solution for blog reader

I am KANTH ,
I am an INDIAN, U R beside state ANDHRA PRADESH, Vijayawada
I found u r email id at , http://ecare-electronics.blogspot.com/
while i browsing the , http://humphreykimathi.blogspot.com/
I am kid in this electronics field I am intersted on MONITORS, SMPS , MOTHER BOARDS servicing , how to
FASTLY troubleshoot procedures on the LOT fault finding problems
solving them ,
i.e; tips how to use BULB loads OR RESISTOR high watt at Horizontal
section at Horizontal yoke , at the LOT as the series Load, Problems finding ,SMPS quick methods
troubleshooting. With GOD`s help i browsed websites and learned .
PLS respond
Thank u
KANTH
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Hi Kanth,

Thanks for the belief in me and my friend Kimathi.

Let us take one by one each time.

tips how to use BULB loads OR RESISTOR high watt

See in order to check weather the SMPS is working fine or not we use bulb load.

If TV is having power supply problem inorder to check if the power supply is producing constant voltage 110 v (or as mentioned by the manufacturer ) we can use a 40 watts bulb for the load.

we need to disconnect the horizontal output transistor from the circuit and need to connect the bulb one point to collector point of the H out transistor and another to emmitor point of the H out transistor. Then we can start repairing the power supply. If power supply is working properly by producing constant voltage then the bulb glows with a constant brightness.Other wise it starts blinking as the voltage is unregulated.

also for the further accuracy of the SMPS circuit you can slightly vary the preset given in the power supply.as you vary the preset it bulb brightness starts varying. This shows power supply is perfect. Now you can connect the HOut to the board and switch on the TV. If Hout goes with tik-tick-tick sound means the problem will be in Line Output transformer (99 percent).

Also we can use the same bulb loading to find out SMPS short circuit.I will explain that in next post.

Please feel free to ask any question.

Regards

Raghavendra kumar