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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Wednesday, 4 March 2020

REPAIR / SERVICING TV LG 50LB653V

Technical description and composition of the LG 50LB653V TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 50LB653V
Panel: LC500DUH (FG) (P1)
LED backlight: LG lnnotek DRT 3.0 50_A type / 50_B type Rev01 # 1_140107
T-CON: 6870S-1763B, 6870S-1764B
LED driver (backlight): integrated into PSU; 117V 230mA (47 inch)
PWM LED driver: BL0202B
MOSFET LED driver: AP9561AGH
Power Supply (PSU): EAX65423801 (2.1), LGP474950-14PL2
PWM Power: MAP8800 (PFC), FA6A01N, NR134S
MOSFET Power: K7A60W
MainBoard: EAX65384003 (1.2) EBR78515108 SAA37219524 SAA36900716
IC MainBoard: CPU: LG1311, DRAM: H5TQ4G63AFR-PBC, EEPROM: AT24C256C, EMMC: THGBMAG6A2JBAIR
Tuner: TDJM-G101D EBL1400501
Control: Remote: AKB73756565, WiFi: 2703H-LGSBW41
Specifications 50LB653V
LG 50LB653V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 50LB653V does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Often in such cases, the EAX65423801 power module is faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (K7A60W) and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually operate abnormally in short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) MAP8800 (PFC), FA6A01N, NR134S, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX65384003 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). When repairing an MB board, you need to check its CPU components: LG1311, DRAM: H5TQ4G63AFR-PBC, EEPROM: AT24C256C, EMMC: THGBMAG6A2JBAIR. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the power supply of the tuner TDJM-G101D EBL1400501 and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
We recommend the owners of the 50LB653V TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!

 Service manual / schematic diagram ------------>   LG CHASSIS LD42B MODEL: 42LB65** 42LB65**-Z*.

  manual  ------------>   WiFi  LG Wi-Fi Module LGSBW41

 The appearance of the MainBoard EAX65384003 is shown in the figure below:
EAX65384003
EAX65384003 can be used in TVs:
LG 47LB650V ZE (Panel LC470DUH (FG) (P2)), LG 42LB631V ZL (Panel LC420DUH (FG) (A1)), LG 39LB650V (Panel T390HVJ01.2), LG 55LB673V ZB (Panel LC550DUH (PG)(F1)), LG 47LB677V (Panel LC470DUH (FG)(F1)), LG 42LB673V (Panel LC420DUH (PG)(F1)), LG 47LB673V (Panel LC470DUH (PG)(F1)), LG 32LB652V 32LB652V-ZA.BRUWLDU (Panel LC320DUH (FG)(P2)), LG 50LB653V (Panel LC500DUH (FG)(P1)), LG 42LB652V 42LB652V-ZA.BRUWLJU (Panel LC420DUH (FG)(P2)), LG 55LB720V 55LB720V-ZG.BRUWLJU (Panel LC550DUH (PG)(F1)).
The appearance of the power supply
Main features of the device LG 50LB653V:
Installed matrix (LED-panel) LC500DUH (FG) (P1).
The matrix control uses the Timing Controller (T-CON) 6870S-1763B.
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the BL0202B PWM controller. As power elements of the LED driver, keys of the type AP9561AGH are used.
The necessary supply voltages for all nodes of the LG 50LB653V TV are generated by the EAX65423801 power module or its analogs using MAP8800 (PFC), FA6A01N, NR134S microchips and K7A60W type power switches.
MainBoard - the main board (motherboard) is an EAX65384003 module using CPU chips: LG1311, DRAM: H5TQ4G63AFR-PBC, EEPROM: AT24C256C, EMMC: THGBMAG6A2JBAIR and others.
Tuner TDJM-G101D EBL1400501 provides the reception of television programs and tuning to channels.


Posted By: FRANK at 07:11
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