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, 19 February 2020

REPAIR / SERVICING TV LG 32LK551

Technical description and composition of the LG 32LK551 TV, panel type and applicable modules. The composition of the modules.
LG
Model: 32LK551 ZB
Chassis / Version: LD01U
Panel: LC320WUD (SC) (A2)
Lamp backlight: EEFL
T-CON: 6870C-0312B 32/37/47 FHD 120HZ
Inverter (backlight): 6632L-0636A - 3PEGA20003A-R PNEC-D031
Power Supply (PSU): EAX63985401 / 6 LGP32-11P
PWM Power: L6599AD (PWM Resonant), 3BR4765JZ (Standby)
MOSFET Power: MDF6N60
MainBoard: EAX64290501 (0) L * 01U
IC MainBoard: CPU: LGE107DC-RP, DDR: H5TQ1G63DFR-PBC, Nand: K9F1G08U0D, FLASH 25Q80, EEPROM 24C16; SOUND: NTP7100
Tuner: TDTJ-S001D
Control: AKB72915244
Specifications 32LK551
LG 32LK551
General recommendations for repairing TV LCD
Repair of the LG 32LK551 TV should begin with a careful external examination of all its constituent elements and modules. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Swollen electrolytic or cermet capacitors, carbonized resistors, ring cracks in the soldering of the outputs of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
In case of a power supply module malfunction, external manifestations may be different, for example, LG 32LK551 does not turn on at all and there is no indication of control lights on the front panel. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the LG 32LK551 does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter 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 inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors. If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
Diagnosis and repair of the EAX64290501 (0) L * 01U 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. Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: LGE107DC-RP, DDR: H5TQ1G63DFR-PBC, Nand: K9F1G08U0D, FLASH 25Q80, EEPROM 24C16; SOUND: The NTP7100 requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before replacing the TDTJ-S001D tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals.
It is necessary to remember to users that attempts to self-repair the LG 32LK551 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
LG Chassis LD01U, 32LK550, 32LK550A, 32LK550N, 32LK551, 32LK550-ZA, 32LK550A-ZA, 32LK550N-ZA, 32LK551-ZB SERVICE MANUAL.
FIRMWARE  EEPROM  --------------------------------> 24C08W1 LG 32LK551


 The appearance of the MainBoard EAX64290501 is shown in the figure below:
EAX64290501
EAX64290501 can be used in TVs:
LG 32LV2500-ZA (Panel T315XW06 V.3), LG 37LV3500-ZA (Panel T370HW05 V.1), LG 42LV3400-ZA (Panel T420HW08 V.1), LG 32LK530 (Panel LC320WUD (SC)(A3)), LG 37LK430 (Panel LC370WUE), LG 32LK451 ZA (Panel T315HW04 V.9), LG 42LV3551 (Panel LC420EUN (SD) (V3)), LG 47LW4500 (Panel LC470EUF (SD)(F2)), LG 32LK551 ZB (Panel LC320WUD (SC)(A2)), LG 42LV3500 (Panel LC420EUN (SD)(V3)), LG 42LK551 ZB (Panel V420H2-LH5), LG 42LK451 42LK451-ZG.BRUYLJU (Panel T420HW09 V0), LG 42LK530 (Panel LC420WUF (SC)(A2)), LG 47LK950 ZA (Panel LC470WUF (SD)(P1)), LG 32LW4500 ZB (Panel LC320EUD (SD)(P1)), LG 42LW4500 ZB (Panel LC420EUF (SD)(PX)), LG 42LV4500 DA (Panel LC420EUF (SD)(A1)), LG 32LV4500 (Panel LC320EUD (SD)(A4)), LG 42LV369C (Panel T420HW08 V.9).
The appearance of the power supply
Main features of the device LG 32LK551:
Installed matrix (LCD panel) LC320WUD (SC) (A2).
The matrix control uses the Timing Controller (T-CON) 6870C-0312B.
An inverter 6632L-0636A is used to power the backlight.
The necessary supply voltages for all nodes of the LG 32LK551 TV are generated by the EAX63985401 power supply module or its analogs using L6599AD (PWM Resonant), 3BR4765JZ (Standby) microcircuits and MDF6N60 power switches.
MainBoard - the main board (motherboard) is an EAX64290501 module using CPU chips: LGE107DC-RP, DDR: H5TQ1G63DFR-PBC, Nand: K9F1G08U0D, FLASH 25Q80, EEPROM 24C16; SOUND: NTP7100 and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320WUD-SCA2
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: 380 cd / m²
Contrast Ratio: 1050: 1
Display Colors: 16.7M / 1.07B (8-bit / 8-bit + Hi-FRC), CIE1931 72%
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz + 120Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (4 ch, 8/10-bit), 92 pins
Voltage: 12.0V

Posted By: FRANK at 07:34
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