Today, I am repairing a POS unit which is used on the transaction on the sale in the Mall I am working.
The problem of this unit is that having a No Display Problem. I checked the unit and found out that there are a lot of electrolytic capacitors that get bulgy on its top which is a sign that it is defective. So I take out from the circuits those two big electrolytic capacitors for checking. You can also replaced directly all... [ Continue reading... ]
The best way of testing a capacitor will depends to the type of capacitor you are going to test. Electrolytic capacitors that are leaky are not so common. You can take each capacitor out on the circuit and test it using a cap checker or using your VOM, but in-circuit testing of the capacitor is quicker and save a lot of time.
Do a visual observation and inspection to the capacitor and see if there are any electrolytic capacitor are bulging... [ Continue reading... ]
These are the common display or deflection problem that you can encounter when troubleshooting a CRT TV and Monitors. You can print this image to serves as your reference when you are repairing a deflection or display problems of a CRT TV and Monitors. For beginners who are new in this field, they don't know how it looks like a Pincushion or Keystone Distortion problem, that is the reason why they have difficulty in looking the fix... [ Continue reading... ]
Early this morning, I've got a call from Jollibee ICM regarding to the UPS on one of their POS because it is not turning on. So I go to there place and checked he unit and I've decided to pull out their UPS to it to IT office to check for the possible cause of the problem.
When I arrive in the office, I checked the unit immediately and I've found out that the fuse is blown. So I check the circuit board for the possible cause of blowing the... [ Continue reading... ]
One of my co-worker brought his dead power supply. This is a power supply of a slim type desktop computer. The history of this unit, it is a package from abroad and it is rated as 220 voltage source. He plugged the unit to the outlet and shocked when it sparks and the unit is not turning on. So he brings the unit here in the office for repair.
I checked the unit and I found out that the fuse is... [ Continue reading... ]
Recently, I got this unit from my cousin for repair. It is a Sharp Component System with a model number CD-BA3100H having an er-ap00 Error.
Before the Repair
I have searched to the internet for some possible solutions for this kind of error but I can't find any solution regarding in this error. So I try to repair this unit. I have opened it and try to isolate the problem. This unit have two Power Amplifier, I hang up the Power Amp IC one... [ Continue reading... ]
This is a project for those who want to build their very own Automatic Battery Charger. This is a project made by one of the member of Elab Forum, duc_tech. But as a reminder, this circuit don't have a current limiter which means this charger is good to use only on a known good battery but not on a battery that have defects like having a short or open plates which will cause the diodes, switching Thyristor and transformer to heat easily.... [ Continue reading... ]
In this post, I will share to you an article from the Elab Forum about the Aiwa Mini Component that RoYa16 is repairing. It has a no power problem. Won’t power ON but the tape indicator (play, rewind, Fast-forward) have light indicator even it is not power on. So he troubleshoots the main board but it is ok according to him, then after that he troubleshoots next the front board. In the front board, here he saw shorted electrolytic... [ Continue reading... ]
I have just received this PS2 keyboard from other department for repairs. A defective is one of the most commonly cause of the problems for an undetected PS2 Keyboard problem especially in the office. It doesn't have any function on all its keys and it is also not detected by the PC. So I checked first the wire for a trace of a broken (putol) wire. Then I found out that the red wire is broken (putol). I get the pin config of the defective... [ Continue reading... ]
