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 55LA660V

Technical description and composition of the LG 55LA660V TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 55LA660V ZA
Chassis / Version: LD33B
Panel: LC550EUH (PF) (P1)
LED backlight: 6916L1209B (55 V13 ART TV REV0.1 2 L-Type), 6916L1210B (55 V13 ART TV REV0.1 2 L-Type), 6922L-0069A
LED driver (backlight): integrated into PSU; 82.5V 0.9A
PWM LED driver: iW7011, R5F100BCAFP
MOSFET LED driver: TK15A20D, FDT86106LZ
Power Supply (PSU): EAX64905801 (2.0) REV3.0 LGP55-13LPB BD9TA628110010512 (1.5)
PWM Power: ICE3BR4765JZ (Standby), R2A20133D (PFC), SSC9527S
MOSFET Power: STD13NM60N (PFC), STD10NM60N
MainBoard: EAX64797003 (1.2) EBR76823179
IC MainBoard: CPU: LGE2122, NAND: SAA36403538 VER. 3.20.33, H5TQ4G63AFR x 2, H5TQ2G63AFR, NTP7513
Tuner: TDSQ-G601D (B) EBL61240503
Control: EBR76405601 (LA66 IR Ver1.1), WIFI: EAT61813901 TWFM-B006D
Technical Specifications 55LA660V
LG 55LA660V
General repair guidelines for TV LCD LED
If the LG 55LA660V does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the power supply module EAX64905801 (2.0) REV3.0 LGP55-13LPB BD9TA628110010512 (1.5). In some cases, only the processor power regulator may be faulty. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power key (s) STD13NM60N (PFC), STD10NM60N, which can be integrated with a PWM controller, or a separate field-effect transistor is detected. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
Sometimes the LG 55LA660V TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a possibility of a malfunction of the LED driver - power converter for the backlight LEDs of the LC550EUH (PF) panel (P1), or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the operability of the electrolytic capacitors of the filter by the power of the backlight unit.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
Diagnosis and repair of the EAX64797003 (1.2) EBR76823179 motherboard usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
When repairing an MB board, you need to check its CPU components: LGE2122, NAND: SAA36403538 VER. 3.20.33, H5TQ4G63AFR x 2, H5TQ2G63AFR, NTP7513. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating.
If a TDSQ-G601D (B) EBL61240503 tuner is suspected, it is first necessary to verify the correctness of the software, as well as the presence of the required power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Once again, remind users! Attempts to self-repair the LG 55LA660V TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram ------------>   LG CHASSIS LD33B; Model: 55LA6608, 55LA6678, 55LA660S, 55LA660V, 55LA662V, 55LA667S, 55LA667V.


PSU schematic diagram ------------>   LGP55-13LPB_EAY62811001_EAX64905801 Power supply



 The appearance of the MainBoard EAX64797003 is shown in the figure below:
EAX64797003
EAX64797003 can be used in TVs:
LG 42LA620V (Panel LC420DUE (SF)(U1)), LG 32LN570V (Panel LC320DUE (SF)(R1)), LG 50LA644V (Panel LC500EUN (SF)(F1)), LG 47LA660V (Panel LC470EUG (PF)(F1)), LG 47LA621V (Panel LC470DUE (SF)(U1)), LG 42LA644V (Panel LC420EUN (SF)(F2)), LG 39LA620V ZA (Panel T390HVJ01.0), LG 42LA621V ZD (Panel LC420DUE (SF)(U1)), LG 32LA621V ZD (Panel LC320DUE (SF)(U1)), LG 32LN655V (Panel LC320EUB (PF)(M1)), LG 42LA667V (Panel LC420EUH (PF)(P1) ), LG 47LN613V (Panel LC470DUE (SF)(R4)), LG 32LA667V ZB (Panel LC320EUB (PF)(P1)), LG 55LA660V ZA (Panel LC550EUH (PF)(P1)), LG 47LA620V ZA (Panel LC470DUE (SF)(U1)), LG 32LN613V ZB (Panel LC320DUE (SF)(R4)), LG 42LN655V ZB.BRUZLJU (Panel LC420EUH (PF)(M1)), LG 32LA644V ZA (Panel LC320EUN (SF)(F1)), LG 42LN613V (Panel LC420DUE (SF)(R4)), LG 47LA690V ZB (Panel LC47EUH (PF)(P1)), LG 47LA662V (Panel LC470EUG (PF)(F1)), LG 42LA645V 42LA645V-ZC.BRUYLJU (Panel LC420EUN (SF)(F3)), LG 32LA660V (Panel LC320EUB (PF)(P1)), LG 47LA644V 47LA644V-ZA (Panel LC470EUN (SF)(F2)), LG 50LA667S (Panel T500HVD02.1), LG 47LA691V (Panel LC470EUH (PF)(P1)), LG 32LA662V (Panel LC320EUB (PF)(P1)).
PSU Advanced
On the 55LA660V TV, the EAX64905801 power module is installed using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the R2A20133D PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the value of the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the device LG 55LA660V:
Installed matrix (LED-panel) LC550EUH (PF) (P1).
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the iW7011, R5F100BCAFP PWM controller. As the power elements of the LED driver, keys of the type TK15A20D, FDT86106LZ are used.
The necessary supply voltages for all nodes of the LG 55LA660V TV are generated by the EAX64905801 power supply module or its analogs using ICE3BR4765JZ (Standby), R2A20133D (PFC), SSC9527S microcircuits and power switches of the STD13NM60N (PFC), STD10NM60N type.
MainBoard - the main board (motherboard) is an EAX64797003 module using CPU chips: LGE2122, NAND: SAA36403538 VER. 3.20.33, H5TQ4G63AFR x 2, H5TQ2G63AFR, NTP7513 and others.
Tuner TDSQ-G601D (B) EBL61240503 provides the reception of television programs and tuning to channels.
Posted By: FRANK at 07:36
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