Hello,
first of all, this is my first post, so I apologize for any errors in advance!
I have a Acer Aspire E5-773G lying around that died suddenly from one day to another.
First it would hardly post and get an image and shortly after it didn't post at all anymore. However, the CPU gets hot as soon as I turn it on.
The notebook turns on for half a second, off for 1-2 seconds and then on again by itself, keyboard backlight comes on, but no image at all. If I leave it on for a couple of minutes, it gets hot to the point where the fan begins to spin.
I bought the schematics and the boardview and since I have never ever EVER read any schematics on my own before, I was kinda lost, but found my way through.
What I've checked and did:
- 19V power rail from AC charger OK
- 5V power rail to USB ports OK
- 3.3V rail gets high as soon as the PC turns on
- 1D5V_VGA_S0 gets 1.53V as soon as on
- 1V_VGA_CORE_S0 gets 0.8V as soon as on
- Known working RAM
- Erased and then flashed BIOS chip with latest version, verified after (Unsoldered and flashed with an RPi and flashrom)
- U2402 pin PCH_PWROK gets 3.28V as soon as on
- U2402 pin SYS_PWROK gets 3.28V as soon as on
The only thing that I noticed that 1V_VCCGT has *almost* a short on my multimeter. Getting a DC-DC converter, adjusting it at 1V, soldering it on the 1V_VCCGT rail and powering it makes it consume 1.4A according to my multimeter. No element gets hot on the PCB, CPU gets only slightly warm. Heating the CPU up artificially with the heating gun increases the current draw to as high as 3.5A (relative to the temperature).
What led me to believe that 1V_VCCGT isn't the issue, was a thread on another forum from another Acer notebook that said that he had a short on this rail, but then followed up saying that he fixed it by reflashing the BIOS and changing the RAM.
Another curious thing is that 1V_VGA_CORE_S0 only gets 0.8V and get quite warm when the PC is "trying" to power up. The dedicated GPU does not get hot. In fact, I tapped the whole board with my hands and only the CPU and some inductors get warm.
I'm really out of ideas. If anyone has an idea, I would be very glad.
Thanks in advance!
first of all, this is my first post, so I apologize for any errors in advance!
I have a Acer Aspire E5-773G lying around that died suddenly from one day to another.
First it would hardly post and get an image and shortly after it didn't post at all anymore. However, the CPU gets hot as soon as I turn it on.
The notebook turns on for half a second, off for 1-2 seconds and then on again by itself, keyboard backlight comes on, but no image at all. If I leave it on for a couple of minutes, it gets hot to the point where the fan begins to spin.
I bought the schematics and the boardview and since I have never ever EVER read any schematics on my own before, I was kinda lost, but found my way through.
What I've checked and did:
- 19V power rail from AC charger OK
- 5V power rail to USB ports OK
- 3.3V rail gets high as soon as the PC turns on
- 1D5V_VGA_S0 gets 1.53V as soon as on
- 1V_VGA_CORE_S0 gets 0.8V as soon as on
- Known working RAM
- Erased and then flashed BIOS chip with latest version, verified after (Unsoldered and flashed with an RPi and flashrom)
- U2402 pin PCH_PWROK gets 3.28V as soon as on
- U2402 pin SYS_PWROK gets 3.28V as soon as on
The only thing that I noticed that 1V_VCCGT has *almost* a short on my multimeter. Getting a DC-DC converter, adjusting it at 1V, soldering it on the 1V_VCCGT rail and powering it makes it consume 1.4A according to my multimeter. No element gets hot on the PCB, CPU gets only slightly warm. Heating the CPU up artificially with the heating gun increases the current draw to as high as 3.5A (relative to the temperature).
What led me to believe that 1V_VCCGT isn't the issue, was a thread on another forum from another Acer notebook that said that he had a short on this rail, but then followed up saying that he fixed it by reflashing the BIOS and changing the RAM.
Another curious thing is that 1V_VGA_CORE_S0 only gets 0.8V and get quite warm when the PC is "trying" to power up. The dedicated GPU does not get hot. In fact, I tapped the whole board with my hands and only the CPU and some inductors get warm.
I'm really out of ideas. If anyone has an idea, I would be very glad.
Thanks in advance!
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