Re: Galaxy tab SM-T510 tablet - no lcd voltage

I looked at the schematic and found the [B]G3D_PWR_EN[/B] line and it is [B]LOW[/B] all the time.
State changes to [B]HIGH[/B] when holding down the power button.

If I keep the POWER button pressed, we have whole time HIGH signal and it immediately returns to 0.00V when I release it.

[B]And indeed it is as you wrote [/B]
[B]a HIGH state on this line activates GPU power supply.[/B]Re: Galaxy tab SM-T510 tablet - no lcd voltage

I looked at the schematic and found the [B]G3D_PWR_EN[/B]...

Re: Galaxy tab SM-T510 tablet - no lcd voltage

Honestly I have no idea what to do here.
This data bus goes directly to the processor and it simply does not control it. It is not shorted to VCC or GND. Resistances are fine.

I'm just wondering if this line should actually work. According to the datasheet of the display, a HIGH signal should appear on its [B]RESET[/B] line.
In my case, it is constantly down, i.e. the electronics of the display are kept in a reset state all the time.
In addition, the main PMIC has no voltage on the L5005 coil most...

Re: Galaxy tab SM-T510 tablet - no lcd voltage

Each of the MIPI lines has continuity to the lcd.
The values are around [B]0.0012[/B].
I checked all the way up to the filters, so we can rule out their failure.
As for the value relative to GND, each of them has values around [B]0.1100[/B] (none below 0.1050)

There is no signal on the [B]LCD_MIPI_CLK[/B] bus, but the problem occurs on both signal rails. There is small voltage on them and nothing else.Re: Galaxy tab SM-T510 tablet - no lcd voltage

Each of the MIPI lines has continuity...

Re: Galaxy tab SM-T510 tablet - no lcd voltage

There are two separate enable lines. One of them is responsible for turning on the [B]U7000[/B] responsible for +1.8V.
The second is used to activate the [B]U7001[/B] chip, which generates
[B]VDD_LCD_5P8_P[/B] and [B]VDD_LCD_5P8_N[/B].

As for the lcd detection, I see a [B]CON_DET[/B] line with a pullup resistor.
I checked it and it seems to work (measured on the test point next to the processor)

There is correct communication on the lines [B]TSP_SCL[/B] and [B]TSP_SDA[/B].
...

Hi,
I have a problem with Samsung Galaxy Tab A 10.1 2019 SM-T510 tablet.

The problem is a complete lack of voltage on the LCD.
Display has no backlight and no data (as if it was not connected to the device at all).
Tablet appears to be booting up.
Processor and memory are getting warm.
When I plug in the charger I hear sound from the speakers.
Device appears in the windows device manager (without any errors).


The enable signals for switching on all sections of the LCD power supply appear only for about 200ms. Both...

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Hello everyone