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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Monday, 2 March 2020

REPAIR / SERVICING TV LG 47LM585T

Technical description and composition of the LG 47LM585T TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 47LM585T
Chassis / Version: LD21B / LC21B
Panel: LC470EUE (SE) (U1)
LED backlight: 6922L-0017A, 6922L-0018A, 6920L-0131C 48Led
T-CON: 6870C-0418A
LED driver (backlight): integrated into PSU
PWM LED driver: 2843B, GPCD2430A, 100BCA148AZOH
MOSFET LED driver: 86106LZ
Power Supply (PSU): EAX64310401 (1.4) LGP4247H-12LP8
PWM Power: FAN7930 (PFC), STR-A6059H (Stb), L6599AD (PWM)
MOSFET Power: 18NM60N, 13NM60
MainBoard: EAX64317403 (1.0) EBR75084304
IC MainBoard: CPU: LGE2111A-T8, Nand: NAND01GW3B2CN6E, DDR: H5TQ1G63DFR-H9C, SPI Flash: W25Q80BV
Tuner: TDSQ-G001D
Control: IR: EBR74986702 LM35-55 MB32B00 1BF-3010B
Specifications 47LM585T
LG 47LM585T
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 47LM585T does not turn on, does not respond to buttons and remote control, indicators on the front panel do not light up and do not blink.
With such manifestations, the EAX64310401 power supply module usually fails. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches (18NM60N, 13NM60) and rectifier diodes of the converters for a short circuit probability.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) FAN7930 (PFC), STR-A6059H (Stb), L6599AD (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX64317403 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). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU: LGE2111A-T8, Nand: NAND01GW3B2CN6E, DDR: H5TQ1G63DFR-H9C, SPI Flash: W25Q80BV. Defective components should be replaced.
If the TV works normally from external devices, but does not tune into television channels, the TDSQ-G001D tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention! For users and owners of 47LM585T TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual and schematic diagram ------------------------->   LG CHASSIS LD21B; MODEL 47LM580S, 47LM580T, 47LM585S, 47LM580S/580T-ZA 47LM585S-ZD

  schematic diagram ------------------------->   EAX64310401 Power supply



The appearance of the MainBoard EAX64317403 is shown in the figure below:
EAX64317403
EAX64317403 can be used in TVs:
LG 32LM580S (Panel LC320EUN (SE)(F2)), LG 32LS5610 (Panel T320HVN01.0), LG 42LM580S ZA (Panel LC420EUE (SE)(F1)), LG 42LS5620 (Panel T420HVN01.1), LG 32LS5600 (Panel T320HVN01.0), LG 42LM585S -ZD (Panel LC420EUE (SE)(F1)).
The appearance of the power supply
Main features of the device LG 47LM585T:
Installed matrix (LED panel) LC470EUE (SE) (U1).
The matrix control uses the Timing Controller (T-CON) 6870C-0418A.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a PWM controller 2843B, GPCD2430A, 100BCA148AZOH. As power elements of the LED driver, keys of type 86106LZ are used.
The necessary supply voltages for all nodes of the LG 47LM585T TV are generated by the EAX64310401 power module or its analogs using FAN7930 (PFC), STR-A6059H (Stb), L6599AD (PWM) microcircuits and power switches of the 18NM60N, 13NM60 type.
MainBoard - the main board (motherboard) is an EAX64317403 module using CPU chips: LGE2111A-T8, Nand: NAND01GW3B2CN6E, DDR: H5TQ1G63DFR-H9C, SPI Flash: W25Q80BV and others.
The TDSQ-G001D tuner provides TV reception and channel tuning.


Posted By: FRANK at 07:04
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