Hi
I need advise about this image, should be a bad panel?.
The TV do not have sound.
I need advise about this image, should be a bad panel?.
The TV do not have sound.
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Re: Samsung PN42B450B1D Bad Panel?
Unlikely - looks more like Y-buffer fault, or control board issue.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: Samsung PN42B450B1D Bad Panel?
How can I troubleshot this problem?Comment
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Re: Samsung PN42B450B1D Bad Panel?
It's a tricky one; do you have a digital multimeter available? What about an oscilloscope? Take some pictures of the boards in the set.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Samsung PN42B450B1D Bad Panel?
I have a digital multimeter and the service manualAttached FilesComment
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Re: Samsung PN42B450B1D Bad Panel?
There should be some info on this in the service manual, but basically on the logic main board in the 5th image, there is a group of 4 pins. By placing a jumper on pins 3-4 and disconnecting the ribbon between the logic and main boards then powering on the set you can access a built in self test to try and isolate the main board as the problem.
Edit: see the 2nd post from tom in this link- https://www.badcaps.net/forum/showthread.php?t=26790
If the test results in full screen colors and patterns then the problem is your main board - and the logic, y-main and panel are ok.
If the test fails then I'm afraid I'm not sure. But you shouldn't be any worse off than where you are now by trying this.
In any case, do a quick search and check of the manual before attempting this. If your set powers on ok from the power button then you can skip the parts about jumping the PS_ON signal on the power supply and just disconnect the ribbon between the logic and main boards and use the power button on the remote.
Since you have no sound either and the speakers appear to be connected directly to the main board, i would guess the main board.
- but tom knows far more about these things than i do and has helped alot of folks around the world have success fixing their tv, so i would probably listen to him instead of myself! :-)
I'm a rookie but am yet to see a y-main take out the sound with it even on models that do run sound via the y-main. Not saying it can't happen though.
For a new main board I'd keep an eye on wePay or SJ, and make sure ALL the numbers match, or cracked screen tv of exactly the same model to salvage from. Provided you don't overpay or damage anything then even if that's not the problem you should be able to re-list it for near enough to the same price you paid and not get left out of pocket too much for trying.
Just my 2c.
DD.Comment
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Re: Samsung PN42B450B1D Bad Panel?
This was the self test result: see the pictureAttached FilesComment
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Re: Samsung PN42B450B1D Bad Panel?
I would replace the control/logic board (the one with the 4 pins) and see what it looks like when you do that. It is very hard to be sure but I think it is driving the plasma panel wrong and causing this issue.Last edited by tom66; 11-07-2014, 12:48 PM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Samsung PN42B450B1D Bad Panel?
Strange result.
I'm not sure sorry, but it was worth a try :-)
Edit: I was too slow!
Sorry I can't be of more help,
DD.Comment
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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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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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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.... -
Well, I will be the first to admit that I screwed up...
In attempting to replace the backlight in a UN65TU8000, I made a hole through one of the ribbon cables between the board that runs along the bottom of the back of the TV and the panel. This lead to a between a 1/4 to 1/2 inch vertical stripe running the full height of the image.
I don't have the experience; personally, to solder a bridging wire for the paths that were cut. So, I have been on the hunt for other Samsung TV's of similar size.
I have 2 that I have found and have in my possession. ... -
I came across a 50inch TU8000 that wouldnt start up properly (blinking stand-by light, backlights would cycle on and off).
When i opened it up and removed the power to the mainboard the backlights powered up and everything looked uniform.
When reconnected the mainboard but disconnected the flex cable to the panel i heard the TV startup with the intro sound.
Later I checked for shorts on the panel PCB boards but could not find anything.
When I took a look with the FLIR i noticed the 2 resistors...
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