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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Friday 14 February 2020

REPAIR / SERVICING TV LG 32LA643V

Technical description and composition of the LG 32LA643V TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 32LA643V
Chassis / Version: LD31B / LC36B / LL36B
Panel: LC320EUN (SF) (F1)
LED backlight: 32 V13 Edge Rev. 0.2 1 6920L-0001C; 6922L-0059A
T-CON: LC470EUN-SFF1, P / N: 6870C-0432A; TL2354EP, TPS65178A, TPS65198
LED driver (backlight): 6917L-0121A
PWM LED driver: SW5519
MOSFET LED driver: FDD850N10L
Power Supply (PSU): EAX64907901 (2.4) 2013.04.03
PWM Power: FA5760N, NCP3170A, LM2903
MOSFET Power: 6N12013, K12A60W, MDD3754
MainBoard: EAX64891306 (1.1)
IC MainBoard: Cpu: ENGINE LGE2121-MS Spi Flash: MXIC MX 25L8006B, Eeprom: 4256BRP (24C256)
Tuner: TDSQ-G601D (B)
Control: AKB73715694
Specifications 32LA643V
LG 32LA643V
General repair guidelines for TV LCD LED
Failures of the EAX64907901 power supply module (2.3) can be expressed in different ways, for example, the LG 32LA643V does not turn on at all and the control lights on its front panel do not light up and do not blink, and there are no signs of operability. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If the LG 32LA643V does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the LC320EUN (SF) (F1) panel is likely. LEDs or their power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the backlight assembly.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
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 one LED slightly if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode.
The motherboard EAX64891306 (1.1) must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements Cpu: ENGINE LGE2121-MS Spi Flash: MXIC MX 25L8006B, Eeprom: 4256BRP (24C256). BGA chip malfunctions are usually easy to detect by warming up.
The failure of the TDSQ-G601D (B) tuner is established after checking the software and all supply voltages at its terminals.
Attention to the owners! Attempts to self-repair the TV LG 32LA643V are not recommended by the manufacturer and can lead to serious negative consequences!

SCHEMATIC MANUAL --------------------> LG CHASSIS LD31B MODEL 32LA643V 32LA643V-ZB.

WITH  MAIN EAX64891306(1.1)2013.03.15 C.J.W - H5TQ1G63EFR X2, 24C256, 25L8006E, H27U1G8F2CTR (SAA36254751 J.VER.3.13.86), LCX244, TPS65281, TPS54319TRE, STA380BWF.


 The appearance of the MainBoard EAX64891306 is shown in the figure below:
EAX64891306
EAX64891306 can be used in TVs:
LG 32LN540V (Panel LC320DUE (SF)(R1)), LG 42LN542V-ZD (Panel LC420DUE SFR3), LG 32LN541V (Panel LC320DUE (SF)(R1)), LG 42LA615V (Panel LC420DUE (SF)(U2) ), LG 32LA615V (Panel LC320DUE (SF)(U2)), LG 42LN540V (Panel LC420DUE (SF)(R1)), LG 42LN541V (Panel LC420DUE (SF)(R1)), LG 47LN540V (Panel LC470DUE (SF)(R1)), LG 32LB530U ZA (Panel LC320DXE (SG)(R1)), LG 39LN540V (Panel HC390DUN-VCFP1-11XX), LG 32LA643V (Panel LC320EUN (SF)(F1)), LG 32LN542V (Panel LC320DUE SF R1), LG 47LA615V (Panel LC470DUE (SF)(U2)), LG 47LA643V ZB (Panel LC470EUN (SF)(F2)), LG 32LN541U ZB (Panel HC320DXN-VHFP1 - 21XX / HC320DXN-VHFPA - 21XX), LG 32LN536U (Panel NC320DXN (SA)(P1)), LG 37LN541U (Panel LC370DXE (SF)(R1)).
The appearance of the power supply
Main features of the device LG 32LA643V:
Installed matrix (LED-panel) LC320EUN (SF) (F1).
The matrix control uses the Timing Controller (T-CON) LC470EUN-SFF1.
The LED driver 6917L-0121A is used to power the backlight LEDs, it is controlled by the PWM controller SW5519. As the power elements of the LED driver, keys of the FDD850N10L type are used.
The necessary supply voltages for all nodes of the LG 32LA643V TV are generated by the EAX64907901 power supply module or its analogs using FA5760N, NCP3170A, LM2903 microchips and 6N12013, K12A60W, MDD3754 power switches.
MainBoard - the main board (motherboard) is an EAX64891306 module, using Cpu chips: ENGINE LGE2121-MS Spi Flash: MXIC MX 25L8006B, Eeprom: 4256BRP (24C256) and others.
The TDSQ-G601D (B) tuner allows you to receive television programs and tune to channels.
Information from an alternative source:
LG 32LA643V-ZD Chassis LD31B
Panel Type (Matrix): LC320EUN (SF) (F1)
Motherboard:EAX64891306(1.1)2013.03.15 C.J.W, H5TQ1G63EFR X2, 24C256, 25L8006E, H27U1G8F2CTR стикер:SAA36254751 J.VER.3.13.86, LCX244, TPS65281, TPS54319TRE, STA380BWF, Tuner: EBL61240503 TDSQ-G601D(B)
T-con: LC470EUN-SFF1 P/N: 6870C-0432A, TL2354EP, TPS65178A, TPS65198
LED Driver: 6917L-0121A, SW5519, FDD850N10L
PSU: EAX64907901 (2.4) 2013.04.03, 5760 6N12013, LM2903, 3170A, K12A60W X2, MDD3754 x2
Remote control: AKB73715694
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUN-SFF1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.9 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 350 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Posted By: FRANK at 05:23
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