Re: hp x360 La-F013P need schema
@mitchw, check the attached image.
The original image was about 6 MB, after uploading here, it's 983.7 KB, I hope it will be still clear!
Anyway, UC9 is an 8-pin SMD chip, with marking::
BC0A
7Y19
(the second line irrelevant ?)
Best Regards,
Roger...
digitalDNA
Member
Last Activity: 05-24-2024, 05:50 PM
Joined: 03-03-2022
Location: Beirut
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Re: schematic for hp elitebook 840 g1
Hello,
Can someone please provide the board view for HP EliteBook 840 G1 (6050A2560201-MB-A03) ?Leave a comment:
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Re: Need help identifying an SOT23-6 with marking 5719k
Dear harp,
Thanks a lot, it seems to be also fitting the circuitry on the board
Leave a comment:
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Need help identifying an SOT23-6 with marking 5719k
Hello,
While trying to identify the source of a short circuit on a satellite receiver (Nasatronic NTC-02), I found the component causing the short as a 6-pin SMD chip in an SOT23-6 package with marking 5719k.
Does anyone know what this chip is ?
It can also help if someone can provide the schematics of this receiver.
Best Regards,
Roger...Last edited by digitalDNA; 11-26-2022, 04:23 PM. -
Re: Schematics for JCD 908S adjustable soldering iron
The information I gave regarding pin 6 P1.7 was not accurate.
pin 6 P1.7 (ADC_CH0) is connected to R4 (56K) to pin T1 of the triac (BT136) and to current sense resistor R1 (1 ohm). R1's other end is connected to (Neutral, Q1.Vss, let's call it GND). Q1 is a voltage regulator chip (XC6206P332, 3.3 V regulator).
To be able to perform A/D conversions, and measure the voltage across R1, the MCU's Vss (pin 7) should be connected to ground. This connection is gone on my board, I will fix it.
Another...Leave a comment:
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Re: Schematics for JCD 908S adjustable soldering iron
the cap is good, as the voltage regulator is getting voltage on its input, and outputing 3.3 VLeave a comment:
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Re: Schematics for JCD 908S adjustable soldering iron
Hi Lisa, thank you for this diagram, however, it's not the complete circuit,
I also need the part that shows where the MCU's Vss pin is connected, as well as to which pin of the MCU the triac's gate is connected.
In fact, I've followed some of the traces, and the only possible ones for the gate are:
pin 4 P2.0
pin 6 P1.7 (connected through R4 56 k to the regulators's Vss pin)
pin 11 P1.4 has PWM capability (PWM0_CH1)
Other pins connect to the +/- buttons, the display,...Leave a comment:
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Re: Schematics for JCD 908S adjustable soldering iron
Also notable to say that the heater has only 2 pins.
There seems to be no temperature sensor anywhere, so how does such a device really control the temperature ?!
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Schematics for JCD 908S adjustable soldering iron
Hello,
Does anybody have schematics for JCD 908S 220V 80W adjustable soldering iron ?
Mine lately stopped working, nothing is being displayed on the screen.
I was using it normally the day before, the next day, it just didn't work.
No component seems to be blown.
The heater resistance is around 140 ohms, measured off-circuit, is this value normal ?
On the board, there's an MCU, the MS51FB9AE by nuvoTon (the company is new to me), but pin 7 (Vss) is only connected to a capacitor, I couldn't find where it... -
Re: MOSFET maintains voltage drop across G and S only for 3 seconds
The MOSFETs are W25NM60N by ST Microelectronics.Leave a comment:
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MOSFET maintains voltage drop across G and S only for 3 seconds
Hello,
While trying to fix an SMPS, I hear a ticking sound.
I've checked all capacitors, but none seem to be shorted.
I then suspected an issue with the flyback transformer which has 3 leads on the primary (used in a push-pull configuration ?) and one of them, which is always connected to GND has a resistance reading in the order of Mega ohms with any of the other 2 leads on the primary.
But I thought let's check the MOSFETs first::
The circuit also contains a PFC circuit, controlled by a UCC3818D (D stands for the SMD version),... -
Failed to identify SMD component with markings 81 and 947 and package SOT-89
Hello,
I can't identify a component labeled Q1 on the main board of a redundant server PSU from Etasis, product name EFRP-465
ICs on the board have labels with prefixes U, so we have U1, U2, etc. The mysterious component is labeled Q1, so it must be a transistor (BJT)/MOSFET/etc.
I have attached the image for Q1.
I have searched multiple SMD reference websites without being able to identify the component.
Here is some important information from the board::
1. Pin 2 and the tab are connected to GND (after unsoldering Q1,... -
Need schematics and board view for HP Spectre 13-af093TU DBP 32 LA-F013P
Hello,
Does anyone have the schematics and board view for HP Spectre 13-af093TU DBP 32 LA-F013P ?
Many thanksLeave a comment:
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Re: Toshiba Tecra Z40-A653 PT449V boardview and schematics
It's MDK MB-17 W
1401-2Leave a comment:
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Toshiba Tecra Z40-A653 PT449V boardview and schematics
Hello,
Can anyone please provide the schematics and boardview for Toshiba Tecra Z40-A653 PT449V ?
Thanks -
Re: New Members - please post your introductions here
Hello guys, this is Roger from Lebanon.
I'm into software programming, networking, cloud computing, etc.
I'm also an electronics enthusiast since I was 13!
I play with MCUs (TI's TM4C123GH6PM 32-bit MCU) and some Arduino stuff
I lately used an Arduino Nano with ADS1115 (16-bit ADC) to monitor and log power rails on my sister's Apple MacBook Pro A1278 (820-2396B) and discovered one power rail gets down to 0 when the screen glitches (strange green and red patterns).
...Leave a comment:
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