Re: Samsung UE49KS7000SXXH - No standby light
can you trace that diode back? the dark green is the trace, see what it leads to.
can you trace that diode back? the dark green is the trace, see what it leads to.
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Re: Samsung UE49KS7000SXXH - No standby light
maybe check those 2 transistors on that heatsink.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
I'm looking at a picture of a similar board but it isn't very clear to see, not focused.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
.Last edited by nomoresonys; 07-28-2022, 10:52 AM.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
Image of the board.. if something is causing diode to get shorted, do we need to look before diode or after?
That diode and one next to it (second adn third diode) are connected to the transformer pin. I guess that in the middle is the transformer? Another two diodes are connected to the oppsoite transformer pinAttached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by B0r1s; 07-28-2022, 11:00 AM.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
looks like it feeds to CM891, maybe check that cap.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
you were getting 390 at the big cap, I think that means the transformer is ok.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
a diode that failed from reverse voltage in excess of the breakdown voltage of the diode will tend to fail to a short, while one that failed from excessive forward current leading to overheating will tend to fail open, but that is not guaranteed.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
So short can happen if 60+ voltage (SB560 is 60v) come to the cathode (-) of the diode?Last edited by B0r1s; 07-28-2022, 12:21 PM.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
yes I believe so.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
in many cases fluctuating voltages have to do with faulty caps, did you check that cap relating to that diode?Comment
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Re: Samsung UE49KS7000SXXH - No standby light
check sa803 and sa805 and dm801, dm803.Last edited by nomoresonys; 07-28-2022, 12:56 PM.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
All 4 caps are on the shorted diode path, plus sign of caps are on that line.
What to test on it? Voltage or? I need to solder diode back before testing it with power on?Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Samsung UE49KS7000SXXH - No standby light
hell I would just check all the resistors, there's a handy chart, just google resistor chart or sum such.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
I think just start with resistance check, ohm mode, tv UNPLUGGED from power, check all 4.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
from what I understand, it isn't a good idea to power on a tv with any diodes out of place.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
some use a dim bulb tester, it helps to save parts from blowing up or shorting out, easy to make, lots of how tos on youtube.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
I'm facing a repair that has the same exact description, did you ever find out what was wrong?Comment
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Re: Samsung UE49KS7000SXXH - No standby light
Yes, one of the connections from big transformator in the centre of the board was broken i guess. I removed solder from all these connections and added new solder at these spots, and it's working after that. There is a video on youtube, some guy fixed his samsung tv with reflowing these spots but cant find it now.Comment
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Re: Samsung UE49KS7000SXXH - No standby light
So you couldn't be bothered to come back and type a sentence that you fixed it by reflowing the solder joints, you are no more important than the rest of us, right?Comment
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TV: Samsung QLED QE65Q7FNAT
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... -
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.... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
I had a Dead Samsung UN65MU6300FXZA with Mainboard BN94-12440E
Dead / No Power / No Standby Light results after power company had three
consecutive power outages on/off/on/off/on/off after which TV was rendered unresponsive.
After exploring the issue found Mainboard was the fault. Then with research on this site determined IC1604 was the suspect. The IC1604 is a surface mounted device (SMD) EEPROM, Winbond Model 25Q40CLSIP. A read on this EEPROM came back with all FF FF FF FF FF in all registers blank and empty of data. I had a spare mainboard with intact IC1604 and utilized...
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