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Re: No 5V found in this Circuit, Please help me.
this scheme is nowhereComment
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Re: No 5V found in this Circuit, Please help me.
yes X451MA Rev 2.1Comment
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Re: No 5V found in this Circuit, Please help me.
OK, This ic marking is JC FL. i think it is RT8239B. it pin2 is 0.9v and pin4 is 5v. when i short pin4 to ground with twezer then 3.3v comes to Coil and power up laptop.Attached FilesComment
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Re: No 5V found in this Circuit, Please help me.
Here about the same.
Resistor on pin 4 has a 100k?Comment
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Re: No 5V found in this Circuit, Please help me.
What is the marking of the transistor?Comment
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Re: No 5V found in this Circuit, Please help me.
pin4 248k and pin2 80k. when i remove pin 2 resistor 3.3v ok and when remove pin4 resistor 5v ok but when 2 resistor use motherboard 3.3v not come.Comment
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Re: No 5V found in this Circuit, Please help me.
Transistor marking 4n34Comment
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Re: No 5V found in this Circuit, Please help me.
I uses 80k resistor and result same. When i put adapter power up laptop and shutdown after 2-3 second.Comment
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Re: No 5V found in this Circuit, Please help me.
In the datasheet says that the 2-pin and 4-pin stand at 100k resistors, try to put it to 100k for 2-pin and 4-pinComment
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Re: No 5V found in this Circuit, Please help me.
yes same. also pin 4 have 5 so that 3.3v not going to coil.
when i remove pin2 resistor 3.3v ok when remove pin4 resistor 5v ok. but when use this two resistor only 5v continue present, but 3v come when adapter pluged in and turn off 2-3 second. that means 5v continue ok but 3v problem.Comment
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Re: No 5V found in this Circuit, Please help me.
i connect 95k resistor to pin2 and 100k pin4 but same.Comment
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Re: No 5V found in this Circuit, Please help me.
Launch control duty 3 and 5 volts engaged EC, try to flash it flash driveComment
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Re: No 5V found in this Circuit, Please help me.
reflash bios?Comment
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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 an ASUS ROG Strix- G513IH-HN008, motherboard G513-6050A3249301- MB-A04 (A4)
When I received the device, the device has no function. After an investigation, I found that the PWM CONTROLLER RT6575B (U6100) is getting warm and there is a short circuit at the 3V3 output. This normally supplies 3V3 for the embedded controller IT5571E-128 (U301). When measuring and analyzing with a thermal imaging camera, I found that some components are damaged: SLG4E42553VTR (U8500), IT5571E-128 (U301), LAN RTL8111H (U450), LOGIC 74LVC1G08GW (U1900), RT6575B (U6100) All these components are on... -
Hi there,
First, I'm not sure it's the right section to post for this type of device, but could not think of something better.
Ok, so my son (a mechanic) bought a faulty Hofmann Geodyna 6300 wheel balancer (which appears to be mostly a re-branded Snap-on wheel balancer).
I'm looking for any resources (doc, manuals, schematics) that would be available for this device or anyone that would have any knowledge on this particular device (or its Snap-On equivalent).
I'm trying to diagnose the fault(s ?), but I can't find any schematic (appart from the... -
Hi friends of electronics
What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.
The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.
Please help me fix this circuit.
(the datasheet of the IC: https://pdf.datasheet.live/28... -
I got a tricky one today in the form of a macbook air A1466 820-00165-A that will recognize the charger and turn the light green then back to orange and the fan will spin constantly, but the system won't power on. The screen never turns on, it doesn't make the bong noise it's supposed to, and pressing the power button doesn't do anything. When I took the board out to visibly inspect it I only found one spot of corrosion on the bios IC. I pulled the chip, cleaned it and the area with IPA and put fresh solder on both and put the bios chip back on, but when I went to test it again it still does the...
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