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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..............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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Tuesday 3 March 2020

REPAIR / SERVICING TV LG 47LV570S

Technical description and composition of the LG 47LV570S TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 47LV570S
Chassis / Version: LD12D / E
Panel: LC470EUF (SD) (A1)
T-CON: 6870C-0358A (LVDS 51pin + 41pin)
LED driver (backlight): integrated into PSU
PWM LED driver: FAN7930B
Power Supply (PSU): EAX62865401 / 8 LGP4247-11SLPB
PWM Power: L6599AD, FAN7930B (PFC), 3BR4765JZ (Standby)
MainBoard: EAX64405401 (0)
IC MainBoard: LGE35230, M24C16, K4B2G1646C-HCKO, TH58DVG4S0ETA20, NTP7400L, F0514A
Tuner: TDFR-G256D
Specifications 47LV570S
LG 47LV570S
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 47LV570S TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
In some of these cases, the main switching power supply, the EAX62865401 module, is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers L6599AD, FAN7930B (PFC), 3BR4765JZ (Standby), in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the EAX64405401 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - LGE35230, M24C16, K4B2G1646C-HCKO, TH58DVG4S0ETA20, NTP7400L, F0514A with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
The TDFR-G256D tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention to users! Self-repair of the LG 47LV570S TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!




The appearance of the MainBoard EAX64405401 is shown in the figure below:
EAX64405401
EAX64405401 can be used in TVs:
LG 32LV571S (Panel LC320EUD (SD) (F3)), LG 42LV571S ZA (Panel LC420EUF (SD) (A1)).
The appearance of the power supply
Main features of the device LG 47LV570S:
Installed matrix (LED-panel) LC470EUF (SD) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0358A.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the FAN7930B PWM controller.
The necessary supply voltages for all nodes of the LG 47LV570S TV are generated by the EAX62865401 power supply module or its analogs using L6599AD, FAN7930B (PFC), 3BR4765JZ (Standby) microcircuits.
MainBoard - the main board (motherboard) is an EAX64405401 module using LGE35230, M24C16, K4B2G1646C-HCKO, TH58DVG4S0ETA20, NTP7400L, F0514A, and others microcircuits.
The TDFR-G256D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC470EUF-SDA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 47 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 1039.68x584.82 mm
Response Time: 6 (G to G)
Lamp Type: WLED
Posted By: FRANK at 02:37
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