Samsung LCD TV suddenly black screen, but the sound is normal, how is this going? How to quickly repair? Today, Xiao Bian will take you to understand the causes of the black screen phenomenon on the Samsung LCD TV, how to repair it, and whether to pay for maintenance costs.
Samsung LCD TV black screen causes
1, the motherboard problem
2. Backlight Problems How Samsung LCD TV Repairs
Repair step one:
First of all, to determine whether the problem is the motherboard or backlight problems, you can see the lights have no response, if even the lights are not lit, you must check the motherboard power section
1, with a multimeter to measure the main power supply operating point, the fuse is blown, if the fuse must disconnect the power supply, measure the main power supply operating point with a resistance file whether there is a short circuit, short circuit we must carefully find the line, whether the circuit board copper foil short circuit And whether the related components are damaged or not.
2. If there is no short-circuit phenomenon, you can refer to the white screen phenomenon to ensure that the voltage and signal input and output of each working point are in normal working condition.
Samsung LCD TV black screen
Repair step two: If the working status of the motherboard is normal, it is necessary to check the backlight
1, check the main board to the backlight connection with the main contact
2, using a multimeter to measure the backlight voltage, there must be 12V supply voltage, there must be 3.3V-5V switching voltage and 0-5V backlight adjustment voltage, backlight switching voltage is the most important, if there is no voltage or voltage is too low, To check if the output level of the MCU and the transistor's operating state are normal, pay attention to whether or not there is a short circuit, and replace the components when necessary.
According to professional appliance repair masters, the most common cause of black screen faults in Samsung LCD TVs is the problem of high-voltage boards. Under normal circumstances, a diode (DP803) next to the transformer is broken down and replaced with a different type of diode, the large capacitor CP811. There is a voltage close to 400V. At this time, the fault still exists. Replace the universal high-voltage power supply integrated board on the line.
Samsung LCD TV repair service products: Samsung LCD TV (including LED TV)
Warranty period: 1 year for the whole machine, 3 years for major components
Main components: Display, backlight components, logic components, high-frequency tuner
Customer Service Phone
Customer Service Hours: 8:00-21:00 Monday to Friday, 8:00-17:00 Saturday-Sunday
Under what circumstances, Samsung LCD TV does not implement three packs of services
Is one of the following circumstances, does not implement the three packs, only provides fee maintenance:
More than three bags of validity;
1. Consumers who install themselves do not install, use, maintain or keep the product in accordance with the instructions for use of the product.
2. The repairer who does not assume the three guarantees removes the damage;
3, no valid three packs of vouchers and valid invoices;
4, unauthorized changes in the three packs of vouchers;
5. The type or number of the product on the three-package voucher is not in conformity with the physical product;
6, due to force majeure caused damage.
Samsung LCD TV black screen problem is one of the most common types of faults for Samsung LCD TVs. As long as you are on “Baidu LCD TV black screen†on Baidu, you will find many similar situations with your TV, and many of them have not been repaired. Additional repairs are also paid. Therefore, I suggest that before repairing the black screen problem of Samsung LCD TV, we must first understand the service content of the next Samsung LCD TV to avoid being repaired by some local repair shops.
Samsung LCD TV black screen causes
1, the motherboard problem
2. Backlight Problems How Samsung LCD TV Repairs
Repair step one:
First of all, to determine whether the problem is the motherboard or backlight problems, you can see the lights have no response, if even the lights are not lit, you must check the motherboard power section
1, with a multimeter to measure the main power supply operating point, the fuse is blown, if the fuse must disconnect the power supply, measure the main power supply operating point with a resistance file whether there is a short circuit, short circuit we must carefully find the line, whether the circuit board copper foil short circuit And whether the related components are damaged or not.
2. If there is no short-circuit phenomenon, you can refer to the white screen phenomenon to ensure that the voltage and signal input and output of each working point are in normal working condition.
Samsung LCD TV black screen
Repair step two: If the working status of the motherboard is normal, it is necessary to check the backlight
1, check the main board to the backlight connection with the main contact
2, using a multimeter to measure the backlight voltage, there must be 12V supply voltage, there must be 3.3V-5V switching voltage and 0-5V backlight adjustment voltage, backlight switching voltage is the most important, if there is no voltage or voltage is too low, To check if the output level of the MCU and the transistor's operating state are normal, pay attention to whether or not there is a short circuit, and replace the components when necessary.
According to professional appliance repair masters, the most common cause of black screen faults in Samsung LCD TVs is the problem of high-voltage boards. Under normal circumstances, a diode (DP803) next to the transformer is broken down and replaced with a different type of diode, the large capacitor CP811. There is a voltage close to 400V. At this time, the fault still exists. Replace the universal high-voltage power supply integrated board on the line.
Samsung LCD TV repair service products: Samsung LCD TV (including LED TV)
Warranty period: 1 year for the whole machine, 3 years for major components
Main components: Display, backlight components, logic components, high-frequency tuner
Customer Service Phone
Customer Service Hours: 8:00-21:00 Monday to Friday, 8:00-17:00 Saturday-Sunday
Under what circumstances, Samsung LCD TV does not implement three packs of services
Is one of the following circumstances, does not implement the three packs, only provides fee maintenance:
More than three bags of validity;
1. Consumers who install themselves do not install, use, maintain or keep the product in accordance with the instructions for use of the product.
2. The repairer who does not assume the three guarantees removes the damage;
3, no valid three packs of vouchers and valid invoices;
4, unauthorized changes in the three packs of vouchers;
5. The type or number of the product on the three-package voucher is not in conformity with the physical product;
6, due to force majeure caused damage.
Samsung LCD TV black screen problem is one of the most common types of faults for Samsung LCD TVs. As long as you are on “Baidu LCD TV black screen†on Baidu, you will find many similar situations with your TV, and many of them have not been repaired. Additional repairs are also paid. Therefore, I suggest that before repairing the black screen problem of Samsung LCD TV, we must first understand the service content of the next Samsung LCD TV to avoid being repaired by some local repair shops.