Technical description and composition of the TOSHIBA 37CV500PR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 37CV500PR
Panel: LC370WXN-SAC1 75011157
Inverter (backlight): 6632-0506A PPW-EE37VT-0 (Y) Rev2.0 75013079
PWM Inverter: BD9897FS (32), A393 (8)
MOSFET Inverter: FDD8447L (3)
Trans Inverter: L2-EH37-A-08318B-K1
Power Supply (PSU): PE0531 V28A00071B1
PWM Power: A6169 (8), STRZ2589,
MOSFET Power: P10NK80, 10N60
MainBoard: PE0532 V28A000710A1
IC MainBoard: FLI32652H, CXB1444R, STA333W, 0747EFI T5CB5-6UK1 F1789ZAE
Tuner: ENG37E11GF
Appearance
TOSHIBA 37CV500PR
General recommendations for repairing TV LCD
Repair of the TOSHIBA 37CV500PR TV is best started with a thorough external inspection and diagnosis of the malfunction. It is advisable to carefully examine the internal and external components. 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. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Sometimes the TOSHIBA 37CV500PR 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 PE0531 V28A00071B1 power supply module. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the 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.
It should be borne in mind that in the repair practice it is extremely rare that key transistors of the N-FET type fail for no reason that should be looked for by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip A6169 (8), STRZ2589, which should be checked by replacement, are subject to verification.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the TOSHIBA 37CV500PR TV does not have an image, but there is sound, the malfunction should be sought in the backlight lamp power converter (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overstated ESR.
Repair of the inverter 6632-0506A PPW-EE37VT-0 (Y) Rev2.0 75013079 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 such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
On the PE0532 V28A000710A1 motherboard, in case of a malfunction, you should first check the operation of all power supply stabilizers in the circuits and, if necessary, update the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips FLI32652H, CXB1444R, STA333W, 0747EFI T5CB5-6UK1 F1789ZAE and other possible faulty components.
If the TV works normally from external devices, but does not tune into television channels, the ENG37E11GF tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
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 37CV500P MAIN PE0532. Service manual and schematic diagram
The appearance of MainBoard PE0532 is shown in the figure below:PE0532
PE0532 can be used in TVs:
TOSHIBA 32CV500PR (Panel LTA320AA03), TOSHIBA 37CV500PR (Panel LC370WXN-SAC1 75011157), TOSHIBA 42CV500PR (Panel LC420WXN-SAB1 75011173), TOSHIBA 42XV550PR (Panel LC420WUN (SA)(A1)), TOSHIBA 32XV550PR (Panel LTA320HA02), TOSHIBA 32XV500PR (Panel LTA320HA02), TOSHIBA 37XV501PR (Panel LC370WUN (SA)(B1)).
The appearance of the power supply
Main features of the TOSHIBA 37CV500PR device:
Installed matrix (LCD panel) LC370WXN-SAC1 75011157.
To power the backlight, an inverter 6632-0506A is used, it is controlled by the BD9897FS PWM controller (32), A393 (8). The transformer L2-EH37-A-08318B-K1 is installed in the inverter converter. As power elements of the inverter, keys of the FDD8447L type (3) are used.
The necessary supply voltages for all nodes of the TOSHIBA 37CV500PR TV are generated by the PE0531 power module or its analogs using A6169 (8), STRZ2589 microcircuits, and power switches of the type P10NK80, 10N60.
MainBoard - the main board (motherboard) is a PE0532 module, using chips FLI32652H, CXB1444R, STA333W, 0747EFI T5CB5-6UK1 F1789ZAE and others.
The ENG37E11GF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC370WXN-SAC1
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.6x460.8 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1100: 1
Display Colors: 16.7M (8-bit)
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V