Acer E5-574G sin señal de video

Hello, good afternoon!
I have an Acer E5-574G with DA0ZRWMB6G0 motherboard, which initially arrived with a short on the VIN line caused by the CHIP PU7 (AOZ5029QI-5).
After replacing PU7, the short has disappeared, and when I press power on, the laptop stays on but does not send a signal to the screen, nor to external VGA. The keyboard doesn't respond either. The LCD screen does a tone change but there is no backlight and no picture.
I have checked the voltages on pages 43-46, all voltages being present.
The value of +VCCGT, generated in PU7 and PU6, leaves me in doubt. There is a voltage of 0.66V. Is it correct or is it low?
If someone can help me I would be grateful
Greetings

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Hola buenas tardes!
Tengo un Acer E5-574G con placa base DA0ZRWMB6G0, el cual inicialmente llegó con un corto en la linea VIN provocado por el CHIP PU7 (AOZ5029QI-5).
Tras sustituir PU7, el corto ha desaparecido, y al pulsar power on, el portátil se mantiene encendido pero no manda señal ni a pantalla, ni tampoco a VGA externo. El teclado tampoco responde. La pantalla LCD hace un cambio de tono pero no hay etroiluminación ni imagen.
He comprobado los voltajes de las paginas 43-46, estando todos los voltajes presentes.
Me deja la duda el valor de +VCCGT, generado en PU7 y PU6. Hay una tensión de 0,66V. ¿Es correcto o es bajo?
Si alguien me puede ayudar estaría agradecido
Saludos

Can someone confirm the value of +VCCGT for this laptop?

Holding down Fn + Esc, and then pressing power, it seems to enter BIOS Recovery mode, and the blue led starts flashing.
I have unzipped the BIOS file downloaded from the official website, and I have copied the contents of that file to a pen. When I turn on the laptop keeping the keys pressed, I see that for a moment there is a reading on the usb, but later it stops, and the blue led is already fixed.
Should the pen be Bootable or should it just contain the BIOS file?

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¿Puede alguien confirmar el valor de +VCCGT para este portátil?

Manteniendo pulsado Fn + Esc, y posteriormente pulsando power, parece que entra en el modo BIOS Recovery, y el led azul comienza a parpadear.
He descomprimido el archivo BIOS descargado desde la Web oficial, y he copiado el contenido de ese archivo a un pen. Cuando enciendo el portatil manteniendo las teclas pulsadas, veo que por un momento hay lectura en el usb, pero posteriormente se detiene, y el led azul se queda ya fijo.
¿El pen debe ser Bootable o solo debe contener el archivo BIOS?

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Hello!

The voltage "+VCCGT" seems a bit low.

Measure the power consumption (in mA) of the board before and after pressing to the power button.

Hello. First of all thank you very much for answering and trying to help me.
With everything connected except the hard drive, the consumption is 250mA.
After pressing the power button the consumption is 900 mA

With the battery and the hard disk disconnected, the consumption is 0.01A and after pressing on the consumption is 0.50A - 0.65A

P.D. There is a new problem. With so many tests and measurements, I have started again from the beginning, and now, again +VCCGT is not present. It is at 0V.
I have checked and in VIN there is 19V, in PWM2_B I have 2.65V, but in FCCM_B I have 0V.
I'll investigate
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Hola. Ante todo muchas gracias por responder e intentar ayudarme.
Con todo conectado excepto disco duro el consumo es de 250mA.
Tras pulsar el botón de encendido el consumo es de 900 mA

Con la batería y el disco duro desconectado, el consumo es 0,01A y después de pulsar encendido el consumo es 0,50A - 0,65A

P.D. Hay un nuevo problema. Con tantas pruebas y mediciones, he vuelto a empezar desde el principio, y ahora, nuevamente +VCCGT no esta presente. Esta en 0V.
He comprobado y en VIN estan los 19V, en PWM2_B tengo 2,65V, pero en FCCM_B tengo 0V.
Voy a investigar

Zemog napisał(a):but in FCCM_B I have 0V.

Measure the resistance to ground on line "FCCM_B".
If the resistance is high (in kΩ range or greater), try to replace the controller chip PU1 (ISL95859HRTZ).

The resistance with respect to ground in FCCM_B, is 2 Mohm, placing positive in FCCM_B and negative in GND
I guess you have to replace PU1, right?

P.D. I just ordered the chip because I don't have it in stock and I don't have any scrap motherboard with that same chip. As soon as I receive it and replace it, I'll let you know.
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La resistencia con respecto a masa en FCCM_B, es de 2 Mohm, colocando positivo en FCCM_B y negativo en GND
Supongo hay que sustituir PU1, no?

P.D. Acabo de realizar el pedido del chip porque no lo tengo en stock y no tengo ninguna placa base de desguace con ese mismo chip. En cuanto lo reciba y lo sustituya, comento.

This fault has me a little crazy.
After checking that +VCCGT was not present (FCCM_B absent), I also checked that +VCCCore was also not present (0 V).

The next day, when I return to the measurements after disassembling and assembling everything again, it returns to the way it was at the beginning.
+VCCGT .. 0.65V
+VCCCORE .... 0.85V
I had to replace PU6, because like PU7 it was shorted. I don't know if PU1 voltages being present can be ruled out.

Now that the voltages are present.

With everything connected, including the hard drive, the consumption at rest is 1.15A and charging the battery. After pressing the power button, the consumption rises first to 1.85A, then to 2.00A, and finally remains between 1.85A and 1.95A but stable.

With battery and hard disk disconnected, at rest the consumption is 0A, and after pressing the power button the equipment does not turn on, although on other occasions it has done so with the battery disconnected.
The voltage on PR213 (VIN) is very unstable 3.65 to 4V, when there should be 19V.

If I connect the battery again, in PR213 I have stable 18.6V again and the equipment responds to the power button

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Esta averia me tiene un poco loco.
Después de comprobar que +VCCGT no estaba presente (FCCM_B ausente), también comprobé que +VCCCore tampoco estaba presente (0 V).

Al dia siguiente, cuando retomo las mediciones tras desmontar y montar todo nuevamente, vuelve a estar como al principio.
+VCCGT .. 0,65V
+VCCCORE .... 0,85V
He tenido que sustituir PU6, pues al igual que PU7 se puso en corto. No se si al estar presente los voltajes PU1 puede ser descartado.

Ahora que los voltajes estan presentes.

Con todo conectado, incluido disco duro, el consumo en reposo es 1,15A y cargando bateria. Tras pulsar boton de encendido el consumo sube primero a 1,85A, después a 2,00A, y finalmente se mantiene entre 1,85A y 1,95A pero estable.

Con bateria y disco duro desconectado, en reposo el consumo es 0A, y tras pulsar boton de encendido el equipo no enciende, aunque en otras ocasiones si lo ha hecho con la bateria desconectada.
El voltaje en PR213 (VIN) es 3,65 a 4V muy inestable, cuando debería haber 19V.

Si conecto batería nuevamente, en PR213 tengo 18,6V estables nuevamente y el equipo responde al boton de encendido

Zemog napisał(a):With battery and hard disk disconnected, at rest the consumption is 0A, and after pressing the power button the equipment does not turn on, although on other occasions it has done so with the battery disconnected.
The voltage on PR213 (VIN) is very unstable 3.65 to 4V, when there should be 19V.

If I connect the battery again, in PR213 I have stable 18.6V again and the equipment responds to the power button

That's completely normal. This board is a bit unusual and doesn't work without battery connected.

Replace the controller chip PU1 (ISL95859HRTZ) as already suggested.

After a while waiting for the ISL95859HRTZ (PU1), they have finally arrived.
I have replaced it, but the situation has worsened. After changing I have no voltage, or there is voltage but very low in:

+1.05V_GFX ... 0V
+3V_GFX .... 0.34V
+VGPU_CORE, +1.5V_GFX, +VCCCORE, +VCCGT, all also with 0V

I have checked all the welds on PU1 and they all seem fine.
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Despues de un tiempo esperando el ISL95859HRTZ (PU1), por fin me han llegado.
Lo he sustituido, pero la situacion ha empeorado. Después de cambiar no tengo voltaje, o hay voltaje pero muy bajo en:

+1.05V_GFX ... 0V
+3V_GFX .... 0,34V
+VGPU_CORE, +1.5V_GFX, +VCCCORE, +VCCGT, todos también con 0V

He revisado todas las soldaduras del PU1 y todas parecen estar bien

Zemog napisał(a):After a while waiting for the ISL95859HRTZ (PU1), they have finally arrived.
I have replaced it, but the situation has worsened.

Check, if the markings on the new chip are correct (95859 HRTZ).
If so, solder the old (original) chip back to the board and check, if the issue returns to the previous state.