REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday, 2 April 2019

AKAI A1211 DVD PLAYER - SMPS SCHEMATIC AND TROUBLESHOOTING (TEA1523) - POWER CONTROL IC

AKAI A1211 DVD PLAYER - SMPS SCHEMATIC and TROUBLESHOOTING (TEA1523) - Power Control IC

SMPS (Power Supply) - Working principles.
  The mains power (220V AC) fed from N1 is filtered through C1, L1, C2 and L2 then rectified by D1, D2, D3 and D4 and generates an output at 00VDC. This 300VDC fed to T1 (pin2, pin4) which connects to TEA1523P (pin2), then TEA1523Pwill automatically generate a 50 KHz square waveform, this 50 KHz square waveform controls the ON/OFF between TEA1523Ppin2 and the ground. In normal condition, T1 primary (between pin2 and pin4) will create a 50KHz square waveform which is controlled by TEA1523P , this signal then fed to T1 and generates 2 different potential voltages of 12V and 5V between pin17, pin14 and pin16, pin14 respectively . The 12VDC and 5VDC then rectified by D7, D8, and D9 and then filtered by L3, L4, L5, C9, C10 and C1 1. The feedback voltage is controlled by Ic3 TL431 and IC2 PC817. When the output voltage is higher than 5V , the voltage at TL431(2.5V) is compared with R10 and send out a signal to 5L0380R, the output square waveform then will change to adjust the output voltage, this acts as a voltage stabilizer.
SMPS PROGRAMMABLE SHUNT REGULATOR.
  The TL431/TL431A are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors. These devices have a typical dynamic
output impedance of 2.0W  Active output circuitry provides a very sharp turn-on characteristic making these devices excel lent replacement for zener diodes in many applications.
POWER SUPPLY FAULT TRACING FLOW CHART
CLICK ON THE PICTURES TO MAGNIFY
Posted By: FRANK at 01:11
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