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Last edited by nomoresonys; 07-26-2019, 10:42 AM. -
Re: Need help with Samsung LN40E550f7f
Do test on post 180.Comment
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Re: Need help with Samsung LN40E550f7f
when i hit the power BLU_ON goes to 5.16v and drops to 5.14 and is steady at 5.14v.Comment
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Re: Need help with Samsung LN40E550f7f
Just a flash for a split second but i can see they are all coming on.Comment
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Re: Need help with Samsung LN40E550f7f
BLU_ON reads 0.00 before i hit the power button.Comment
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Re: Need help with Samsung LN40E550f7f
Ok, looks like we're back to powerboard, unhook inverter board/s from powerboard, have cable from powerboard to mainboard in place, see if you have around 400 steady at the filter caps when you hit power, be CAREFUL 400 volts can kill.Last edited by nomoresonys; 07-26-2019, 10:55 AM.Comment
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Re: Need help with Samsung LN40E550f7f
with inverter unplugged and main board plugged in the main filters go to 439 DCV then drops to 147 DCV.Comment
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Re: Need help with Samsung LN40E550f7f
Ok, looks like we have confirmed the problem is on powerboard.Comment
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Re: Need help with Samsung LN40E550f7f
Check the diodes.Comment
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Re: Need help with Samsung LN40E550f7f
Any ideal? we have all the low voltage.Comment
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Re: Need help with Samsung LN40E550f7f
I have the are all showing good.Comment
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Re: Need help with Samsung LN40E550f7f
I suspect the little blue cap by the filter caps, think it's CP820 or sum such number.Comment
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Re: Need help with Samsung LN40E550f7f
yes, it is CP820 i will change it and let you know.Comment
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Re: Need help with Samsung LN40E550f7f
One way of testing caps without a cap meter: To test the capacitor with a multimeter, set the meter to read in the high ohms range, somewhere above 10k and 1m ohms. Touch the meter leads to the corresponding leads on the capacitor, red to positive and black to negative. The meter should start at zero and then moving slowly toward infinity.Comment
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Re: Need help with Samsung LN40E550f7f
I replaced CP820 and CP804 did no change anything.Comment
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Re: Need help with Samsung LN40E550f7f
Ok, at least it's good to have them off the suspect list.Comment
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Re: Need help with Samsung LN40E550f7f
Thinking it must be in the pfc area, can you check the other components, check anything labeled with second letter P.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hey everyone,
This power supply board is hard to find but there are repair kits available. This board had a blown fuse, FP801S, blown PFC MOSFET, QP802CS and ceramic cap, CP809. I replaced them with parts I already had and tested the rest of the parts that would've come in the repair kit and they were fine. I powered the board up on the bench expecting, in typical Samsung power supply board fashion, to see all my output voltages but, nothing. 0 volts on CNL801, CNM801 and CNT801. The only thing I have is 170vdc on the filter caps. No standby voltage either.
Anybody... -
I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
I hope this is the right forum to post in despite not technically being a repair, but still a question of swapping boards.
I thought I'd explore the possibility to upgrade an existing working Samsung ue55nu7096u with the logic board (and power board if needed) of a newer model (ue55ru7105k) of the same size and appearance (and resolution). The reason being I'd like the extra inputs of that board including component in, an extra HDMI port and bluetooth. Its panel is broken so I have no use for the board otherwise.
The models launched in 2018 and 2019 respectively....
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