Before I pull the board out and toss the panel. Just want to make sure.
I thinking it has a bad panel. Does it on HDMI and when In menu screen.
I thinking it has a bad panel. Does it on HDMI and when In menu screen.
Attached Files
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Re: Dynex dx-lcd37 bad panel??
Solarized pictures, check the GAMMA Voltages on the T-CON board, reseat the cable to the T-CON, etc,
Pictures of the T-CON board and the whole back side of the TV?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=24809 -
Re: Dynex dx-lcd37 bad panel??
Going to see if i can check gamma volts.Attached FilesComment
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Re: Dynex dx-lcd37 bad panel??
Yep, another AUOPTO T-CON with bad AS15 GAMMA IC.
http://www.shopjimmy.com/auo-55-37t0...-con-board.htmNever 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: Dynex dx-lcd37 bad panel??
I already know what the outcome of those voltage tests will be
BAD! lolComment
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Re: Dynex dx-lcd37 bad panel??
Vgamma 1 _15.56v
Vgamma 2 _15.47v
Vgamma 3 _13.61v
Vgamma 4 _12.40v
5 _11.52v
6 _10.90v
7 _10.53v
8 _10.22v
9 _9.93v
10 _7.54v
11 _7.35v
12 _6.84v
13 _14.39v
14 _1.753v
15 _2.970v
16 _4.165v
17 _3.989v
18 _3.545v
19 _3.098v
20 _2.424v
21 _0.628v
22 _0.308v
Ok I know the voltage starts high then goes low. but 14v in the middle. Maybe a bad T-con boardComment
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Re: Dynex dx-lcd37 bad panel??
Yeah the AS15 is shotComment
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Re: Dynex dx-lcd37 bad panel??
Just ordered the AS15-F chip. Going to try to replace it. Tried once before on a different set and failed. So I got 5 this time.Comment
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Re: Dynex dx-lcd37 bad panel??
What soldering equipment do you have?Comment
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49UJ6500 LCD panel has a lighter band on top when first powered on. Goes away (or gets much fainter) after TV on for a few min. After powered off for awhile and power back on, same band appears. If powered on immediately after powering off, no or much fainter band. Running the latest firmware.
Disassembled the TV and lifted the LCD panel during testing. Band is on the LCD panel (can see the band on the panel as I lift it slightly) Backlight is perfectly even at the top edge. Double checked LCD panel alignment in the frame and is perfect but since band moved with the panel, its on... -
TV flashes backlight then reboots over and over. no image. Client said it used to have image for a bit before rebooting. Got worse over time.
tcon is built into mainboard.
Only one cable goes to panel boards.
there is a cable from one panel board to the other that links them.
cost cutting measure that results in us having harder time to diagnose.
removing the link to the second panel board allows TV to stay on with stable backlight but no image.
used cut off tape method to mask 1 maybe 2 pins on the side of the cable that goes to that second panel board.... -
I had a the above tv qn55q60r that had a bad panel but everything else good. I had another panel here from un55nu6900 with bad leds and melted diffusers.
I put the nu6900 panel in and powered it up and it does work but there are lines vertical lines.
I was trying to change the panel type in the service menu but don’t see my exact panel. Anyway to fix this or someone have similar experience.
the clear picture is the panel type from the service menus on the nu6900. The other 1 is the panel type that was set for the q60r with the bad panel....01-13-2024, 01:57 PM -
I have a TCL 55P6US with sound and backlight but no picture. This model does not have a T-CON board, and the right (rear perspective) panel board is fed from the left panel board. I have not been able to induce any change by disconnecting the secondary panel board or the tape cut-off method on the primary board.
There are a bunch of voltages missing on the panel boards. I can't find any shorted caps of the panel boards, and all of the missing voltage rails read in the kiloohms, which leads me to suspect the issue may lie on the circuit board, rather than a short in the panel.
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- 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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