Technical description and composition of the ERISSON 22LDJ08 TV, type of panel and applicable modules. The composition of the modules.ERISSON
Model: 22LDJ08
Panel: LM220WE1
Inverter (backlight): LK-IN220417A
PWM Inverter: OB3302CP
MOSFET Inverter: AO4946
Trans Inverter: LKT-035MD 0937
Power Supply (PSU): LK1060-007B
MainBoard: RC719DU-F10
IC MainBoard: MSP3115G B8 V3, TDA9885ST, F40-100GCP, TDA1517P
Tuner: CDT-3FP212-30
Specifications 22LDJ08
ERISSON 22LDJ08
General recommendations for repairing TV LCD
Repairing an ERISSON 22LDJ08 TV is advisable to start with an external inspection of all its constituent elements, both internal electronic components and external. Inspection is also subject to body elements, control buttons, screen, connectors and cords. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a hint in the assumptions about the causes and consequences of the malfunction.
Sometimes the ERISSON 22LDJ08 TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the common power module LK1060-007B SH-04 94V-0 LK1072. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is torn, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the converter, which are often found in a breakdown state in such situations.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with a PWM controller in a single chip, are 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.
When using the Active Power Factor Correction (CMC) circuitry in the power module, the search for faulty elements is somewhat more complicated.
If ERISSON 22LDJ08 does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
Repair of the LK-IN220417A inverter can often be somewhat complicated by the use of special protection circuits that are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
When diagnosing with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
On the motherboard, in case of a malfunction, it is first of all necessary to check the operability of all power stabilizers of the microcircuits and, if necessary, update the software (software). In some cases, they require checking or replacing (if necessary) the elements of the MB board (SSB) - TDA1517P, MSP3115G B8 V3, CDT-3FP212-30.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LK-IN220417A
The appearance of the MainBoard RC719DU-F10 is shown in the figure below:RC719DU-F10
RC719DU-F10 can be used in TVs:
DIGITAL DL-16JT89 (Panel LTN156AT01), ERISSON 22LDJ08 (Panel LM220WE1 ), ERISSON 15LJ18 (Panel HT150X02-100).
Main features of the ERISSON 22LDJ08 device:
Installed matrix (LCD-panel) LM220WE1.
To power the backlight, an inverter LK-IN220417A is used, it is controlled by the PWM controller OB3302CP. A transformer LKT-035MD 0937 is installed in the inverter converter. Keys of the AO4946 type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the ERISSON 22LDJ08 TV is carried out by the power module LK1060-007B, or its analogues.
MainBoard - the main board (motherboard) is an RC719DU-F10 module, using microchips MSP3115G B8 V3, TDA9885ST, F40-100GCP, TDA1517P and others.
The tuner CDT-3FP212-30 provides the reception of television programs and tuning to channels.
Information from an alternative source:
ERISSON 22LDJ08 (2010)
Panel Type (Matrix): LTM220MT05
Motherboard: MST36-V1.2
T-con: LTM220MT05S2L V0.5 HF
Invertor: LK-IN220201A