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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Thursday 20 February 2020

REPAIR / SERVICING TV LG 32LV3400

Technical description and composition of the LG 32LV3400 TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 32LV3400 ZG
Chassis / Version: LT01M
Panel: LC320EUN (SD) (V2)
T-CON: 6870C-0368A V6 32/42/47 FHD TM120HZ_TETRA
LED driver (backlight): KLS-E320RABHF06D
PWM LED driver: FAN7930B L6599AD
Power Supply (PSU): EAX64127201 / 11
PWM Power: 3BR4765JZ (Standby), FAN7930B (PFC), L6599AD
MOSFET Power: 7NM60N
MainBoard: EAX64272803 (0)
IC MainBoard: LGE2111-T8, 24C08K, 25Q80BVSIG, NTP-7400L, AP7173 H5TQ1G63DFR, LCX244F204, AP2191D, AS324M-E1, MAX3232C
Tuner: TDSS-G101D
Control: AKB72915244
Specifications 32LV3400
LG 32LV3400
General repair guidelines for TV LCD LED
In the absence of any signs of operability, when the LG 32LV3400 does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the TV power supply EAX64127201 / 11. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
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 3BR4765JZ chip from the manufacturer.
If the LG 32LV3400 does not have an image, but there is sound, there may be a malfunction of the backlight LEDs of the LC320EUN (SD) (V2) panel or their power converter - LED driver.
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
To open all transitions, several tens of volts or more are necessary, and it is best to use a current source for such purposes. A break in the line of LEDs connected in series cannot be detected with a multimeter or tester without disassembling the panel. In the open panel, it is necessary to check each LED. If your multimeter cannot open the LED transitions in forward bias, then see the presence of the PN transition of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
The motherboard EAX64272803 (0) 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.
In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - LGE2111-T8, 24C08K, 25Q80BVSIG, NTP-7400L, AP7173 H5TQ1G63DFR, LCX244F204, AP2191D, AS324M-E1, MAX3232C with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
The TDSS-G101D tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention to users! Self-repair of the LG 32LV3400 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC MANUAL -----------------------> LG 32LV3400 Chassis LT01M.

MODEL LG 32LV3400-ZG.BRUDLJU Chassis: L*01M, Panel: T315HW07 V.8
31T14-S05 T315HW07 V7 XR, 31T14-S04 T315HW07 V7 XL,
LED Diver: T315HW07 V8 31T14-D06,
LED Backlight: 73.31T14.004-5-SK1, LG INNOTEK 32INCH 5630PKG 40EA Rev0.0 110104,
Power: EAX64127201/10 LGP32-11PUC1 PSLC-L015A 3PAGC10057A-R

 The appearance of the MainBoard EAX64272803 is shown in the figure below:
EAX64272803
EAX64272803 can be used in TVs:
LG 42LK450-TG (Panel V420H2-L05), LG 32LK430 ZG (Panel LC320WUN (SC)(A2)), LG 42LK430 (Panel LC420WUE (SC)(A2)), LG 42CS560 ZD (Panel LC420WUE (SC)(A3)), LG 32LV3400 ZG (Panel LC320EUN (SD)(V2)), LG 32CS560 (Panel LC320WUN (SC)(A2)), LG 32LK455 32LK455C (Panel EAX64272803).
PSU Advanced
The 32LV3400 model uses the EAX64127201 / 11 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the FAN7930B PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the device LG 32LV3400:
Installed matrix (LED-panel) LC320EUN (SD) (V2).
The matrix control uses the Timing Controller (T-CON) 6870C-0368A.
The LED driver KLS-E320RABHF06D is used to power the backlight LEDs, it is controlled by the FAN7930B L6599AD PWM controller.
The necessary supply voltages for all nodes of the LG 32LV3400 TV are generated by the EAX64127201 power supply module or its analogs using 3BR4765JZ (Standby), FAN7930B (PFC), L6599AD microcircuits and 7NM60N power switches.
MainBoard - the main board (motherboard) is an EAX64272803 module, using chips LGE2111-T8, 24C08K, 25Q80BVSIG, NTP-7400L, AP7173 H5TQ1G63DFR, LCX244F204, AP2191D, AS324M-E1, MAX3232C and others.
The TDSS-G101D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUN-SDV2
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (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 07:59
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