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Re: Samsung LE40A558P3FXXU Colored lines
I have checked the 12VIN on the T-Con and am getting 12.4v is there any other voltage checks I need to carry out? does this mean the problem is forward of the T-con? thanksComment
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Re: Samsung LE40A558P3FXXU Colored lines
anybody know what I should be looking at next? thanksComment
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Re: Samsung LE40A558P3FXXU Colored lines
I would like help you but theese days i'm too busy and too hot in the room with the PC turned on..Comment
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Re: Samsung LE40A558P3FXXU Colored lines
Hi, I'm not sure of the purpose of your response? did you have any advice/help to give? I would really like to get this sorted out and don't want to just throw boards at it someone please let me know what I should be looking at/doing next, I've checked the T-con input and have 12.4V on the 12VIN test point
Thanks for all your help and understanding this level of tech testing is not my strong point though I do enjoy the feeling of getting something going again.Comment
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Re: Samsung LE40A558P3FXXU Colored lines
It's very simple, since i asked you photos but now it's not the right moment, if you can wait also better wheater , september or so..Comment
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Re: Samsung LE40A558P3FXXU Colored lines
In your first picture at post #20 it looks like there`s some sort of liquid residue,it could be flux, and i see a resistor thats not straight.Have you owned the TV from new or is it used/refurbished,have you had any previous repairs done to it.Comment
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Re: Samsung LE40A558P3FXXU Colored lines
Thanks for your response SMDFlea it's a used unit I got for my daughter a while ago that only recently started showing this issue no one has looked at it before me that I'm aware of which component are you referring to please?
I see it now R867, looking at the board several of these resistors are not straight R867,R850,R851,R278 there's quite a number of them so I've checked the 12VIN and got 12.4V does that mean the issue lies T-con forward then? component F1 is that going to be a fuse?Comment
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Re: Samsung LE40A558P3FXXU Colored lines
i found a good photo of the board, test in volt points VGH, VGL, V1D8, V2D5, V3D3, AVDD,; touch as15-f chip to feel too much heat..Comment
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Re: Samsung LE40A558P3FXXU Colored lines
Great what voltages should I be looking for?Comment
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Re: Samsung LE40A558P3FXXU Colored lines
you have only to write them here obviously, i tell you the rest..Comment
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Re: Samsung LE40A558P3FXXU Colored lines
I can't see the test points you are asking me to test, I can see lots of points VGMA1 through to VGMA22
I can see loads starting OX and EX
an LVDS_IN and LVDS_OUT
REF1 through to REF21
are we looking at the same board you do want me testing on the T_con?Comment
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Re: Samsung LE40A558P3FXXU Colored lines
found them all these are the results I got with the screen turned on
V1D8 1.8v
AVDD 15.66v
VGL 5.9v
VGH 21.5v
V3D3 3.3v
V2D5 2.48v
which chip is the as15-f please?Last edited by 24mech; 08-03-2020, 12:26 PM.Comment
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Re: Samsung LE40A558P3FXXU Colored lines
VGL must be negative, as15 is written on chipComment
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Re: Samsung LE40A558P3FXXU Colored lines
Your meter should show minus sign in front of the number being display on the meter for the VGL reading to indicating that the Voltage is negative polarity.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Samsung LE40A558P3FXXU Colored lines
the as15 ic will look like this in this video
https://www.youtube.com/watch?v=jf75hmjd6X8Comment
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Re: Samsung LE40A558P3FXXU Colored lines
It's obvious that if you have silicone bumpers you have to remove it, search the web for images with the TCON code, you'll find the picture with as-15 visible, check images from https://spares2repair.co.ukComment
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Re: Samsung LE40A558P3FXXU Colored lines
I rechecked the voltage at VGL - 5.9
I have removed the silicone bumper from as-15 after 5 mins of tv on its cold how long do I need to leave it on before testing?Comment
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After installing Linux, I can no longer enter the BIOS of my Samsung Series 9 (NP900X3C) laptop. When pressing [F2] during boot I simply get a black screen. Same thing when pressing [F10] and choosing "Setup" from the "App Menu" tab. Apparently this is a relatively common issue with Samsung laptops of that generation, but unfortunately i haven't been able to resolve the issue (yet).
Things i've tried so far; reinstalled Windows 10, checked for redundant boot entries, tried to factory reset using the emergency keyhole, attempted to clear the NVRAM by physically...08-01-2025, 09:15 AM -
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Hello,
I have a Samsung DM32D display.
When I try to power it on, the red LED blinks 5 times and nothing happens—the unit won’t start.
Here’s what I have tried so far:- Disconnected the cable between the mainboard and the power supply → the backlight turns on.
- Disconnected the main T-CON ribbon cable → same issue as before, the LED still blinks 5 times.
- Disconnected one of the two T-CON ribbons to the panel (tested each one separately) → same issue, the LED blinks 5 times.
From these tests, I suspect the problem might be on the mainboard. Could anyone...08-24-2025, 03:47 AM -
Hello,
I'm having an issue with the Samsung 740n's phase control setting. When I use the automatic adjustment, it sets the value to around 54 (with a range of 0-100), and the picture looks clear and sharp. However, after some time—like after playing a game—the text starts to look blurry. When I auto-adjust again, it may increase the value to 80, and everything becomes sharp once more. Yet, after a while, whether it's a few hours or a day later, the same blurriness returns, and I have to adjust it again.
I'm using the Samsung 740n monitor drivers instead of the default plug-and-play... -
Hello.
My TV is a QE65Q800TATXXC Samsung TV.
Issue : When you plug the 220V, voltages are OK on the power board and you can hear the click from the relay, but TV is not starting when power button is pressed. Red led is blinking when you press power button. But no images or sound ( Back-light is off )
Then if you disconnect the cable from the main board to the power supply, the TV back-light turns on.
Any ideas to check would be very appreciated 😊
After reading some posts on this forum, I suspect an eeprom issue so I bought a CH341A to dump...
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