Friday, January 13, 2017

14 inch China Television sound OK but no picture

I got this phone call from a client who wanted his television checked by a technician, I passed by and I found the TV was ON but there was no picture on the screen (dark screen) but audio was present and very clear.

I opened the TV on site and the board was covered with one inch thick layer of dust and therefore decided not to disturb it lest it cause havoc in the customer house.

But I did some scanning using my set of natural tools in the name of eyes and I was able to see two big capacitor with top slightly swollen.



Friday, January 6, 2017

Ramtons toaster model RM/195 dead, now working

I received a phone call from one of my neighbor who wanted to know if I repair bread toaster, he was right because toaster repair is not my area of specialization.


This is because I decided from the word go I will not be a jack of all trade but master of none and therefore my area of specialization is TVs, Monitors,DVDs, SMPS.

Being my neighbor I decided to see if I can be able to help bring his toaster back to life and I requested him to drop it at my place so that I can check it in the evening as I usually have another full time job.

Came evening I found the toaster already waiting for me, I applied power, pressed down the push down plunger and nothing happen.


Tuesday, December 13, 2016

Customer support-Mangala from Sri Lanka

Mangala Wijetilake from Sri Lanka

Hi Humphrey,
On these days I am reading your E-book on Troubleshooting of TVs.  It is very interesting and several questions have arisen in my mind when reading.
It is very much appreciated if you could reply to following questions.

1. There were some tests which have been carried out by dummy load (250 V bulb). How do i decide the wattage of the bulb. Does it depend on the wattage of the TV set?

No really Mangala, you can even use 40 watts, usually it is not wise to dis-connect the B+ line and test it without the load but if you don’t have the load in place then you can test briefly to check the presence of voltage once the B+ load is isolated.

If you isolate the load and apply power and find the B+ has voltage and stable then you can conclude that the primary side is okay and no need of checking it.

Suffice to say here that this is done when you tested the B+ voltage and find it missing and when you dis-connect it you find the B+ voltage now re-appears.
  


Wednesday, December 7, 2016

14” inch China Television with high output voltage now repaired

This television was brought in for repair by my neighbor, upon opening the television I started troubleshooting using the free tools of the trade (my eyes)

I scanned around the whole circuit looking for any swollen capacitor or burnt areas which is usually suspect or signs of stress in electronics gadget.

I noticed a swollen capacitor on the secondary side of the S.M.P.S (C562). Swollen capacitors are usually caused by high voltage on that line and therefore I wanted to find out which line is the capacitor filtering.




Friday, November 25, 2016

Thursday, November 24, 2016

MK-328 Transistor Tester Capacitor ESR Inductance Resistor Meter LCR NPN PNP MOS

 Multi component tester now available!










About this meter.
This meter is an intelligent semiconductor device analyzer, it can measure most of the diodes, bipolar Transistors, Junction/MOS FETs and low power thyristors. It automatically identifies the type of devices and pinouts, measures the current gain HFE, gate threshold and FET junction capacitance, a typical application is to pair two transistors or identify an unknown SMD device. The test clips can be connected any way round, the pinout can be identified and displayed on screen vs. test clip numbers. Beside the semiconductor device analyzer, this meter can also work as a RLC/ESR meter






1pc Transistor Tester
  
Now available and ship worldwide free shipping!

Sunday, November 13, 2016

21 Inch CRT Television dead now repaired


First let me point out this television belong to my youngest sister, she called me to pass by her place but due my busy schedule I was not able  to make in time.

Therefore she decided to ask for assistance from the nearest technician near her home town.

Of course this I came to learn later otherwise according to her the television never left the house.

I passed by her place and after a small briefing about how the problem started, I was told that there was power brown out in the estate when the problem started.

For those who don’t know what is power brownout- electrically speaking is a drop in voltage in an electrical power supply,so named because it typically causes lights to dim.

21 Inch CRT Television dead now repaired

First let me point out this television belong to my yongest sister, she called me to pass by her place but due my busy schedule I was not able  to make in time.

Therefore she decided to ask for assistance from the nearest technician near her home town.

Ofcourse this I came to learn later otherwise according to her the television never left the house.

I passed by her place and after a small briefing about how the problem started, I was told that there was power brown out in the estate when the problem started.

For those who don’t know what is power blownout- electrically speaking is a drop in voltage in an electrical power supply,so named because it typically causes lights to dim.

Monday, October 31, 2016

Causes of vertical lines in LCD Television

Vertical lines in LCD television maybe as a result of several causes and here is am going to highlight a few which may be considered main causes.

1. Top on the list is the T-con board (timing control board) this is a small board usually under shield, used to converts the video signal into something the LCD panel can understand (synchronizing).

Causes of vertical in LCD Television

Vertical lines in LCD television maybe as a result of several causes and here is am going to highlight a few which may be considered main causes.

1. Top on the list is the T-con board (timing control board) this is a small board usually under shield, used to converts the video signal into something the LCD panel can understand (synchronizing).

Causes of vertical in LCD Television

Vertical lines in LCD television maybe as a result of several causes and here is am going to highlight a few which may be considered main causes.

1. Top on the list is the T-con board (timing control board) this is a small board usually under shield, used to converts the video signal into something the LCD panel can understand (synchronizing).

So if the board has a problem may cause complete no picture or vertical lines on the screen.


2. Low Voltage Differential Signaling (LVDS). Converts the 8-bit parallel RGB video information into a set of high speed serial lines for noise-free transmission to the T-CON board.

So if this cable is damaged the transfer of the signal from the processor to the LCD screen will be affected and therefore this may also cause vertical and horizontal lines on the screen.



3. LVDS connector. Sometime the tab connector to the LVDS cable may get loose and this also can cause vertical lines on the screen, that is why it is important to always check the cable is well connected.

If you get vertical lines on the screen or even the screen is blank could point to a loose connection at the tabs.


That's all for today friend, if you want to go deeper check out more material here. and for those interested in LCD Monitor repair i highly recommend the eBook below.





Saturday, October 15, 2016

14 inch LG super slim Television with wide horizontal line repaired.

I received a phone call from a customer who wanted to have his TV checked by a technician and on my way home from work, I passed by his place.

On reaching the place I found the TV already on and the audio was present and clear but the screen as you can below.