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Hello,
I have a problem with an Asus X553MA motherboard. Sometimes the system works fine, but other times the CPU voltage drops to 0V. In most cases, the laptop reboots after a few seconds due to the voltage drop.
Occasionally, it shows the ASUS logo or boots into the BIOS. Sometimes it can stay in the BIOS for hours without issue.
I checked the board with a thermal camera, but I couldn't find any overheating or leaking capacitors.
Unfortunately, I don’t have access to the schematic.
It seems to me that when I bend the board, something changes.
Could this... -
Hi all,
I have a MBP A1398 EMC 2881 here, it chimes, boots and shows picture on external screen
there is an apple logo on the display, no backlit
I measured the PP3_G3H on the backlit fuse - it's 12.6V when not powered and it drops to 10.8V after startup.
Is this OK?
Also measured the LVDS connector pin 1, there is 0V, could that be the backlit driver chip?
Also checked all 4 "backlit" capacitors, all OK, not shorted.
Thank you very much,
-jp12-02-2024, 01:29 PM -
Folks, I have a Vizio flat screen that doesn't show any signs of life (and no orange vizio glow either).
I tested the voltages from the power board (at the connector) and I can see the 5V supply drops to 3V after the power cable is connected to the main board (5V supply reads as 5V when cable is disconnected from main board). All other rails (12V and 24V) are reading fine.
I looked for the usual bloated caps and saw none on either board and no other tell-tall signs (black marks, burned components, etc) on either side of both boards.
Given the 5V rail... -
I recently purchased a second hand RTX 2070 - an OEM Acer Predator manufactured by Sapphire - not a very common model.
Upon connecting it up I noticed the fan wasn't operating resulting in the card overheating and shutting down. I checked the fan operation independently by connecting it directly to a power supply and function generator - it was working correctly with variable speed according to the square wave frequency.
I then checked the output with a multimeter/DSO and verified that the GPU was putting out both 12V at pin 2 and PWM at pin 4. However, when the fan is... -
Do you have any idea what it could be? Thanks.
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