LCD TV REPAIR PART 2

LCD TV REPAIR PART 1

TCL TV

This TCL TV model TCL-2027U has a complaint of loss of vertical sync. I look on the vertical section and change all surrounding electrolytic capacitors that has high esr by using my blue esr meter and nothing happened. following the voltage supply of vertical ic with part number STV9302A going to pin of cpu ic which i think is the vertical sync of that ic i found two electrolytic capacitors  that has leakage on the board or pcb and high esr and one of the capacitor has low capacitance. Changing the two capacitor which has a value of 0.47uf 50volts solve the problem. Here is the picture of 2 capacitors:

Simple FET(Field Effect Transistor) Tester

This a simple and easy to build FET tester. It can test N-CHANNEL FET and P-CHANNEL FET. It is cheap tester that has the following components.
2 pcs. LED color red
1 pc. LED color green
1 pc. DPDT switch
1 potentiometer 10k ohms
2 pcs. resistor 470 ohms 1/4 watt
1 pc. resistor 470k ohms 1/4 watt
8 pcs.aligator clips
1 pc. printed circuit board
1 small bottle of ferric chloride( if you are the one who will design it. You put a tape or pentel pen to your design or circuit so that it will not fade when dip it to ferric chloride)
and some wires.


The 3 aligator clips are used  and assigned to  clip the GATE of fet,  the other one is for the DRAIN, and the last one for the SOURCE for N-channel. And on the otherside for P-channel the remaining 3 aligator clip are assigned to gate, drain and source. If the FET you test n-channel switch to n-channel or likewise you switch to p-channel. If the fet is good only the green LED lit. If the fet is shorted one of the red Led will lit. To confirm the fet is good even if you increase the value of potentiometer or variable resistor to maximum the red LED should not lit or otherwise the fet is bad or has defect. The two remaining aligator clip is to be clip to 9 volts battery or may buy a clip that is suitable for this battery. I hope it will helps.

Horizontal and Vertical Yoke Resistance

The possible resistance of Horizontal Yoke  when you measured in your analog or digital tester might range from 1 to 3 ohms. And to the Vertical Yoke resistance might range from 10 to 15 ohms. It is particularly on tv sets and depend on the size of the tv. But on the other hand there is another test by using Ringer test like this one.http://www.mainelectronics.com/pdf/BlueRingTester.pdf

Transistor Leakage

Transistor Leakage

If you want to know more on tansistor leakage test click on this link above.

EDS-82A, EDS-82B LeakSeeker technical assistance by Electronic Design Specialists

EDS-82A, EDS-82B LeakSeeker technical assistance by Electronic Design Specialists

This tester is an electronic component leakseeker.

LCD TV Repair Guide

LCD TV Repair Guide

This is an e-book regarding how to repair LCD TV. It is only $25.00 to learn to repair your lcd tv. Click on the link above.

ESR Meter Kit - Volt Electronics

ESR Meter Kit

Is this the first esr meter design by bob parker? Well if it's the one you have given the life of the old esr back into the market. It can test esr of electrolytic capacitor and some non polar capacitor like the latest blue esr meter. Click on the link above the title esr meter kit to direct you to or click http://www.voltelectronics.com.au/

Silicon Chip Online - Electrolytic Capacitor Reformer & Tester

Electrolytic Capacitor Reformer & Tester

If you have many electrolytics capacitor in your cabinet, this is an interesting news. It is said that you can reform and test the capacitor from 10 volts to 630 volts. I have only one question does electrolytics can be reform? Say a comment. Click on the link above.