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 47LV370S

Technical description and composition of the LG 47LV370S TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 47LV370S ZB
Chassis / Version: LD12B
Panel: LC470EUE (SD) (V1)
T-CON: TM120HZ TETRA 6870C-0368A
LED driver (backlight): integrated into PSU
PWM LED driver: FAN7930B
Power Supply (PSU): EAX62865401 / 8 LGP4247-11SLPB
PWM Power: FAN7930B (PFC), 3BR4765JZ (Standby), L6599AD (PWM Resonant)
MainBoard: EAX63557704 (0) - EBR73063508
IC MainBoard: Cpu: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C, Eeprom: 24C1024
Tuner: TDFQ-G001D
Specifications 47LV370S
LG 47LV370S
General repair guidelines for TV LCD LED
In the absence of any signs of operability, when the LG 47LV370S does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the EAX62865401 / 8 LGP4247-11SLPB TV power module. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself for no reason that you should look for when checking other elements of the primary circuit - electrolytic capacitors, PWM controller AN7930B (PFC), 3BR4765JZ (Standby), L6599AD (PWM Push-Pull), which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but the sound has other functions that work, there is a high probability of a malfunction of the display backlight LEDs or the LED driver (power converter for the backlight of the LC470EUE (SD) panel (V1)).
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
To open all transitions, several tens of volts or more are necessary, and it is best to use a current source for such purposes. A break in the line of LEDs connected in series cannot be detected with a multimeter or tester without disassembling the panel. In the open panel, it is necessary to check each LED. If your multimeter cannot open the LED transitions in forward bias, then see the presence of the PN transition of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
Motherboard EAX63557704 (0) - EBR73063508 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
When repairing an MB board, you need to check its components Cpu: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C, Eeprom: 24C1024. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating.
The TDFQ-G001D 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.
Remember! Attempts to self-repair by users of the LG 47LV370S TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
Service manual / schematic diagram ----------------> LG CHASSIS LD12B; MODEL: 47LV370S, 47LV370S-ZB, 47LV375G, 47LV375S, 47LV375T, 47LV375W, 47LV375G-ZC, 47LV375S-ZC, 47LV375T-ZC, 47LV375W-ZC



 The appearance of the MainBoard EAX63557704 is shown in the figure below:
EAX63557704
EAX63557704 can be used in TVs:
LG 37LV370S (Panel T370HW05 V.1), LG 42LV370S (Panel LC420EUN (SD) (V5)), LG 32LV3700 (Panel T315HW07 V.8), LG 42LV3700 (Panel LC420EUN (SD)(V3)), LG 47LV370S ZB (Panel LC470EUE (SD)(V1)), LG 32LV370S (Panel T315HW07 V.8).
PSU Advanced
The EAX62865401 / 8 LGP4247-11SLPB power module is designed using a Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC is a Step-Up Converter based on the AN7930B PWM controller, which evenly distributes high-frequency pulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device LG 47LV370S:
Installed matrix (LED-panel) LC470EUE (SD) (V1).
The matrix control uses the Timing Controller (T-CON) TM120HZ.
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 47LV370S TV are generated by the EAX62865401 power module or its analogs using FAN7930B (PFC), 3BR4765JZ (Standby), L6599AD (PWM Resonant) microcircuits.
MainBoard - the main board (motherboard) is an EAX63557704 module using Cpu chips: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C, Eeprom: 24C1024 and others.
The TDFQ-G001D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC470EUE-SDV1
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
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Posted By: FRANK at 02:34
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