Technical description and composition of the SONY KDL-19L4000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-19L4000
Chassis / Version: NEX
Panel: M190DZ1-L01 1-802-705-11
Inverter (backlight): integrated into PSU
PWM Inverter: OZ964GN (20)
MOSFET Inverter: 4511GH
Trans Inverter: TMS93704CT
Power Supply (PSU): DPS-70EP 1-857-172-11 MOUNTED PWB G (POWER)
PWM Power: DAP011 (14), PAJ814G, PANO 3063 (8).
MainBoard: 1-857-143-31 B board 185714371
IC MainBoard: PNX8541E1 / 2009, E5116AJBG, M25P10
Tuner: ENG37E10KF
Technical Specifications KDL-19L4000
SONY KDL-19L4000
General recommendations for repairing TV LCD
It is reasonable to start the repair of the SONY KDL-19L4000 TV with a careful external examination before proceeding to the diagnosis of the malfunction. It is advisable to carefully internal and external components. It often happens that some damage to elements or connections will help determine the correct direction of troubleshooting and localization of the defect. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the power supply module DPS-70EP 1-857-172-11 MOUNTED PWB G (POWER) fails, the external manifestations may be different, for example, the SONY KDL-19L4000 does not turn on at all and there is no indication of the indicator lights on the front panel. When diagnosing and repairing the DPS-70EP 1-857-172-11 MOUNTED PWB G (POWER) power supply, the fuse must first be checked, and if it is broken, the power switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
As a rule, the keys of flyback converters, which are used as an N-Fet field effect transistor on a separate heatsink, or integrated with a DAP011 (14), PAJ814G, PANO 3063 (8) PWM controller. into a single chip, reliable enough and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
In cases where the SONY KDL-19L4000 TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Repairing the DPS-70EP 1-857-172-11 MOUNTED PWB G (POWER) inverter is difficult because in case of any malfunction or abnormal situation, even if the lamps are unevenly worn, a protection is triggered that turns it off for fire safety purposes. Diagnostics become impossible and protection needs to be disabled.
When disabling protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Repair or diagnostics of the 1-857-143-31 MOUNTED PWB B (MAIN) motherboard must be started by checking the power conditioners. If necessary, you should update the software (software).
Once again, remind users! Attempts to self-repair a SONY KDL-19L4000 TV without the appropriate qualifications and experience can lead to its complete unrepairability!
Service manual / schematic diagram -------------> Sony KDL-19L4000, KDL-26L4000 CHASSIS NEX.
PSU / schematic diagram -------------> DPS-70EP Power supply Sony
The appearance of MainBoard 1-857-143-31 is shown in the figure below:1-857-143-31
The appearance of the power supply
Main features of the device SONY KDL-19L4000:
Installed matrix (LCD panel) M190DZ1-L01 1-802-705-11.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ964GN PWM controller (20). A transformer TMS93704CT is installed in the inverter converter. As power elements of the inverter, keys of the type 4511GH are used.
The necessary supply voltages for all nodes of the SONY KDL-19L4000 TV are generated by the DPS-70EP power module or its analogs using DAP011 (14), PAJ814G, PANO 3063 (8) microcircuits ..
MainBoard - the main board (motherboard) is a module 1-857-143-31, using chips PNX8541E1 / 2009, E5116AJBG, M25P10 and others.
The ENG37E10KF tuner provides TV reception and channel tuning.
