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A dead CRT TV set was brought back to life. Model: JVC AV213EE

By Jestine Yong on April 1, 2014

A friend of mine brought this TV set to my shop for repair. The customer had this TV set in his storage room for almost a year and now he decided to get it fixed.

I powered up the TV set and I could not see anything on the screen not even a stand by light. From experience, when there is no stand by light, my attention will be at the HOT (Horizontal Output Transistor) and the fly back section.

I took the cover off and I saw this dusty board. I had to clean some parts with a brush to see what I am dealing with.

I checked the fuse to make sure it was not open and I just like I expected, it was intact. I measured the voltage at the main capacitor and I was getting the right voltage there.

As I said before, my focus was on the fly back area and the HOT. I de soldered the HOT off board and just like I expected it was shorted on all three pins. It was D1878. It was an NPN transistor and diode in one, TV-HA 1500/800 volts, 5 amps and 60W.

I checked in the replacement book and found out that I could use D1555 transistor instead. For your information, this information mentioned in the data book was not correct because the moment, I installed it there, it took one seconds to blow in three pins. When I checked the information on this transistor, it was almost the same except the Amp part, it was only 5 Amp.

This is where the HOT go in this TV set. Very easy to reach and install. I just love JVC product.

I did one thing before I installed the original part number back on this TV set. I installed a light bulb to the collector pin on the transistor and to ground and light bulb came on and I could read the stand by voltage there.

As you can see, I was getting 81.2 DC voltages there which is a good stand by voltage reading. I added thermal past to the transistor and I installed back on board.

I powered the TV set, here is the result.

Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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