Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

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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..............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!

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Monday 8 April 2019

PHILIPS PSU SD21 (3122 427 24420) - PLCD170P2 : PHILIPS 26PF4310/10, 26PF7521D/10, 26PF3320/10 SMPS SCHEMATIC

Philips PSU SD21(3122 427 24420) - PLCD170P2: Philips 26PF4310/10, 26PF7521D/10, 26PF3320/10 SMPS schematic

12V output
Short-circuit protected by 2.5A fuse
Over voltage protection when output voltage is more than 40% above nominal value.

Vaudio (+18V) output
Short-circuit protected by 2.5A fuse
Over voltage protection when output voltage is more than 40% above nominal value.

24V output
Short-circuit proof with auto-restart
Over voltage protection when output voltage is more than 40% above nominal value.

Vbolton
Short-circuit protected by 2.5A fuse
Over voltage protection when output voltage is more than 40% above nominal value.

+3V3STBY output
Short-circuit proof with auto-restart
Over voltage protection when output voltage is more than 40% above nominal value.

Cooling
Convection cooling cools the unit; therefore forced cooling is not required.

Consumption
STANDBY Mode: Less than 1 Watt at 230 Vac.
Normal Mode: Nominal Power =TBD W at 230 Vac.

Output specification

The following notes are applicable for the power outputs.
1. Nominal current absorption is defining the nominal worst-case unit operating temperature. The nominal current absorption defines the maximum allowed component temperature for compliance according the safety requirements.
2. The tolerances include line and load regulations.

The ripple is a peak-to-peak value measured in a bandwidth from 0 to 20 MHz.

The noise is a peak-to-peak value measured above 20 MHz.
3. Tested by dc loading side parallel with a 10 µF Electrolytic Capacitor and a 0.1 µF Ceramic Capacitor.
Power for Vamb only available when no power is requested on the Vbolton.
4. The input power will be less than 1 W at 230 Va c in this situation.
5. The maximum current is allowed for a period of 300 sec. The nominal current shall be the average current over any period of 3600 sec.

This LCD Power Supply Unit (PLCD150) is a total power solution providing all voltages and powers required by LCD TV applications.

Signal Levels
The control signals shall be driven by open collector / open drain type circuits (or equivalent). The drive requirements are:
3V3 Logic: Open Collector: +2k2 pull-up resistor to +3.3 V.

Power Down Signal (POWER_DOWN)
The unit will generate a POWER_DOWN signal when the mains input is removed. POWER_DOWN will go from high to low at least 15 ms before any of the output
voltages starts collapsing.

The unit is controlled via a digital input: STANDBY# at the secondary side:

Schematic