Technical description and composition of the SHARP LC-20B6E TV, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-20B6E
Panel: LQ201X3FZ10
Inverter (backlight): RUNTKA087WJZZ C1U11-3005 49-9-0103-002
PWM Inverter: QZ9RRICN
Power Supply (PSU): Adapter 12V
MOSFET Power: K2782
Mainboard: XC539WJ
IC MainBoard: IXA665WJ, AD9883A1
Tuner: NQA016WJ
Control: GA295WJSA
Technical Specifications LC-20B6E
SHARP LC-20B6E
General recommendations for repairing TV LCD
Like any other TV, it is advisable to start repairing SHARP LC-20B6E with an external inspection of the visible changes in the external and internal elements. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. 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.
If the SHARP LC-20B6E does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a power module malfunction. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the K2782 converter, which are often found in breakdown conditions in such situations.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason, and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked.
Diagnosis and repair of the inverter is often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Once again, remind users! Attempts at self-repair of the SHARP LC-20B6E TV without the appropriate qualifications and experience can lead to its complete non-repairability!
schematic / manual -------------------> Sharp LC-20B6EE, LC-20B6EF, LC-20B6EI, LC-20B6ERU, LC-20B6EK
Main features of the SHARP LC-20B6E device:Installed matrix (LCD panel) LQ201X3FZ10.
To power the backlight, an inverter RUNTKA087WJZZ is used, it is controlled by the PWM controller QZ9RRICN.
To power all the internal components of the SHARP LC-20B6E TV, an external adapter 12V type is used with K2782 type power switches.
MainBoard - the main board (motherboard) is an XC539WJ module using IXA665WJ, AD9883A1, and others.
The NQA016WJ tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SHARP
Model: LQ201X3FZ10
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 1024x768, XGA
Display Mode: ASV, Normally Black, Transmissive
Active Area: 408.6x306.4 mm
Surface: Antiglare (Haze 23%), Hard coating (2H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 16/5 (Tr / Td)
Frequency: 60Hz