LG32LH20R 5V_STB Present but after pressing key1, RL_ON do not go low ...
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Hi guys,
I am currently trying to fix an atx psu which has 5v stb present, but doesn't turn on when shorting the pson wire to ground (I have tried with and without load), the pwm/supervisor is a est7502 (which I have replaced), I have checked every diode, every transistor and every cap and they all look fine (capacity wise, I don't have an esr meter yet), the only anomaly is the second voltage (is it called bias voltage maybe?) coming out from the standby transformer, which reads 13.5v (I believe it should be above 15/16v), any suggestion on what to check next? -
Hello, any help will be apprecited!- Model: Dell G15 5511
- MB: LA-K452P
- Issue: Won't turn on at all, no leds, no keyboard light, no fan spin, nothing happens when pressing power button. NOTHING.
- Customer reported it was turned off and left plugged in during the night and thats it...
- No signs of liquid damage or burned components.
I have checked so far:
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I have a Mb LA-A993P REV 1.0 computer, I am guiding myself with these two shared boards. ;
there are some ICs that are not the same, in this case those of the PU1501 (JD4TB) and PUH1 (NF4SA) images.
n, please identify.
330mA of consumption after 8 seconds turns off. +3VALW AND +5VALW present, EC_RSMRST# , LID_SW# , EC_ON# , ACIN# present.
SUSP# NOT PRESENT, which would be this the problem does not turn on sub-sources Any leakage?
I also notice that in the PLH2 coil that belongs to +1.05VS according to the drawings I am not sure,
...06-27-2024, 06:11 PM -
I am seeking guidance on an Acer Spin 1 SP111-33 that does not turn on when pressing the power button.
Below are the observations and troubleshooting steps I have taken so far: Observations and Tests:- Verified that all critical voltages are present:
- 3.3V and 5V are always present if DC is plugged.
- 1.8V on the BIOS chip is present.
- Checked the power button functionality:
- When pressed, the voltage drops to 0V, indicating the button is functional.
- Inspected the flex cable connecting the USB, audio, and power button to JUB1:
- Confirmed connectivity is intact, ruling out issues
11-26-2024, 12:39 AM - Verified that all critical voltages are present:
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Hello,
I have a Lenovo MB LC40CM 19863-1 when press button is pushed the keyboard backlight turns on and off twice and the power button light keeps blinking and the fans spins for a few seconds and stops then again spins and stops (Three times) then laptop turns off. no image on screen. sometime when you leave it for few days it will turn on and work but once you restart it won't turn on.
Tried to reball RAM 1,2,3,4
Checked all voltages on big coils all present except 1V_VCCGT is not present I get 0V on this rail. is this voltage should be present once power button...