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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Tuesday 8 September 2020

REPAIRING / SERVICING TV PANASONIC TX-LR39EM5A

Technical description and composition of the PANASONIC TX-LR39EM5A TV, panel type and modules used. The composition of the modules.
PANASONIC LED
Model: TX-LR39EM5A TX-L39EM5A
Chassis / Version: KM19E
Panel: T320HVN0.1,2 XXXXG
T-CON: T315HW07 VB (31T14-COJ) AUO-12306, AUO-61422, P301-16, ATH132 32DM
LED driver (backlight): 4H + V3416.001 / A2
PWM LED driver: DF3421
MOSFET LED driver: PA610AD
Power Supply (PSU): TNP4G531
PWM Power: CODBBYY00047 34A65
MOSFET Power: B1CERR000067
MainBoard: TNP4G535
IC MainBoard: CPU: MT5367PAHU; DRAM: H5Q2G63DFR; SPI Flash: 25Q128BVFG; EEPROM: 24C64; SOUND: D5452A; over: AN34043A, MT5135A
Tuner: ENVS9301D5F
TX-L39EM5A Specifications
PANASONIC TX-LR39EM5A
General recommendations for TV LCD LED repair
Possible malfunctions
- The PANASONIC TX-LR39EM5A 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.
In some cases, the TNP4G531 power supply module is faulty with similar manifestations. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (B1CERR000067) and rectifier diodes for possible partial or complete breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short-circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers CODBBYY00047 34A65, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
Usually, in such cases, a malfunction is detected in the LED panel backlight nodes. The reason may 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.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the TNP4G535 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). In some cases, repairing the MB (SSB) board may require replacement of chips - CPU: MT5367PAHU; DRAM: H5Q2G63DFR; SPI Flash: 25Q128BVFG; EEPROM: 24C64; SOUND: D5452A; over: AN34043A, MT5135A for new or known working ones. In cases where BGA technologies are used, defects are usually localized by heating.
If you suspect a malfunction of the ENVS9301D5F tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding terminals of the tuner.
Owners and users of the PANASONIC TX-LR39EM5A TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to the complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    PANASONIC TX-LR39EM5A Chassis KM19E


 MainBoard TNP4G535 is shown in the figure below:
TNP4G535
External view of the power supply
The main features of the PANASONIC TX-LR39EM5A device:
Installed matrix (LED-panel) T320HVN0.1,2 XXXXG.
The matrix control uses the T315HW07 Timing Controller (T-CON).
The LED driver 4H + V3416.001 is used to power the backlight LEDs, it is controlled by the PWM controller DF3421. The keys of the PA610AD type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-LR39EM5A TV is carried out by the TNP4G531 power module, or its analogs using CODBBYY00047 34A65 microcircuits and B1CERR000067 power switches.
MainBoard - the main board (motherboard) is a TNP4G535 module, using CPU chips: MT5367PAHU; DRAM: H5Q2G63DFR; SPI Flash: 25Q128BVFG; EEPROM: 24C64; SOUND: D5452A; over: AN34043A, MT5135A and others.
Tuner ENVS9301D5F provides reception of television programs and tuning to channels.
Posted By: FRANK at 05:41
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