Technical description and composition of the SHARP LC-32D12E TV, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-32D12E
Panel: LTA320AP06
Inverter (backlight): SSI320-4UA01
PWM Inverter: OZ9966SN
MOSFET Inverter: STU432S, KMB054N40DB
Trans Inverter: LT-U3208
Power Supply (PSU): 17PW26-4 (vestel)
PWM Power: DL321, FAN7711
MOSFET Power: MDF9N50
MainBoard: 17MB61-2 (vestel)
IC MainBoard: 25Q80BVSIG, MAX9736A,
Tuner: DTOS403LH122E
Control: RC3902
Appearance
SHARP LC-32D12E
General recommendations for repairing TV LCD
Repair of the SHARP LC-32D12E TV is better to start with a thorough external inspection and troubleshooting. It is advisable to carefully examine the internal and external components. Often, for certain external signs, the repairman can draw some conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
In cases where the SHARP LC-32D12E TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the 17PW26-4 power supply module is most likely faulty (vestel) or, which is much less common, there is no power to the processor on the motherboard. In this case, first of all, it is necessary to check the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Variants of MDF9N50 are possible.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller DL321, FAN7711 or broken resistors in its bundle.
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
If the SHARP LC-32D12E does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
In most cases, the diagnosis and repair of the SSI320-4UA01 inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or breaks in high-voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Repair or diagnostics of the 17MB61-2 motherboard (vestel) must be started by checking the power stabilizers. If necessary, you should update 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 25Q80BVSIG, MAX9736A,.
In cases where there is no tuning to the local television channels, you should make sure that the voltage of the varicaps (30-33V) and other supply voltages at the terminals of the DTOS403LH122E tuner are present.
We recommend the owners of the LC-32D12E TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
diagram Vestel MB61 Sharp LC-32D12E, LC-40F22E
Main features of the SHARP LC-32D12E device:Installed matrix (LCD panel) LTA320AP06.
To power the backlight, an SSI320-4UA01 inverter is used, it is controlled by the OZ9966SN PWM controller. A transformer LT-U3208 is installed in the inverter converter. As power elements of the inverter, keys of the STU432S, KMB054N40DB type are used.
The necessary supply voltages for all nodes of the SHARP LC-32D12E TV are generated by the 17PW26-4 power module or its analogs using DL321, FAN7711 microcircuits and MDF9N50 type power switches.
MainBoard - the main board (motherboard) is a 17MB61-2 module, using 25Q80BVSIG, MAX9736A, and others.
The DTOS403LH122E tuner provides TV reception and channel tuning.
Information from an alternative source:
SHARP LC-32D12E
Panel Type (Matrix): LTA320AP06 (Samsung)
T-con: on the matrix bar. Inverter: SSI320-4UA01 PWM OZ9966SN
Motherboard: 17MB61-2 (vestel), flash - 25Q80BVSIG, Sound - MAX9736A, tune - DTOS403LH122E
PSU: 17PW26-4 (vestel), PWM DL321, FAN7711 MDF9N50 3pcs Remote: RC3902
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP06
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: APVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V