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Hi, I have not 3.3 or 5V on output but the 19V is there at the IC VIN pin SO.... how does the "on" pins work if they need 5V? ect to turn IC on if the IC isnt making any voltage 3.3 or 5?? i dont see any volts at those pins and no lights on or fan. Same with 1.2V IC too. So are all the "ON" not activating on this board's ICs that make small voltages? They all have 19V available it seems but board is dead, no lights or fan. What sends signals to the "ON" pins on the little IC's and how do i turn these IC's "ON"? Thanks for any help.
Hi there It sounds like you're troubleshooting a board where the expected voltages are not being generated. Let’s break down the issue systematically and address how the "ON" pins work and what might be going wrong: 1. Understanding the "ON" Pins: In power regulation ICs, especially for voltage converters or PMICs (Power Management ICs), the “ON” or “EN” (enable) pins are used to turn the IC on or off. These pins typically require a certain input voltage level to activate the IC and allow it to output the desired regulated voltage (like 3.3V, 5V, 1.2V, etc.). If these “ON” pins are not being properly triggered, the ICs won’t start operating, and you won’t see any output voltage, which aligns with the issue you’re describing (no lights or fan activity). 2. Power Sequencing and Enable Signals: Power management ICs often require proper sequencing or control signals to turn on. For example: Soft-Start Sequence: Some systems have a sequence in which certain voltages must stabilize before others are enabled. This can prevent incorrect voltage levels from damaging sensitive components. External Signals: In some cases, an external signal from another part of the board (a microcontroller or another IC) may be responsible for toggling the enable pins. If this signal is missing or not being generated correctly, the ICs won’t receive the voltage they need on the “ON” pins to activate. Since you're seeing 19V at the VIN pin but no voltage at the enable pins, this suggests that the IC may not be receiving the correct control signal to start generating the lower voltages (like 3.3V, 5V, or 1.2V). 3. Common Reasons Why "ON" Pins Aren’t Activated: Here are some possible causes for why the ICs on your board are not turning on: Missing Control Signal: The enable signals may be generated by another IC, such as a microcontroller or a power management controller. If this signal is not present or malfunctioning, the ICs will not receive the voltage they need to operate. Faulty Components: If the power supply is providing 19V, but there’s no voltage on the enable pins, it’s possible that there is a fault in the ICs or other supporting components. For example, resistors or capacitors that are part of the enable circuitry could be damaged or out of specification. Damaged ICs: The power management ICs themselves may be damaged or have internal faults that prevent them from responding to the "ON" pin signals. This could happen if there was an over-voltage or short circuit that affected the ICs. PCB Short or Open Circuit: A short circuit or open trace on the PCB might be interrupting the flow of control signals to the enable pins. Inspect the PCB carefully for any visible damage or signs of burnt areas or cracked solder joints. Improper Power Sequencing: Some systems require that the enable pins be triggered in a specific order. If one of the voltages is not properly regulated or sequenced, it could prevent the enable pins from activating. 4. How to Troubleshoot: To isolate the issue, try the following steps: Check the Enable Pin Voltage: Use a multimeter to check if there is any voltage at the “ON” or enable pins of the ICs. Compare the voltage levels to what is expected in the datasheet for each IC. Verify Control Signals: If you have access to a schematic, identify where the enable pins are connected and see if there are any external components (like transistors or microcontrollers) responsible for generating the enable signals. If possible, measure the voltage at the control signals to ensure they are present. Inspect Components and Traces: Visually inspect the board for any burnt or damaged components, especially around the ICs and their associated circuitry. Look for cracked or broken traces. Check Power Sequencing Requirements: Some ICs have strict power sequencing requirements. Check if the board requires certain voltages to be available in a specific order before the ICs can turn on. Good luck my Fiend
@@electronicsrepairbasics_erb Hi, MANY thanks for such a detailed reply and i will copy and study it totally after i already scanned through it for ideas. Excellent thanks!!!!! I have UPDATE!! and will list what i have found. First - I seem to have a "soft short somewhere as i NOW have 11 ohms at the "current sense resistor" back at the power connector? and the adapter is flickering as it protects itself Still no output at 3.3 and 5v and the other small ones 1.2 ect those IC's stages too- ALL DEAD with 19V So i decided to apply only 3V at the power connector and bring it up gently and i have same voltage of course at the 3.3/5V stage inductor. BUT NOW if i take it to 2V, the chip is OUTPUTTING!! couple of volts on 3.3 and 5V and rises a bit as i go higher BUT one of the 2 mosfets going to that Chip is getting HOT at 3V!! OK, looking at the schematic one mosfet Base has a resistor then straight to chip, that one is cold. the other is hot and it goes to ground and the base goes STRAIGHT to the chip, no res or caps ect. DIRECT to chip!! On the picture, The mosfet on top of the 5V line is cold and the one below the line to ground is Hot and Base is direct to chip pin. If i raise volt to 3-4V, THAT mosfet gets really hot AND the output DROPS back?? Also i checked the BIOS chips and it has about 1.3 V approx there from about 2-3V . IF that mosfet is getting really hot and the base goes to the chip, does that mean the chip is working but partially shorted through the chip? where else can current go? If i turn up the voltage from 2V to 3V that chip get very hot and voltage reduces so something is very wrong BUT the chip is make voltage output at least but not 3.3 or 5. this is a excellent training board as if i can just get the lights to turn on even if the GPU, CPU, Southbrige might be shorted, the lights should come on with 3.3 and 5 on and that chip SEEMS to be outputting when i put low voltage into it from the inductor. The inductor at the Chip is 12 ohms too as i guess through that mosfet the current is about 1 amp when i take it to 3 V and mosfet gets very hot and output declines a bit. I happy chip is working!! 5V side, Hot mosfet is 10 ohms and cold one is 2 ohms. The 3.3V side, both mosfets are cold and out put is 1.5V and those 2 mosfets are around 30-50 ohms But something is very wrong of course, any help would be very appreciated as i have many boards with shorted GPU'S so cant repair without doing bga but others i might be able to fix with missing voltages, shorts ect without needing to do BGA repairs which are hit and miss. Hope i made this clear to understand. Summary- The Chip is outputting 1.5V only on 3.3 and 5V outputs from small voltage 2-3V Input. one Mosfet of 2 on 5V side is getting really hot and 3.3 V side both mosfets are cold and output is 1.5V with 2-3 V input into chip. Many thanks for all your videos and any help you can give.
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Hi, I have not 3.3 or 5V on output but the 19V is there at the IC VIN pin SO.... how does the "on" pins work if they need 5V? ect to turn IC on if the IC isnt making any voltage 3.3 or 5?? i dont see any volts at those pins and no lights on or fan. Same with 1.2V IC too. So are all the "ON" not activating on this board's ICs that make small voltages? They all have 19V available it seems but board is dead, no lights or fan. What sends signals to the "ON" pins on the little IC's and how do i turn these IC's "ON"? Thanks for any help.
Hi there
It sounds like you're troubleshooting a board where the expected voltages are not being generated. Let’s break down the issue systematically and address how the "ON" pins work and what might be going wrong:
1. Understanding the "ON" Pins:
In power regulation ICs, especially for voltage converters or PMICs (Power Management ICs), the “ON” or “EN” (enable) pins are used to turn the IC on or off. These pins typically require a certain input voltage level to activate the IC and allow it to output the desired regulated voltage (like 3.3V, 5V, 1.2V, etc.). If these “ON” pins are not being properly triggered, the ICs won’t start operating, and you won’t see any output voltage, which aligns with the issue you’re describing (no lights or fan activity).
2. Power Sequencing and Enable Signals:
Power management ICs often require proper sequencing or control signals to turn on. For example:
Soft-Start Sequence: Some systems have a sequence in which certain voltages must stabilize before others are enabled. This can prevent incorrect voltage levels from damaging sensitive components.
External Signals: In some cases, an external signal from another part of the board (a microcontroller or another IC) may be responsible for toggling the enable pins. If this signal is missing or not being generated correctly, the ICs won’t receive the voltage they need on the “ON” pins to activate.
Since you're seeing 19V at the VIN pin but no voltage at the enable pins, this suggests that the IC may not be receiving the correct control signal to start generating the lower voltages (like 3.3V, 5V, or 1.2V).
3. Common Reasons Why "ON" Pins Aren’t Activated:
Here are some possible causes for why the ICs on your board are not turning on:
Missing Control Signal: The enable signals may be generated by another IC, such as a microcontroller or a power management controller. If this signal is not present or malfunctioning, the ICs will not receive the voltage they need to operate.
Faulty Components: If the power supply is providing 19V, but there’s no voltage on the enable pins, it’s possible that there is a fault in the ICs or other supporting components. For example, resistors or capacitors that are part of the enable circuitry could be damaged or out of specification.
Damaged ICs: The power management ICs themselves may be damaged or have internal faults that prevent them from responding to the "ON" pin signals. This could happen if there was an over-voltage or short circuit that affected the ICs.
PCB Short or Open Circuit: A short circuit or open trace on the PCB might be interrupting the flow of control signals to the enable pins. Inspect the PCB carefully for any visible damage or signs of burnt areas or cracked solder joints.
Improper Power Sequencing: Some systems require that the enable pins be triggered in a specific order. If one of the voltages is not properly regulated or sequenced, it could prevent the enable pins from activating.
4. How to Troubleshoot:
To isolate the issue, try the following steps:
Check the Enable Pin Voltage: Use a multimeter to check if there is any voltage at the “ON” or enable pins of the ICs. Compare the voltage levels to what is expected in the datasheet for each IC.
Verify Control Signals: If you have access to a schematic, identify where the enable pins are connected and see if there are any external components (like transistors or microcontrollers) responsible for generating the enable signals. If possible, measure the voltage at the control signals to ensure they are present.
Inspect Components and Traces: Visually inspect the board for any burnt or damaged components, especially around the ICs and their associated circuitry. Look for cracked or broken traces.
Check Power Sequencing Requirements: Some ICs have strict power sequencing requirements. Check if the board requires certain voltages to be available in a specific order before the ICs can turn on.
Good luck my Fiend
@@electronicsrepairbasics_erb Hi, MANY thanks for such a detailed reply and i will copy and study it totally after i already scanned through it for ideas. Excellent thanks!!!!!
I have UPDATE!! and will list what i have found.
First - I seem to have a "soft short somewhere as i NOW have 11 ohms at the "current sense resistor" back at the power connector? and the adapter is flickering as it protects itself
Still no output at 3.3 and 5v and the other small ones 1.2 ect those IC's stages too- ALL DEAD with 19V
So i decided to apply only 3V at the power connector and bring it up gently and i have same voltage of course at the 3.3/5V stage inductor. BUT NOW if i take it to 2V, the chip is OUTPUTTING!! couple of volts on 3.3 and 5V and rises a bit as i go higher BUT one of the 2 mosfets going to that Chip is getting HOT at 3V!!
OK, looking at the schematic one mosfet Base has a resistor then straight to chip, that one is cold. the other is hot and it goes to ground and the base goes STRAIGHT to the chip, no res or caps ect. DIRECT to chip!! On the picture, The mosfet on top of the 5V line is cold and the one below the line to ground is Hot and Base is direct to chip pin.
If i raise volt to 3-4V, THAT mosfet gets really hot AND the output DROPS back?? Also i checked the BIOS chips and it has about 1.3 V approx there from about 2-3V .
IF that mosfet is getting really hot and the base goes to the chip, does that mean the chip is working but partially shorted through the chip? where else can current go?
If i turn up the voltage from 2V to 3V that chip get very hot and voltage reduces so something is very wrong BUT the chip is make voltage output at least but not 3.3 or 5.
this is a excellent training board as if i can just get the lights to turn on even if the GPU, CPU, Southbrige might be shorted, the lights should come on with 3.3 and 5 on and that chip SEEMS to be outputting when i put low voltage into it from the inductor. The inductor at the Chip is 12 ohms too as i guess through that mosfet the current is about 1 amp when i take it to 3 V and mosfet gets very hot and output declines a bit. I happy chip is working!!
5V side, Hot mosfet is 10 ohms and cold one is 2 ohms.
The 3.3V side, both mosfets are cold and out put is 1.5V and those 2 mosfets are around 30-50 ohms
But something is very wrong of course, any help would be very appreciated as i have many boards with shorted GPU'S so cant repair without doing bga but others i might be able to fix with missing voltages, shorts ect without needing to do BGA repairs which are hit and miss.
Hope i made this clear to understand.
Summary- The Chip is outputting 1.5V only on 3.3 and 5V outputs from small voltage 2-3V Input. one Mosfet of 2 on 5V side is getting really hot and 3.3 V side both mosfets are cold and output is 1.5V with 2-3 V input into chip.
Many thanks for all your videos and any help you can give.
I didn't see the link Boss
In the second line of The description
Thanks sir
My pleasure
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Can you be my mentor sir
@@solomonfernandes9518 Of course, join me to be part of my elite class. The link in the top of the DESCRIPTION. Note that the mentorship spots is limited so hurry up.
See you inside
Can you be my mentor sir🙏
Of course, @mathiaseze2286! Join me in my elite mentorship program. The link is at the top of the description. Spots are limited, so don't wait - see you inside!
@@electronicsrepairbasics_erb sir send me your WhatsApp links 🙏
Thanks sir
Welcome brother