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 49LB552V

Technical description and composition of the LG 49LB552V TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 49LB552V ZA
Chassis / Version: LC43B / LD43B / LB43T
Panel: LC490DUE (FG) (A6)
T-CON: V14 60HZ 1G1D SW V0.1 p / n 6870c-0481a; TL2375EP, SW5084A, T08 / 4222
LED driver (backlight): integrated into PSU
PWM LED driver: BL0202B
MOSFET LED driver: AP9561AGH
Power Supply (PSU): EAX65423801 (2.1)
PWM Power: MAP8800 (PFC), FA6A01N (PWM Resonant), NR134S (PWM Step-down)
MOSFET Power: K7A60W
MainBoard: EAX65388005 (1.0)
IC MainBoard: LGE2132 / A7MKN66C, H27U1G8F2CT, LCX244, A8303, TAS5733, TPS65282
Tuner: TDJM-G101D EBL61400501
Control: AKB73715669
Specifications 49LB552V
LG 49LB552V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 49LB552V TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
In most of these cases, a malfunction is detected in the EAX65423801 power module. It is necessary to verify the presence of secondary voltages and, if they are absent, check the power switches (K7A60W) and rectifier diodes for a probable short circuit. The performance of the PFC converter is usually checked by the presence of an increased voltage (380-400V) on the electrolytic capacitor of the network rectifier in operating mode.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback.
Chips PWM-regulators (PWM) MAP8800 (PFC), FA6A01N (PWM Resonant), NR134S (PWM Step-down) are checked by replacing with a known-good or new one.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX65388005 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 board (SSB), you need to check the health of its elements - LGE2132 / A7MKN66C, H27U1G8F2CT, LCX244, A8303, TAS5733, TPS65282. Defective components should be replaced.
If the TV works normally from external devices, but does not tune into television channels, the TDJM-G101D EBL61400501 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 to users! Independent repair of the TV LG 49LB552V without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Service manual / schematic diagram ----------------> LG 49LB552V Chassis LC43B/LD43B/LB43T.

CHASSIS : LD43B/LD44B; MODEL : 49LB55**, 49LB55**-Z*, 49LB552V, 49LB552V-TB


 The appearance of the MainBoard EAX65388005 is shown in the figure below:
EAX65388005
EAX65388005 can be used in TVs:
LG 32LB561U (Panel NC320DXN VSBP1), LG 42LB563V (Panel LC420DUE (FG)(A3)), LG 32LB565U ZQ (Panel LC320DXE (FG)(A3)), LG 42LB561V ZE (Panel LC420DUE (FG)(A3)), LG 49LB552V ZA (Panel LC490DUE (FG)(A6) ), LG 42LB565V (Panel LC420DUE (FG)(A3)), LG 32LB628U 32LB628U-ZB.BRUWLDU (Panel LC320DXE (FG)(P2)), LG 47LB561V-ZE 47LB561V (Panel LC470DUE( FG)(A3)).
The appearance of the power supply
Main features of the device LG 49LB552V:
Installed matrix (LED-panel) LC490DUE (FG) (A6).
The matrix control uses the Timing Controller (T-CON) V14.
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 49LB552V TV are generated by the EAX65423801 power module or its analogs using MAP8800 (PFC), FA6A01N (PWM Resonant), NR134S (PWM Step-down) microcircuits and K7A60W power switches.
MainBoard - the main board (motherboard) is an EAX65388005 module, using chips LGE2132 / A7MKN66C, H27U1G8F2CT, LCX244, A8303, TAS5733, TPS65282 and others.
Tuner TDJM-G101D EBL61400501 provides the reception of television programs and tuning to channels.
Posted By: FRANK at 02:56
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