Technical description and composition of the THOMSON 27LM051B6 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 27LM051B6
Chassis / Version: 715T1616-1
Panel: V270B1-L01
T-CON: V270B1-L01-C
Inverter (backlight): I270B1-12A
PWM Inverter: OZ964GN
Trans Inverter: 4009L
Power Supply (PSU): 715T1180-3
PWM Power: TDA4863-2G, L6565D, TOP246YN
MOSFET Power: IRFP460A, STP10N70
MainBoard: 715T1616-1, 715T2170-1
IC MainBoard: CPU: M30620SPGP, SPI Flash: EN29F040A-70JCP, Scaler: SVPTMEX52-LF
Tuner: FQ1216ME / IH-5
Appearance
THOMSON 27LM051B6
General recommendations for TV LCD repair
Possible malfunctions
- TV THOMSON 27LM051B6 does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
In some of these cases, the fault is detected in the 715T1180-3 power module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (IRFP460A, STP10N70) and rectifier diodes for possible partial or complete breakdown.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and less often the current sensor in the source of the key.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying a PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) TDA4863-2G, L6565D, TOP246YN, in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
A defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open circuit.
If, when diagnosing a malfunction, it is required to turn off the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are completed, it is imperative to restore the protection circuits for the further safe operation of the TV by the owner in normal mode.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the 715T1616-1 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - CPU: M30620SPGP, SPI Flash: EN29F040A-70JCP, Scaler: SVPTMEX52-LF. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
Before changing the FQ1216ME / IH-5 tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Remember! Attempts to self-repair the THOMSON 27LM051B6 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> THOMSON 27LM051B6 Chassis 715T1616-1
The appearance of MainBoard 715T1616-1 is shown in the figure below:715T1616-1,
External view of the power supply
The main features of the THOMSON 27LM051B6 device:
Installed matrix (LCD panel) V270B1-L01.
Matrix control uses Timing Controller (T-CON) V270B1-L01-C.
To power the backlight lamps, an I270B1-12A inverter is used, controlled by an OZ964GN PWM controller. A 4009L transformer is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the THOMSON 27LM051B6 TV is carried out by the 715T1180-3 power module, or its analogs using TDA4863-2G, L6565D, TOP246YN microcircuits and power switches such as IRFP460A, STP10N70.
MainBoard - the main board (motherboard) is a 715T1616-1 module, using CPU chips: M30620SPGP, SPI Flash: EN29F040A-70JCP, Scaler: SVPTMEX52-LF and others.
The FQ1216ME / IH-5 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V270B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 27.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 596.259x335.232 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 550 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V