Hi everyone, I have a problem with a Samsung TV model UE50NU7400, I don't have the stanby LED, on the power supply board after a first check I found the fuse blown, and the 2 KF7N50 transistors on the primary power supply both short circuited, I replaced the fuse and the 2 transistors, now the short circuit has disappeared but I still don't have the LED off, do you have any suggestions?
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Hi everyone, I have a problem with a Samsung TV model UE50NU7400, I don't have the stanby LED, on the power supply board after a first check I found the fuse blown, and the 2 KF7N50 transistors on the primary power supply both short circuited, I replaced the fuse and the 2 transistors, now the short circuit has disappeared but I still don't have the LED off, do you have any suggestions?
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Hello, as I mentioned in the title, I have a Samsung TV at home, model UE40MU6405U, which is about 5 or 6 years old.
After a power company failure, the TV stopped turning on and even the standby light wouldn't come on. Over a period of about 10 seconds, the electricity kept going off and on repeatedly, and the TV died.
The power supply is: L40E6_KSM (BN44-00875A)
The main board: BN41-02568B
The power supply board seems to be fine. All the voltages are present. If I disconnect it from the main board, I get backlight.
I've also checked the... -
Hey everyone - I have a Samsung UN58J5190 with these symptoms: Does not power on, has standby light, standby light blinks 5 times after pressing "power on." When plugged in the power supply is making a very faint ticking sound, and this goes away when pressing power on.
Following instructions from the great team here in recent posts for Samsung with similar symptoms, I did the following tests:
I tested with mainboard disconnected from power supply - backlights do not come on (symptoms no change/5 red blinks)
I tested with T-Con disconnected... -
Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
Hello, I have a Samsung UN50EH5300 in my possession that I'm looking to bring back to life.
Symptoms:- - no power
- - no standby LED
What I've done so far:
- confirmed power supply is OK
-- CN201 #4 showing 5.3V
-- BD207 showing 5.3V
-- removing the cable between the main board and the power board turns on the backlight.
Pushing the power button on results in no change to any of the pins connecting the two boards.
- function assembly appears to be NO GOOD
-- there is no voltage showing on any of... -
By inserting power, on the diodes DM856...Dm859, there are 9 volts, when you press the power button the voltage is 12 volts, voltage present for a few seconds, then returns to 9 volts
The power LED remains off, always.
Reprogrammed Ic 503 = 25Q40 and IC 501 = 25Q80, downloaded from the site
The situation remained the same
https://**************/dump/lcd_pdp_...oogle_vignette...