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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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!

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Wednesday 6 March 2019

HARMAN KARDON SB30 - SB230 ACTIVE SOUND BAR WITH WIRELESS SUBWOOFER TROUBLESHOOTING AND POWER SUPPLY CIRCUIT DIAGRAM

HARMAN KARDON SB30 - SB230 Active Sound bar with wireless subwoofer troubleshooting and power supply circuit diagram

Category: Audio System Repair and Service

Contents of this article

Troubleshooting
Power supply circuit

HARMAN KARDON SB30 - SB230

Troubleshooting
The soundbar does not turn on (the Power LED is off):

# Check that the soundbar’s power cord is plugged into a working AC outlet.
# Check that the soundbar’s Power switch is in the “On” position.
# Check if the soundbar’s AC fuse has blown. See Soundbar Rear-Panel Controls and Connections: AC Fuse Holder, on page 4, for instructions on checking and changing the fuse.
# Check if the soundbar’s voltage selector switch is set in the incorrect position for the AC voltage in your area.

The subwoofer does not turn on (the Power LED is off):

# Check that the subwoofer’s power cord is plugged into a working AC outlet.
# Check that the subwoofer’s Power switch is in the “On” position.

There is no sound coming from both the soundbar and the subwoofer (their Power LEDs are amber or blue):
# Check that the soundbar is on (the Power LED is blue).
# Check that the cable connecting the TV or other source component to the soundbar is properly connected at both ends.
# Check that the soundbar is set to the correct input source (one white Status
LED glows for optical digital, two white Status LEDs for coaxial digital, and three white Status LEDs for analog) and that the input source device is playing an audio signal.
# Check that the system is not muted (when the system is muted, the soundbar’s Power LED flashes blue). If the system is muted, press the remote control’s Mute button to un-mute the system.
# Check that the soundbar’s volume is not turned all the way down.
There is no sound coming from just the subwoofer (the Power LED is amber or blue):

# Check that the Subwoofer Volume control is not turned all the way down (fully counterclockwise).
# Check that the Wireless Code switches on the subwoofer and soundbar are both set to the same setting number.
# Move the subwoofer closer to the soundbar. The maximum wireless operation distance is 50 feet (15.3m).
The soundbar’s sound is distorted:

# Check the source device to see if the distortion is coming from it and not from the soundbar.

The system’s sound is too quiet, even when the soundbar’s volume is turned all the way up:
# If the TV or source component is connected via a variable analog output, check its
instructions to be sure that the output is not turned down too low.
The bass output is not loud enough:

# Turn up the subwoofer’s Volume control.
# Move the subwoofer into a corner of the room.
# Move the subwoofer closer to the seating location.

L6599 High-voltage resonant controller

Device description
The L6599 is a double-ended controller specific for the resonant half-bridge topology. It provides 50 % complementary duty cycle: the high-side switch and the low-side switch are driven ON\OFF 180° out-of-phase for exactly the same time. Output voltage regulation is obtained by modulating the operating frequency. A fixed deadtime inserted between the turn-OFF of one switch and the turn-ON of the other one guarantees soft-switching and enables high-frequency operation. To drive the high-side switch with the bootstrap approach, the IC incorporates a high-voltage floating structure able to withstand more than 600 V with a synchronous-driven high-voltage DMOS that replaces the external fast-recovery bootstrap diode. The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator.
At start-up, to prevent uncontrolled inrush current, the switching frequency starts from a programmable maximum value and progressively decays until it reaches the steady-state value determined by the control loop. This frequency shift is non linear to minimize output voltage overshoots; its duration is programmable as well. The IC can be forced to enter a controlled burst-mode operation at light load, so as to keep converter's input consumption to a minimum.
IC's functions include a not-latched active-low disable input with current hysteresis useful for power sequencing or for brownout protection, a current sense input for OCP with frequency shift and delayed shutdown with automatic restart.
A higher level OCP latches off the IC if the first-level protection is not sufficient to control the primary current. Their combination offers complete protection against overload and short circuits. An additional latched disable input (DIS) allows easy implementation of OTP and/or OVP.
An interface with the PFC controller is provided that enables to switch off the pre-regulator during fault conditions, such as OCP shutdown and DIS high, or during burst-mode operation.

Applications
# LCD and PDP TV
# Desktop PC, entry-level server
# Telecom SMPS
# AC-DC adapter, open frame SMPS

POWER SUPPLY CIRCUIT

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