2019-11-17 09:35
Dell 2320Lf 23' display, no power issue, a quick check found out 2 diodes possibly short circuit.
Either diode D854 or D855 or both
Original parts = SR520, try to replace with equiv… Read More
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Tags:
board
output
nand
sensor
inverter
power supply
replace
corner panel
controller
samsung syncmaster
2018-06-07 14:48
This W5500 ethernet module available at Lazada for less than USD6
Just search for W5500
Connect through SPI interface
7 connections needed from the ethernet module
(5V, GND, MISO, MOS… Read More
2017-05-14 16:18
Mount the dash-cam accordingly. Tuck in the usb cable in the headliner until you reach the corner panel.
Pop up the corner panel. Careful not to break the panel clips. The are 5 of them.
Run… Read More
2016-11-29 15:45
There are several references on how to do this such as;CT sensors - Interfacing with an Arduino
How to build an Arduino energy monitor - measuring mains current only.
For my case, I would l… Read More
2016-01-01 16:31
Symptom, no backlight, but the LCD it self is OK.
Inverter board (left) and main board (right).
Inverter board close up.
From my observation, this board will works when hot b… Read More
2015-12-24 14:35
Before...
Get a white LED strip. 5 meters = USD7
Mount it...
End result Read More
2015-10-24 10:57
Experiment With NAND Gate - CMOS 4011
(CMOS 4011 Layout)
Circuit
Try this super-simple experiment. The output frequency is about 1kHz (square wave).
The NAND output is on CH1 (bottom… Read More
2015-10-16 14:27
Just to share how to fix Noxxa Multifunction Pressure Cooker no power issue.
Symptom: The front panel didn't light up. So let's open it.
Start check the simple things first, temperature… Read More
2014-10-03 15:30
A Samsung SyncMaster 732NW Monitor came in last 3 weeks into my workshop after getting struck by lightning. This is what happen to the power supply board.
A bad capacitor, several d… Read More
2014-05-28 13:34
This is my own Plasma TV. Symptom, sudden power cut off. Power LED not lit at all when the side power button switched on. According to the service manual [ th_p42x30d_g_k_m_p_s_v_1.pdf… Read More
2013-08-15 16:48
My old Dell E153FPC back-light recently failed to light up.Tracing lead me to the bad inverter circuit and broken CCFL back-light.
So replacing with an LED would be a great idea. Refering… Read More
2013-08-15 16:04
Received Samsung Syncmaster 2043 from a friend, suffering from a flickering problem.
Quick search from internet advice to look for a crack/swollen capacitor(s)
Immedialtly found 2 bad c… Read More
2013-05-15 11:35
I have an electric water boiler and warmer AKA thermo pot which was struck by lightning. The circuit board was heavily damaged beyond repair.
But the good news is all other parts such a… Read More
2013-03-22 13:58
Last week, I came across 2 different model same brand dead ceiling fan. Both models are remote controlled model. Symptom quite similar.
The first model comes with 7 speed but I can only see… Read More
2012-08-25 12:45
Descrition & Circuit
This project is taken from www.electronics-lab.com.
With some modification, I create my own version of FM Telephone bug complete with stripboard layout.
Theort… Read More
2012-08-25 12:45
Description and Circuit
Make your own lab power supply complete with adjustable voltage and constant current source.
Using single IC (LM324)
Here is the circuit.
Strip Board Layout.
Part Li… Read More
2012-08-25 12:44
Since M1-DA to VGA cable is quite expensive, we have decided to add extra connector to our Dell 3400MP Projector so we could just use common male to male VGA cable.
1st thing to do is to kno… Read More
2012-06-11 15:38
My 24kV high voltage "Jacob's Ladder" from DIY flyback transformer driver using 555 timer. Creating an electric arcI've always wanted to create an electric arc but don't know how. Then I co… Read More
2011-06-09 15:02
Simple DIY Cable Continuity Tester
How to use
This simple cable tester can be used to check 2 wire cable such as coax cable, telephone cable, audio cable and etc.
Power the circuit using 9… Read More
2010-04-19 15:27
What is P16PRO40? It is a programming tool for several types of PIC micro controller. I'm not sure the origin of it, but I found it here at http://www.winpicprog.co.uk/ while browsing. The s… Read More
2009-12-29 16:26
A friend of mine ask for a favor to take a look at his HP TX1000 Entertainment Tablet PC blackout LCD problem. I have no idea on how to fix this until I found below video.
Instead of using… Read More
2009-11-21 14:41
DIY IR interface
This circuit is also from www.electronics-lab.com.
Since it is very hard for me to get the infrared interface (TFDU4100), I start to look in the old/damage handphones.
It l… Read More
2009-11-21 14:07
Using old phones
Using your old phones, you could create personal "micro" telephone exchange as simple as above circuit.
I manage to solder the test circuit less than a minute. Than connect… Read More
2009-11-21 13:56
Upgrading DivX Player Firmware
Planning to upgrade your DivX player using CD? Good idea but if anything happen, your player will be dead.
In order to revive it, you need to re-flash it.
Re… Read More
2009-11-21 13:42
Biquad Antenna for 2.4 GHz - 802.11b/g - WiFi - WLAN
After some research, I found out that the simplest type of
homemade WLAN antenna is BiQuad antenna. Many sites provide good
instruction o… Read More
2009-11-21 13:36
About ATX Power Supply
ATX Power Supply converts the wall (AC) to the direct current (DC) needed by the
PC. The power supply looks like a metal box with fan.
Typical computer power supply… Read More
2009-11-21 13:22
Circuit & Information on TOSLINK interface
So you want to get a high quality audio for minidisc recording but when
using red and white RCA, the quality drop drastically. Here a my cheap… Read More
2009-11-21 13:07
Experiment With NAND Gate - CMOS 4011
Output goes high when touch wires bridge by finger Read More
2008-12-23 13:23
Have you ever experience a bad optical mouse? It went double click action whenever you did a single click action? At first, I try to Google for answer but none of them help. I’ve tried… Read More
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