ps_on ad then it become 0 again , 3.2 v then 0 v and keep doing this untill the power supply kick in , then ps_on stay at 3.2 volt. i feel that there is something wrong with the power supply. <br>if I unplug the cable , sometimes the backlight come on and sometimes no. <br>

(This post was edited by streamview on Feb 26, 2018, 9:30 PM)

jts1957
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Feb 26, 2018, 10:52 PM

Post #4 of 10 (4083 views)
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Re: [streamview] looking for power supply schematic [In reply to]	Can't Post

Quote

and from the main board i have 3.2 come for 2 second to the power supply ps_on ad then it become 0 again , 3.2 v then 0 v and keep doing this untill the power supply kick in

Can I presume A5V is present as long as set is plugged into Mains? What happens if you apply an external 3ish volts to PS_ON? IF all the time the 3.2V volts is present the set works normally then Main board is more likely.

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Location: Far, Far Away

streamview
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Feb 27, 2018, 2:46 AM

Post #5 of 10 (4077 views)
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Re: [jts1957] looking for power supply schematic [In reply to]	Can't Post

yes i have the A5v always as long as I apply power.
thanks for pointing me to test with external 3.2 volt.
tomorrow I will try it , and see what will happen.

streamview
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Feb 27, 2018, 9:51 PM

Post #6 of 10 (4071 views)
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Re: [streamview] looking for power supply schematic [In reply to]	Can't Post

so I turned on TV without the CNM 803 cable , and there is no back light.
I applied external 3.3 volt to PS_on , and still the same , no back light.

I guess this means that the power supply is bad.

jts1957
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Feb 28, 2018, 1:36 AM

Post #7 of 10 (4069 views)
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Re: [streamview] looking for power supply schematic [In reply to]	Can't Post

What happens with CNM803 plugged in and external 3.2V applied to PS_ON?

You said:

Quote

it will turn on normal 20% of the time.

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Location: Far, Far Away

(This post was edited by jts1957 on Feb 28, 2018, 1:39 AM)

streamview
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Feb 28, 2018, 1:40 AM

Post #8 of 10 (4064 views)
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Re: [jts1957] looking for power supply schematic [In reply to]	Can't Post

I tried it too , plugged cable from main board too CNM803 and I applied 3.2 V external , and tv didnt turn on and no back light.

jts1957
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Feb 28, 2018, 1:51 AM

Post #9 of 10 (4062 views)
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Re: [streamview] looking for power supply schematic [In reply to]	Can't Post

If your model is one that Samsung decreed would fire up backlights when Main board was unplugged, then you have a bad Power Supply. Although how set could work normally 20% of the time earlier beats me.

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Location: Far, Far Away

(This post was edited by jts1957 on Feb 28, 2018, 1:52 AM)

streamview
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Feb 28, 2018, 11:53 AM

Post #10 of 10 (4056 views)
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Re: [jts1957] looking for power supply schematic [In reply to]	Can't Post

sometimes from first ON ( apply power ) it turns on and stay on , the moment I shut off, then it can not turn on anymore . I have to turn on off many times untill it works again.

I hope someone here will find the schematic . its easier to troubleshoot. otherwise i have to spend 2 hours drawing it.

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