Re: Samsung ue324h5000w no backlight
after changing 2S110 now 318v in main cap
after changing 2S110 now 318v in main cap
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Re: Samsung ue324h5000w no backlight
How did you verify the 4 led strips?Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
OK WITH Lab Mains Adapter BT305
IN EACH STRIP I give 30v 0.30 ampComment
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Re: Samsung ue324h5000w no backlight
Any idea ,???????????????????Comment
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Re: Samsung ue324h5000w no backlight
So the 4 strips tested at 30V, 300mA per strip would appear to show the leds are fine. The board says 140V @ 260mA. With 4 strips in series would be about right.
without the schematic for the power supply it is difficult know what else to check.
However the Backlight On and P_Dim should not be 0V and you already said that with the main board disconnected and connecting A5 to BL_ON using a 1K resistor and A5 to P_Dim again using a second 1K resistor did not bring the leds on.
What voltage do you have on each side of D9101Last edited by dick_barton; 02-18-2017, 03:30 PM.Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
What DCV do you have between GND and the Cathode (band) of DM852? That Voltage (low Voltage) is the feeding Voltage that feed the Boost converter circuit to produce the 140VDC for the LED.
I expect to see that feeding Voltage (low Voltage) to be present at all time.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 ue324h5000w no backlight
voltage on each side of D9101 -----------0.00V
voltage oN DM852------------60VComment
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Re: Samsung ue324h5000w no backlight
What's the IC part number as printed on it.Attached Filesif you find these attachements useful please consider making a small donation to the site
Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
may be SLK2012M IM NOT SURE I CANT READComment
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Re: Samsung ue324h5000w no backlight
Cannot find anything on that number but could find SLC2012M listed as a power supply drive control ICWilling to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
The IC looks very much like a FAN7340 in layout. Can you measure very carefully what DC voltages you have on the pins 1 - 16 with the black meter lead connected to pin 3.
http://pdf1.alldatasheet.com/datashe...D/FAN7340.htmlAttached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by dick_barton; 02-19-2017, 09:41 AM.Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
What's the part number and what voltages do you have on the 3 pins?Attached Filesif you find these attachements useful please consider making a small donation to the site
Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
Gnd is 4 leg
1. 12 .8 v
2. 105 mv
3. 105 mv
4. Gnd
5. 4 .8 v
6. 120 mv
7. 86 mv
8. 105 mv
9. ~4 v
10. 3.5 v
11. Nc
12. 100 mv
13. 105 mv
14. 93 mv
15. 0.77 v
16. 87 mvAttached Filesif you find these attachements useful please consider making a small donation to the site
Comment
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Re: Samsung ue324h5000w no backlight
Good find.Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
MDD5N40 N-Channel MOSFET
D 124V
G 0V
S 0VComment
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Re: Samsung ue324h5000w no backlight
Here's a Samsung model using the same LED driver giving voltages.
So you have your 120V for driving the leds. What voltage on pin 11? It's pin 10 that's NC.
Looking like the led driver is faulty since there does not appear to be any drive voltage to the mosfet.Attached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by dick_barton; 02-19-2017, 10:55 AM.Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
Just taken another look at the information you provided.
If the drain of the mosfet is at 124V then that should pass through a diode and arrive at CNL802.
Can you confirm the 124V is on pins "Top1-"Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
BIG THANKS TO dick_barton
After changing SLC2012M the backlight is comingComment
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Re: Samsung ue324h5000w no backlight
Thank God. I though we would never get there.Willing to help but I'm no expert.Comment
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Re: Samsung ue324h5000w no backlight
hhh me tooComment
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This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...09-07-2024, 05:50 AM
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Hi everyone!
Hope you're all having a great day, and thank you very much for stopping by and taking the time to read this post to help me with my parents' Samsung TV.
My issue: No backlight.
Model: QE82Q70RAT
Type No: QE82Q70RAT
The TV was already serviced by Samsung once under warranty for the exact same issue, but six months after the fix, the backlight went out again. Now, Samsung is asking for nearly the same price as a brand new TV to fix this with the same 6-month guarantee.
So hopefully, I can fix this cheaper.
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TV was fixed just after removing Samsung's rear snap cover.
This curved TV's construction is rather interesting. When the snapped on back is removed, rest of the TV will relax the curvature. Top of LCD panel is loose as it wants to straighten out against the slightly curved bezel. Snapped back provide most of the curvature shape. So just simple disassembly of rear cover will allow the rest of the TV frame to relax its curvature. Thats probably what fixed it but no idea which connection. 4x LEDs are edge lit.
Maybe PSU->backlight connector didn't have a good contact?... -
- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
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Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged...
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