Hi.Motherboard is DV6 UT35UMADDR3. There was water damage so i checked and found out that PU5 and PQ4 was burnt so i replaced both and laptop is now working.The problem now is that the moment battery or adaptor is inserted the touch panel lights up together with HDD LED(amber light) without power switch being pressed, but the screen stays dark.(I noticed that the screen lights up together with panel and HDD LED when SPI EEPROM is removed from the board but when SPI EEPROM is on board the screen stays dark).I have cleaned the whole board with solvent.The board powers up fine but when it is powered off the panel LEDs and HDD LED (amber light) stay on which drains battery.Any help will be appreciated.Thanks.
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I am trying to convert a HP EliteBook 840 G7 notebook from a non-touch to a touchscreen. I purchased a complete touch LCD assembly with a screen/back cover/bezel/video cable and swapped it out with the original non-touch LCD assembly.
The screen works but the touch does not. I know the new LCD assembly is completely functional because we tried it on a similar touchscreen EliteBook 840 G7 and the touch works there.
I contacted the seller and he said screen conversion like this will not work due some difference in the motherboard for non-touch and touch capable EliteBook 840 G7.
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Hello,
I have a question that's driving me a bit nuts recently.
Is the touch board on Surface Pro 4/5 somehow married to the motherboard? I have a few Surfaces that, after the touch board change, lost all touch functionality.
- I tried flashing the bios (simple ME clean from a known good bios, previous bios didn't have an intergrated hub enabled), reinstalling firmware, reinstalling windows and even new touch boards.
- In one instance, after I tried to troubleshoot by using a known good screen + touch pcb combo on a Surface that lost touch, the touch board... -
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 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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