Technical description and composition of the SAMSUNG LE22A656A1D TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE22A656A1D LE22A656
Panel: LTM220M1-L01
T-CON: LTM220M1S2LV1.2; LRU4312X3A-AN, 17514HS X3
Inverter (backlight): integrated into PSU
PWM Inverter: SEM2005
MOSFET Inverter: 4506GEH
Power Supply (PSU): BN44-00232A
PWM Power: FAN7602
MOSFET Power: FQPF7N65C
MainBoard: BN41-01027C BN94-01817F
IC MainBoard: CPU: SEMS01; DRAM: K4D261638K-LC40; NAND Flash: HYB25DC256163CE-4; SPI Flash: 25L1605; EEPROM: 24C256; SOUND: NTP3100;
Tuner: BN40-00120A
Control: BN59-00705A
Technical Specifications LE22A656A1D
SAMSUNG LE22A656A1D
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE22A656A1D TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
Often in such cases, the BN44-00232A power supply is faulty. It is then necessary to measure its output voltages and, in the event of their complete absence, check the power switches (FQPF7N65C) and the rectifier diodes of the converter for a short circuit probability.
In case of breakdowns of semiconductor elements in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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 elements supplying the PWM controller, frequency-setting and damping circuits, or elements of OOS (negative feedback) stabilization.
The reason for the breakdown of the power switch may also be the PWM controller FAN7602. It is checked only by replacement with a known good one.
- There is no image, there is sound, it reacts to the remote control, channels are switched. In some cases, the image appears when you turn on and immediately disappears.
A defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, the breakdown keys and the transformer secondary windings must be ringed in its converter.
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 operations, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the BN41-01027C motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update or replace the software (software). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CPU: SEMS01; DRAM: K4D261638K-LC40; NAND Flash: HYB25DC256163CE-4; SPI Flash: 25L1605; EEPROM: 24C256; SOUND: NTP3100; on new or obviously serviceable. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before changing the tuner BN40-00120A, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention TV owners! Attempts to self-repair SAMSUNG LE22A656A1D are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of the MainBoard BN41-01027C is shown in the figure below:BN41-01027C
BN41-01027C can be used in TVs:
SAMSUNG LE19A656A1D (Panel M190A1-L07), SAMSUNG LE22A656A1D LE22A656 (Panel LTM220M1-L01).
Main features of the SAMSUNG LE22A656A1D device:
Installed matrix (LCD panel) LTM220M1-L01.
The matrix management uses the Timing Controller (T-CON) LTM220M1S2LV1.2 ;.
To power the backlight, a converter is used, combined with a power supply, controlled by the SEM2005 PWM controller. As power elements of the inverter, keys of the 4506GEH type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE22A656A1D TV are generated by the BN44-00232A power module or its analogs using FAN7602 microcircuits and power switches of the FQPF7N65C type.
MainBoard - the main board (motherboard) is a BN41-01027C module, using CPU chips: SEMS01; DRAM: K4D261638K-LC40; NAND Flash: HYB25DC256163CE-4; SPI Flash: 25L1605; EEPROM: 24C256; SOUND: NTP3100; and others.
The tuner BN40-00120A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM220M1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 22.0 inch
Resolution: 1680x1050, WSXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 473.76x296.1 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 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 Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V