750+ Watt Turbo Fan Cluster Project From a Dell PowerEdge M1000E Server

This is 9! 12V/7A server fans built into a fan cluster with handles! It is time to wreck some havoc and play with fire and …

Server PSU Hack – HP DPS-800GB A, 12VDC 1000W

A guide on how to make the, HP DPS-800GB Rev. A, server power supply run outside of its server enclosure. A simple bridge between pin …

Dell PowerEdge M1000E Blade Server Teardown

I came by a discarded full size Dell PowerEdge M1000E server rack. Full SAN, 2 large blade servers, 4 or 6 backbone switches, all power …

DIY 250W LED Flood Light for High Speed Filming, Part 3 of 3.

This is part 3 of my DIY LED flood light that is going to be used for high speed video filming with the FPS1000HD camera. …

HP T620 Thin Client – PSU Hack And Windows PC Modification

The HP T-620 Thin Client is a powerful little machine, that with ease can be hacked into using a random 19VDC PSU and run Windows …

Chinese 1800 Watt Induction Heater, Boxed Up With Server PSU + Test

The 1800W Induction Heater is now boxed up with all power supplies, water cooling, foot switch, current meter and insulated work coil. All information you …

Teardown of a Eaton PowerWare 60kVA UPS system

This is the teardown of a large 2x 60 kVA Eaton UPS system, first is the teardown video and below are some pictures and a …

Power supplies

3 phase 13A Lübcke variac

3 phase 13A Lübcke variac
Introduction On a junk yard I found a badly damaged enclosure containing a 3 phase 13 A variac, 10 kVA isolation transformer and 6 large stud diodes in a 3 phase full bridge rectifier configuration....

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Merlin Gerin PM700 power meter

Merlin Gerin PM700 power meter
Introduction I wanted a small unit to plug into, or between two, mains feed cables to measure voltage, RMS current, power factor and harmonic distortion. I found this Merlin Gerin PM700 power meter at a...

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27″ LCD TV repair

Introduction

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.

 

Safety

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!

 

My Equipment

Here is a list of the different electrical equipment I have in my possession.

Power Supplies

Likriktare ESP630, 2 – 57 VDC 25 A

Danica dual 0-30 VDC 2 A bench power supply

 

Variacs

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

 

Oscilloscopes

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)

 

Signal generators

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

 

Multimeters

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.

 

Soldering

Weller WECP-20 soldering iron