Technical description and composition of the TV SONY KLV-26HG2, type of panel and applicable modules. The composition of the modules.SONY
Model: KLV-26HG2
Chassis / Version: AT2
Panel: LTA260W1-L05 1280x768 WXGA
Lamp backlight: 12 Lamp CCFL
T-CON: 260WC4LV1.1S
Inverter (backlight): KLS-260SS REV: 02 SIT260WD16B05
Power Supply (PSU): 1-861-869-11 (1-724-086-11) A1302898A 2015847
PWM Power: MCZ3001U, STR-A6459
MOSFET Power: 2SK3555
MainBoard: 1-688-790-21
IC MainBoard: PW166B-10T, CXD2097BQ
Tuner: BTF-WA421 1-861-862-12
Technical Specifications KLV-26HG2
SONY KLV-26HG2
General recommendations for repairing TV LCD
Possible manifestations of defects
- The SONY KLV-26HG2 TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
In some of these cases, a malfunction is detected in the power module 1-861-869-11. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
If in diagnosing a malfunction, it is necessary to disable 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 finished, it is necessary to restore the protection circuits for 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 the operating mode, it does not respond to the remote control.
Repair or diagnostics of the 1-688-790-21 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - PW166B-10T, CXD2097BQ. Defective components should be replaced.
If the TV works normally from external devices, but does not tune into television channels, the tuner 1-861-862-12 may malfunction. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Service manual / schematic diagram ---------------> SONY KLV-26HG2 Chassis AT2
KLV-26HG2.
The appearance of MainBoard 1-688-790-21 is shown in the figure below:1-688-790-21
Main features of the device SONY KLV-26HG2:
Installed matrix (LCD panel) LTA260W1-L05 1280x768 WXGA.
The matrix control uses the Timing Controller (T-CON) 260WC4LV1.1S.
To power the backlight used inverter KLS-260SS.
The necessary supply voltages for all nodes of the SONY KLV-26HG2 TV are generated by the power module 1-861-869-11, or its analogs using microchips MCZ3001U, STR-A6459 and power switches of the type 2SK3555.
MainBoard - the main board (motherboard) is a 1-688-790-21 module, using PW166B-10T, CXD2097BQ chips and others.
The BTF-WA421 1-861-862-12 tuner allows you to receive television programs and tune to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA260W1-L05
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1280x768, WXGA
Display Mode: Normally Black, Transmissive
Active Area: 566.4x339.84 mm
Display Colors: 16.7M (8-bit)
Frequency: 60Hz
Lamp Type: CCFL
Brand: SONY, Model: KLV-26HG2.
Short from TV: LCD, 26 ", 1280x768, sound: 8 watts.
The composition uses MainBoard 1-688-790-21 and LCD-panel LTA260W1-L05 1280x768 WXGA.
Power Supply Unit (PSU) 1-861-869-11 (1-724-086-11) A1302898A 2015847 Power Supply.