acer an515 la-191pr1a

[yaso143]

Hello if anyone can help im currently working on a acer nitro 5 no display but the capslock responds when you turn on the device

here is my measurement
+INVPWR_B+ 19v
PCH_BKL_PWM 0v
EC_BKOFF# 0v
EDP_HPD_R 2.4v
+LCDVDD 3.3v
PANEL_OD_EN .754v

I also checked the lid sw# it works just fine the voltage with out the magnet is 3.3v and drops down to 0 when magnet is engaged
Ialso used a known good lcd but still no display

[yaso143]

up

[mon2]

https://forum.sorinelectronics.com/i...hp?topic=476.0

[yaso143]

ive read this thread seems like its a processing issue the device is not responding . mine does
This two voltages is my main concern on that thread one guy said that this must have voltage how can i confirm that the echip is not corrupted or defective?

PCH_BKL_PWM 0v
EC_BKOFF# 0v

[mon2]

No direct experience on this but have seen many corrupt bioses on the motherboard. Suggest to go into the dedicated bios forum to hunt for and/or request a bios dump for the EC on this logic board. The dumps as far as I know are not unique with serial numbers for the EC component. The EC is often an 8051 or Cortex ARM processor and this local bios is the firmware for that device to offer support of your keyboard, etc. It is a vital component. Do update this thread so we can continue to debug and learn from your case.

Confirm that the voltage rails & clock are present for your EC. If available to you, monitor the I2C / SMBUS lines for activity. Respectively, do the same for the local bios. Do you see any pulsing of the bios? Is the bios powered? Is there a local clock to the EC? Sometimes the clock / crystal are found to be defective. Without a clock, nothing will move forward.

Review that the EC and the flash device are being powered with a stable voltage. On the flash device, this is a SPI interface (usually). For SPI and I2C / SMBUS interfaces, there is always a local clock driven by the bus master. The bus master is the EC itself. If the EC is doing its job, the CLK line will pulse. Best to have a scope or even a low cost logic analyzer to study each.

[yaso143]

sorry im just still learning on this kinds of repair do ineed a ec flasher like svod ?

[mon2]

It will depend on the EC. The svod tool is used to interface with EC devices where the flash is internal to the component. If the flash device is external, then you can use any programmer that offers support for that external flash device / package / company brand and series. Some EC controllers are programmable while others are not. When they are not programmable, they are booted by another host like the PCH / CPU on the board which treats the EC as a slave device with an address. Using this address mode, the ec device can be boot strapped with its firmware.

[yaso143]

thanks for the advice unfortunately idont have the right tools to fix this at the moment