Re: Samsung Ln55b650t1f Part Identification
Thank you for your assistance, I will test the pins tomorrow. Just to be clear, you are wanting me to resolder the inductor onto the main board and test it the voltages with the unit powered off and on? The TV never really turns on, but the standby light will turn off for a couple seconds before going back to a black panel with standby light on.
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Re: Samsung Ln55b650t1f Part Identification
Also, what's the full service code number for this TV?
LN55B650T1Fxxx
Maybe LN55B650T1FXZA?Leave a comment:
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Re: Samsung Ln55b650t1f Part Identification
Can you get some good clear head on shots of the main board? Preferably in natural light - no flash.
Look at your meter. Turn it on and into resistance mode.- When you don't have the probes touching each other, what reading do you get? (OL or something similar).
- Touch the probes together -- what reading do you get now? (0.00 ohm, or something under 1 ohm is what we're looking for.).
If you get something in the ~10 ohm region, i'm assuming that you didn't break through the thin layer of oxidation on the probe. A good test is to get a piece of copper and lightly "jam" the tip into the copper for a good connection.
Anyway, back to your TV: the inductor should have 0 resistance (for the sake of this discussion). There are parasitic resistances for it in a "real inductor" vs an "ideal inductor" (quick google search will have some physics background for this)
Do you have a photo of the board before you removed the inductor?
I'm assuming the connector by the barcode goes to the power board.- Please post voltage readings with everything connected when the TV is OFF
- Post voltage readings with the TV is ON?
Make a table like this (example). Give the pin number. The signal name (as shown on the silk screen on the board), the OFF voltage, the ON voltage. Wrap it with the "code" block when you edit in "Go Advanced" mode to format it...
Code:Pin SIG V_OFF V_ON 1 PWR_ON 0 3.329 3 20V 0 21.26 5 GND 0 0 7 GND 0 0 9 3.5V 3.49 3.438 11 3.5V 3.49 3.438 13 GND 0 0
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Re: Samsung Ln55b650t1f Part Identification
I was always under the impression inductors should be between 1Ω-11Ω, is this not true? Are here any other methods to verify it is working properly?
1. Physically it appears to have two burned score marks on either side
2. All voltages on PSU looked good. TV has a standby light that will momentarily turn off for 2 seconds when the power button is pressed. No picture displays. Unplugging the Main from the PSU does turn on all the backlights, no issues there.Attached FilesLeave a comment:
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Re: Samsung Ln55b650t1f Part Identification
Your meter is in resistance (Ohm) mode. It says 0.00 Ohms.
An inductor should register as 0 Ohm (for all practical purposes). That inductor appears to be fine.
Your meter should read "OL" (open loop), or similar, when your probe tips have no connection - similar to the reading when you just have the two probes not connected to each other.
Lets back up a few steps:
1. What brought you to the conclusion the inductor is bad?
2. What was wrong with this main board?Last edited by ngth82; 04-11-2020, 11:08 AM.Leave a comment:
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Re: Samsung Ln55b650t1f Part Identification
The parts you cross referenced from digikey and mouser should be fine.
What's currently wrong with this inductor? Is it OPEN?
What's the DC resistance across the two pads?Leave a comment:
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Re: Samsung Ln55b650t1f Part Identification
The first inductor is a 4.7uH. What's the diameter of the part?
The first line indicates the value. The second line is likely the production date code / lot code.
Did this come off of the pads around the barcode label?Leave a comment:
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Re: Samsung Ln55b650t1f Part Identification
Here is the main board it came off ofAttached FilesLeave a comment:
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Samsung Ln55b650t1f Part Identification
This TV will display a standby light, but does not turn on. Light will turn off and on again if you press it.
Looking at the main board, this little inductor looks to be blown. It has markings of "4R7 941" on the top. Can somebody confirm for me if this is a compatible part?
DigiKey Part
Mouser PartAttached Files -
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I need to replace the pictured small (3x2 mm?) Samsung LED strip component. I traced it the entire length of the first section of the strip. I assume it provides the positive voltage for the 2nd, shorter, plugged part of the strip. It's the one labeled 24V and scribed with 4E. AJ. Ideas for replacements, thank you. -
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Thanx... -
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PSU: BN4400940A
MB: BN94-12832K
I got the tv in spring 2024. At that time it started, then ran 60 sec and poweroff. Seemed like reboot issue. I didn't have time and room to check it in summer so I plugged it in and now the standby light is on. I press button on remote, standby light goes off and tries to start?. No picture or backlight on LCD. I thought about removing diodes like in this thread: https://www.badcaps.net/forum/troubl...sung-qled-q60r... -
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I've got a problem with a Samsung UE60KS7000 that was given to me and said that there was a problem with the One Connect box but as I understand the TV should turn on even with the One Connect box disconnected (which it doesn't). There is no stand by light.
I've disconnected the Main Board from the PSU and when connecting to mains the backlight turns on which suggests the PSU might be ok. I've measured the voltages out of the PSU and they seem reasonable (like the labels say). The main board has no obvious burns, there are no shorts on the power rails anywhere....
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