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3 phase 13A Lübcke variac
Merlin Gerin PM700 power meter
I received a broken 27″ Prosonic LCD TV from a friend, it was on the way to get trashed if I did not want it.
Prior experience told me to accept this offer and see what it would take to repair it.
WARNING!: Working with electricity is dangerous, all information found on my site is for educational purpose and I accept no responsibility for others actions using the information found on this site.
Read this document about safety! http://www.pupman.com/safety.htm
What to look for
I knew from my friend that the TV would not turn on at all, so problem is already located to the power supply before even opening up the case.
Upon opening the TV and looking at the power supply board, there was no doubt where the problem was. Fuse is blown, the off-line driver IC is blown to pieces and a large filtering capacitor does not look too good, some leaking have occurred.
Capacitor was changed to a new used one with same capacitance but higher voltage rating, its usually when capacitors are used right on the edge of their ratings that they fail.
Fuse was easy to replace to one of same value.
Replacing the IC was a bit more tricky as the writing was blown away. Luckily the power supply board had some serial numbers, writing etc. that I could search for on google.
What I found was a vendor selling new power supply board and they had a high resolution picture uploaded with a zoom function, so it was easy for me to see that the IC was a TNY265.
Finding this on ebay turned out less fortunate, it would cost around 10 Euro for a new one shipped from Hong Kong.
So I looked up the data sheet and found out this IC was a part of a series of off-line drivers in a range of different power output capabilities. The TNY266 was just a little bit stronger than its smaller counter part, so I ordered one of those for 1 Euro from Hong Kong, now it was just to wait for that IC to arrive.
After replacing the IC the TV once again lives!
Here is a list of the different electrical equipment I have in my possession.
Likriktare ESP630, 2 – 57 VDC 25 A
Danica dual 0-30 VDC 2 A bench power supply
0 – 230 V, 12A, housed, single phase
0 – 260 V, 8A, housed with Volt/Ampere meters, single phase
0 – 230 V, 6A, housed stack of 3 for 400 V in Delta connection, three phased
0 – 230 V, 25A, housed stack of 3 with motor control for 400 V in Delta connection, three phased
Application BS-310S, 2 channel, 15 MHz, dual trace, analog
Rigol DS1054Z, 4 channel, 50 MHz (upgraded to 100 MHz), digital storage oscilloscope
Oscilloscope related equipment
Tektronix P5200 differential probe
Tektronix A6909, 2 channel high voltage isolator
Pearson Current monitor model 110 (5 kA)
Pearson Current monitor model 101 (50 kA)
Ion Physics Current Monitor (100 kA)
Hewlett Packard 3310A Function generator
Hewlett Packard 3325A Synthesizer / function generator
Other test equipment
Hewlett Packard 8903A Audio Analyzer
uTracer3 vacuum tube / valve tester
Handheld 30kV analouge voltmeter
Fluke 8842A table multimeter
Fluke 117 True RMS multimeter
Elma BM805 Digital Multimeter
LCR Meter, cheapest I could find off of Ebay, good accuracy to the price.
Weller WECP-20 soldering iron