Technical description and composition of the TOSHIBA 22AV733R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 22AV733R 22AV734R
Panel: V216B1-L02 RevC1
Inverter (backlight): 715G3721-P02-H20-001U
PWM Inverter: OZ9938GN (16)
MOSFET Inverter: AO4616 (8)
Trans Inverter: 80GL24T-23-H
Power Supply (PSU): 715G3721-P02-H20-001U
PWM Power: LD7575 (PWM flyback)
MOSFET Power: K4101
MainBoard: 715G3748 - M01-000-005B 75019866 // 75020931 CBPFA4ABZVS
IC MainBoard: BD5445EFV (28) untr 75024923. G5627 (8) DC-DC, DRV602 (14), 24C32
Tuner: ENV57S01D8RF
Control: CT-90326 75014827
Specifications 22AV733
TOSHIBA 22AV733R
General recommendations for repairing TV LCD
Repair of the TOSHIBA 22AV733R, 22AV734R TV is better to start with a thorough external inspection and diagnosis of the malfunction. It is advisable to carefully examine the internal and external components. 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.
If the power supply module 715G3721-P02-H20-001U malfunctions, the external manifestations may be different, for example, the TOSHIBA 22AV733R, 22AV734R does not turn on at all and there is no indication of the indicator lights on the front panel. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the K4101 converter, which are often found in a breakdown state in such situations.
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 reason may be a malfunction of the LD7575A PS 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.
In cases where the TOSHIBA 22AV733R, 22AV734R TV has lost an image, and the sound is there and all other functions are functional, 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.
Repair of the 715G3721-P02-H20-001U inverter can often be somewhat complicated by the use of special protection circuits, which 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.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Repair of the motherboard 715G3748-M01-000-005B 75019866 // 75020931 CBPFA4ABZVS must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. If it is not possible to replace the MB board (SSB), you need to check the health of its elements - BD5445EFV (28) unch 75024923. G5627 (8) DC-DC, DRV602 (14), 24C32. Defective components should be replaced.
In cases where there is no tuning to the local television channels, you should make sure that there is varicap supply voltage (30-33V) and other supply voltages at the terminals of the tuner ENV57S01D8RF.
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 ------------------> Toshiba 22AV733R 22AV734R
Service Manuals with Schematic Diagrams 52 pages on model 22AV733G, 22AV734G.
The appearance of the MainBoard 715G3748 is shown in the figure below:715G3748
715G3748 can be used in TVs:
TOSHIBA 19AV733 (Panel M185B1-L03), TOSHIBA 22AV733R 22AV734R (Panel V216B1-L02 RevC1).
Main features of the TOSHIBA 22AV733R device:
Installed matrix (LCD panel) V216B1-L02 RevC1.
To power the backlight, an inverter 715G3721-P02-H20-001U is used, it is controlled by the PWM controller OZ9938GN (16). The transformer 80GL24T-23-H is installed in the inverter converter. As power elements of the inverter, keys of the AO4616 type (8) are used.
The necessary supply voltages for all nodes of the TOSHIBA 22AV733R TV are generated by the 715G3721-P02-H20-001U power module, or its analogs using LD7575 microcircuits (PWM flyback) and K4101 type power switches.
MainBoard - the main board (motherboard) is a 715G3748 module, using BD5445EFV (28) unch 75024923 chips. G5627 (8) DC-DC, DRV602 (14), 24C32 and others.
The ENV57S01D8RF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V216B1-L02
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN
Active Area: 477.417x268.416 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 800
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V