Technical description and composition of the TOSHIBA 19SLDT3RW TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 19SLDT3RW
Chassis / Version: CMH143
Panel: M185XW01 V0
Inverter (backlight): PCB240 CEH434
PWM Inverter: BD9893F (16)
MOSFET Inverter: FW256-TL-E (8)
Trans Inverter: 8137001R
Power Supply (PSU): PCB240 CEH434,
PWM Power: FA5571N-D1 (8)
MOSFET Power: 2SK3532-01MR
MainBoard: CMH143 PCBF40
IC MainBoard: LA42052-E, DVD A52C01T650 DAV-RR933WR ZR36966PQCG, AM5888S L / F
Tuner: TDTG-S486D
Control: CEH439A
Specifications 19SLDT3
TOSHIBA 19SLDT3RW
General recommendations for repairing TV LCD
It is advisable to start repairing the TOSHIBA 19SLDT3RW TV with an external examination of all its constituent elements, both internal electronic components and external. Inspection is also subject to body elements, control buttons, screen, connectors and cords. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the PCB240 CEH434 power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch 2SK3532-01MR is detected, which can be integrated with a PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the FA5571N-D1 PWM controller chip (8), which can only be checked by replacing it with a new or obviously working one.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If there is no image when you turn on the TOSHIBA 19SLDT3RW, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the inverter power elements. Upon completion of the diagnosis, all regular protection circuits should be restored.
The PCBF40 motherboard CMH143, DVD A52C01T650 DAV-RR933WR ZR36966PQCG, AM5888S L / F is subject to check if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the power supply circuits of the microcircuits are working, a software update may be necessary. Board repair and replacement of LA42052-E microcircuits are carried out with the necessary equipment, and the corresponding element base.
If there is no reception of television channels, but the TV works properly from external devices, first of all it is necessary to check the voltage of the varicap tuner PCB290 CEH447, which is usually within 30-33V, as well as other supply voltages on the terminals of the tuner.
Owners and users of the TOSHIBA 19SLDT3RW TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 19SLDT3, 22SLDT3. DMH104A, CMH143A, CEH447A, CEH434A, CEH433B
1. Service Manual on the model 15SLDT3R, 19SLDT3R, 22SLDT3R, 26SLDT3R
2. Service Manuals with Schematic Diagrams 61 pages 2009 on model 19SLDT3, 22SLDT3
The appearance of the MainBoard CMH143 is shown in the figure below:CMH143
CMH143 can be used in TVs:
TOSHIBA 19SLDT3RW (Panel M185XW01 V0), TOSHIBA 22SLDT3R (Panel 22 inch), TOSHIBA 22SLDT3W (Panel M185XW01 V0), TOSHIBA 22SLDT3WR (Panel V216B1-L01).
Main features of the TOSHIBA 19SLDT3RW device:
Installed matrix (LCD panel) M185XW01 V0.
The PCB240 inverter is used to power the backlight, controlled by the BD9893F PWM controller (16). The transformer 8137001R is installed in the inverter converter. As the power elements of the inverter, keys of the FW256-TL-E type (8) are used.
The necessary supply voltages for all nodes of the TOSHIBA 19SLDT3RW TV are generated by the PCB240 power module or its analogs using FA5571N-D1 microcircuits (8) and power switches of the 2SK3532-01MR type.
MainBoard - the main board (motherboard) is a CMH143 module, using chips LA42052-E, DVD A52C01T650 DAV-RR933WR ZR36966PQCG, AM5888S L / F and others.
The TDTG-S486D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: M185XW01 V0
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 3.6 / 1.4 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V