Technical description and composition of the TV SHARP LC-26SH7RU-BK, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-26SH7RU-BK
Panel: V260B2-L01
Inverter (backlight): T870I027.14
Trans Inverter: 4050L 102261 K65T4
Power Supply (PSU): 715G3467-3
PWM Power: L6599D, TNY277, FAN6961
MainBoard: 715G3535-3
IC MainBoard: MT5362ANG, TDA8933BTW, MT8292N, 24C32WP, MX25L4005, NAND128W3A2BN6
Tuner: FQD1116ME / BM-TPV 3139 147 26971
Control: LCD TV GJ210
Technical Specifications LC-26SH7
SHARP LC-26SH7RU-BK
General recommendations for repairing TV LCD
It is advisable to start the diagnostics of a malfunction of the SHARP LC-26SH7RU-BK TV, like all others, with an external examination of possible changes, both external and internal elements. 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. 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 LC-26SH7RU-BK does not turn on, does not respond to the remote control and the front panel buttons, does not blink light bulbs and does not show any signs of operability, most likely in this case the 715G3467-3 power module is faulty. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the possibility of an avalanche or thermal breakdown.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with a PWM controller in a single chip, are quite reliable and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
If there is no image when you turn on the SHARP LC-26SH7RU-BK, or it appears for a second and disappears completely, but there is sound, most likely either the backlight 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.
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.
Diagnosis and repair of the motherboard 715G3535-3 is carried out by checking the performance of power stabilizers or updating the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements TDA8933BTW, MT8292N, 5945 (8), 5947 (8).
If there is no reception of television channels, but the TV works correctly from external devices, first of all it is necessary to check the voltage of the varicaps of the tuner FQD1116ME / BM-TPV 3139 147 26971, which is usually in the range 30-33V, as well as other supply voltages at the terminals of the tuner .
Owners and users of the SHARP LC-26SH7RU-BK 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!
Service manual / schematic diagram --------------> Sharp LC-19SH7E, LC-19SH7RU LC-26SH7E, LC-26SH7RU, LC-32SH7E, LC-32SH7RU, LC-42SH7E, LC-42SH7RU
LC-19SH7E, LC-26SH7E, LC-32SH7E, LC-42SH7E, LC-19SH7RU, LC-26SH7RU, LC-32SH7RU, LC-42SH7RU
The appearance of the MainBoard 715G3535-3 is shown in the figure below:715G3535-3
The appearance of the power supply
Main features of the SHARP LC-26SH7RU-BK device:
Installed matrix (LCD panel) V260B2-L01.
To power the backlight used inverter T870I027.14. A transformer 4050L 102261 K65T4 is installed in the inverter converter.
The necessary supply voltages for all nodes of the SHARP LC-26SH7RU-BK TV are generated by the power supply module 715G3467-3, or its analogs using L6599D, TNY277, FAN6961 microcircuits.
MainBoard - the main board (motherboard) is a 715G3535-3 module, using MT5362ANG, TDA8933BTW, MT8292N, 24C32WP, MX25L4005, NAND128W3A2BN6, and others.
The tuner FQD1116ME / BM-TPV 3139 147 26971 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V260B2-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
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 Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V