Technical description and composition of the TOSHIBA 42WL58R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 42WL58R
Panel: LC420W02
Inverter (backlight): CXA-420W02-M 6632L-0107A, CXA-420W02-S 6632L-0106A
PWM Inverter: H201A, BA1032AF
MOSFET Inverter: FR3504Z
Power Supply (PSU): PD2171 23590258B, PD2173 23590260A
MainBoard: PD2235 B 23590314, PD2238
IC MainBoard: TA1318AFG
Tuner: ENG39A16GF
Specifications 42WL58R
TOSHIBA 42WL58R
General recommendations for repairing TV LCD
Diagnostics of malfunctions and repairs of the TOSHIBA 42WL58R, as well as other electronic devices, is recommended to begin with an external examination of the external and internal elements. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. 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.
Sometimes the TOSHIBA 42WL58R 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 PD2171 23590258B, PD2173 23590260A common power supply module. If it is working properly, you must check the standby batteries on the Main Board. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) 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 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.
In cases where the TOSHIBA 42WL58R TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight). 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. Turning off the 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.
Diagnostics and repair of the motherboard PD2235 B 23590314, PD2238 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. In some cases, it is necessary to check or replace (if necessary) the elements of the MainBoard - TA1318AFG. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
In cases where there is no tuning to the local television channels, you should make sure the software is correct, as well as the presence of supply voltages at the terminals of the ENG39A16GF tuner.
Attention to the owners! Attempts to self-repair the TOSHIBA 42WL58R TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32WL58, Toshiba 37WL58, Toshiba 42WL58
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 42WL58P PD2171A1 PD2172A1 PD2173A1 PD2238A1
Service Manuals with Schematic Diagrams 111 pages on models 32WL56R, 32WL56R, 37WL56R, 37WL56R, 27WL56R, 27WL56R, 32WL58R, 32WL58R, 37WL58R, 37WL58R, 42WL58R, 42WL58R, 32WLT58, 37WLT58, 42WLT58, 42WLT58
The appearance of the MainBoard PD2235 is shown in the figure below:PD2235
PD2235 can be used in TVs:
TOSHIBA 32WL58R (Panel LQ315T3LZ21), TOSHIBA 42WL58R (Panel LC420W02).
The appearance of the power supply
Key Features of the TOSHIBA 42WL58R:
Installed matrix (LCD panel) LC420W02.
To power the backlight, an inverter CXA-420W02-M is used, it is controlled by the PWM controller H201A, BA1032AF. As power elements of the inverter, keys of the type FR3504Z are used.
The necessary supply voltages for all nodes of the TOSHIBA 42WL58R TV are generated by the PD2171 power supply module or its analogs.
MainBoard - the main board (motherboard) is a PD2235 module, using TA1318AFG chips and others.
The ENG39A16GF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC420W02-SLB1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.25x523.01 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 71%
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: 20 pcs CCFL Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V