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 55LA690V

Technical description and composition of the LG 55LA690V TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 55LA690V
Chassis / Version: LD33B
Panel: LC550EUH (PF) (P1)
LED backlight: 6922L-0069A, 6920L-0001C L / R-Type
LED driver (backlight): integrated into PSU
PWM LED driver: iW7011, R5F100BCAFP
MOSFET LED driver: TK15A20D, FDT86106LZ
Power Supply (PSU): EAX64905801 (1.8) REV1.0 LGP55-13LPB
PWM Power: ICE3BR4765JZ (Stb), R2A20133D (PFC), SSC9527S
MOSFET Power: STD13NM60N (PFC), STD10NM60N
MainBoard: EAX64797003 (1.2) EBR76823177
IC MainBoard: CPU: LGE2122, NAND: SAA36403538 VER. 3.20.33, H5TQ4G63AFR, H5TQ2G63AFR, NTP7513
Tuner: SQ-G601D (B)
Control: IR: EBR76405602, WIFI: TWFM-B006D EAT61813901
Technical Specifications 55LA690V
LG 55LA690V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 55LA690V does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, the EAX64905801 power supply module usually fails. It is necessary to measure its output voltages and, if they are absent, check the power switches (STD13NM60N (PFC), STD10NM60N) and rectifier diodes for the probability of short circuit in the converters.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damper circuits, or negative feedback elements in the stabilization circuit. PWM controllers ICE3BR4765JZ (Stb), R2A20133D (PFC), SSC9527S, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- 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.
The most likely in these cases is a malfunction of the LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX64797003 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). In cases of attempts to repair the MB board (SSB), it is necessary to check the health of its elements - CPU: LGE2122, NAND: SAA36403538 VER. 3.20.33, H5TQ4G63AFR, H5TQ2G63AFR, NTP7513 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
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 voltage of the tuner SQ-G601D (B) and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners and users of the LG 55LA690V TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual / schematic diagram ------------>   LG 55LA690V Chassis LD33B 

 55LA690S, 55LA690V, 55LA691S, 55LA691V, 55LA692V, 55LA6908, 55LA6918, 55LA6928 -Z*


 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)).
The appearance of the power supply
Main features of the device LG 55LA690V:
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 55LA690V TV are generated by the EAX64905801 power module or its analogs using ICE3BR4765JZ (Stb), 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, H5TQ2G63AFR, NTP7513 and others.
Tuner SQ-G601D (B) provides the reception of television programs and tuning to channels.
Posted By: FRANK at 07:41
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