Technical description and composition of the LG RZ-15LA66K TV, panel type and applicable modules. The composition of the modules.LG
Model: RZ-15LA66K
Chassis / Version: ML-041B
Panel: 15 inch
Inverter (backlight): TCI-AJS D
PWM Inverter: BIT3105P
MOSFET Inverter: 203D6
Power Supply (PSU): TCI-AJS D
PWM Power: FDS8958
MOSFET Power: SSM07N70
MainBoard: ML-041B
IC MainBoard: VCT49XYF C7 - MPU gm2221-LF MPS7720 LA7222, AT49F002AN
Tuner: 6700VS0003E
Control: 6710T00008T
Appearance
LG RZ-15LA66K
General recommendations for repairing TV LCD
Diagnostics of malfunctions and repair of LG with the ML-041B chassis, as well as other electronic devices, is recommended to begin with an external examination of the external and internal elements. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
In cases where the LG RZ-15LA66K TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the TCI-AJS power module is most likely to be faulty D or there is no processor power on the motherboard (a typical defect of some LG TVs). It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors SSM07N70, which are often found in such a state of breakdown.
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 FDS8958 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 circuit.
If the LG RZ-15LA66K has no image, but there is sound and the TV is controlled from 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. 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.
On the ML-041B 6700VS0003E motherboard, in case of a malfunction, you should first check the performance of all the stabilizers or power converters of the microcircuits and, if necessary, update the software (software). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - VCT49XYF C7 - MPU gm2221-LF MPS7720 LA7222, AT49F002AN, TUNER 6700VS0003E. Defective components should be replaced.
Attention to the owners! Attempts at self-repair of the LG RZ-15LA66K TV are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual / schematic diagram -------------> LG RZ-15LA66 Chassis ML-041B
Main features of the device LG RZ-15LA66K:Installed matrix (LCD-panel) 15 inches.
To power the backlight, a TCI-AJS inverter is used, it is controlled by the BIT3105P PWM controller. As power elements of the inverter, keys of type 203D6 are used.
The necessary supply voltages for all nodes of the LG RZ-15LA66K TV are generated by the TCI-AJS power module or its analogs using FDS8958 microcircuits and power switches of the SSM07N70 type.
MainBoard - the main board (motherboard) is an ML-041B module, using VCT49XYF C7 chips - MPU gm2221-LF MPS7720 LA7222, AT49F002AN and others.
The tuner 6700VS0003E provides TV reception and channel tuning.
