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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Wednesday 6 March 2019

SAMSUNG PS42D5S TROUBLESHOOTING - POWER SUPPLY WORKING – SMPS VOLTAGES - NO POWER - NO SOUND - RELAY CHATTERING - PLASMA TELEVISION REPAIR AND SERVICE

SAMSUNG PS42D5S Troubleshooting - Power supply working – SMPS Voltages - No Power - No sound - Relay Chattering - Plasma television Repair and Service

Category: Plasma Television Repair and Service

Contents of this article

Troubleshooting
SMPS power supply Working
SMPS power supply Voltages

SAMSUNG PS42D5S

First Checklist for Troubleshooting
1. Check the various cable connections first.
# Check to see if there is a burnt or damaged cable.
# Check to see if there is a disconnected cable connection or a connection is too loose.
# Check to see if the cables are connected according to the connection diagram.
2. Check the power input to the Video Board.
3. Check the voltage in and out between the SMPS > Video Board, between the SMPS > X, Y Drive Board, and between the Logic Boards.

No Power
Symptom
# The LEDs on the front panel do not work when connecting the power cord.
# The SMPS relay does not work when connecting the power cord.
# The power of the unit seems to be out of order.
Check Points

The SMPS relay or the LEDs on the front panel do not work when connecting the power cord if the cables are improperly
connected or the Video Board or SMPS is out of order. In this case, check the following:
# Check the internal cable connection status inside the unit.
# Check the fuses of each part.
# Check the output voltage of SMPS.
# Replace the Video Board.

When the unit is repeatedly turned on and off
Symptom

# The SMPS relay is repeatedly turned on and off.
Check Points
In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the SMPS.
# Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if each voltage output is correct.
# If the symptom continues even when SMPS is operated alone, replace the SMPS.
# If the symptom is not observed when operating the SMPS alone, find any defective ASSYs by connecting the cables one by one.

No Picture (When audio is normal)
Symptom

# Audio is normal but no picture is displayed on the screen.
Check Points
# This may happen when the Video Board is normal but the X, Y Drive Board, Logic Board, or Y Buffer Board is out of order.
# The output voltage of the Main SMPS or the DC-DC SMPS is out of order.
# This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.

No Sound
Symptom

# Video is normal but there is no sound.

Check points
# When the speaker connectors are disconnected or damaged.
# When the sound processing part of the Video Board is out of order.
# Speaker defect.
# When setting the volume to 0 (Nonsense).

Main SMPS

Circuit Description
1. Outline (PDP 42inch/50inch SMPS)
Considering various related conditions, the switching regulator with good efficiency and allowing for its small size and light weight was used as the power supply for PDP 42inch(Schubert)/50inch(Strauss), VS requiring high power consumption Asymmetrical Half Bridge converter and flyback converter. To comply with the international harmonics standards and improve the power factor, active PFC(Power Factor Correction) was used to rectify AC input into +400V DC output, which in turns used as input to the switching regulator.
2. Input
The power supply shall be capable of supplying full rated output power over free voltage ranges that are rated 100 VAC - 240 VAC RMS nominal. Operating voltage : 90 VAC - 264 VAC.
The power supply must be able to start up under peak loading at 90V AC. The power supply shall automatically recover from AC power loss. (Note that nominal voltages for test purposes are considered to be with +/- 1.0V of nominal). STD_5V & Vpr2(3.3V) is a SELV standby voltage that is always present when AC mains voltage present.

3. Output

Output Name	Output Voltage	Output Current(Max
VS	+190V ~ 220V (210V)	2.0A
VA	+60V ~ 80V (70V)	3.0A
D5.3V	+5.3V	5.0A
A6.5V	+6.5V	3.0A
FAN_9V	+9V	0.2A
VG	+15V	1.0A
D12V	+12V	1.5A
A12V	+5.3V	0.5A
18VAMP	+18V	2.5A
VT	+33V	0.006A
STD_5V	+5V	1.0A

4. Over Voltage Protection

The over voltage sense circuitry and reference shall reside in package that are separate and distinct from the regulator control circuitry and reference. No single point fault shall be able to cause a sustained over voltage condition on any of all outputs.
5. Short Circuit and Over current Protection
An output short circuit is defined as output impedance of less than 300mohms. The power supply shall shutdown and latch off for shorting VS DC rails to return. Shorts between main output rails and STD_5V shall not cause any damages to the power supply. The power supply shall either shutdown and latch off for shorting is removed, the P/S shall recover. The power supply shall be capable of withstanding a continuous short-circuit to the output without damage or over stress to the unit.