Skyworth LCD TV 37L16HC does not boot maintenance, a fault is that there is an indicator light does not boot first check the secondary power supply 5V is normal,
Press the standby button to boot, 24V, 12V, PFC are normally turned from the standby red light to the blue light in the on state, and the backlight is not lit.
Press the standby button again and it cannot be switched to standby.
Then the fault starts with the motherboard.
Observed the motherboard and found that U32 (4435M) was soldered, and 4 feet were broken.
This tube is a FET, and the 4 feet are G-class (control level).
This pipe has spare parts, and the test machine is replaced. The fault remains.
4435M FET
S power supply 12V (123 feet)
D output 12V (5678 feet)
G control terminal (4 feet)
G high level, no voltage output low level, output 12V
Input 12V voltage normal forcing (4435M) 4 pin short to ground (to low level)
The output 12V is normal, this part is normal.
Continue to observe the various power supply voltage markings on the motherboard.
After measurement, it was found that the voltage of 1.8V was 0V.
1.8V power supply is provided by U78 (ap1513).
Ap1513 is a DC-DC voltage converter,
Test ap1513 power supply 12 is normal,
No voltage output, resistance measurement around the original, no obvious damage found,
Online shopping this chip, in exchange for measuring the output 1.8V normal, the backlight appeared,
The button control is also normal, and the sound of the connected signal is normal.
The test machine is normal for N days.
Green Light Hydrogel Screen Protector
Eye protection:The principle of chlorophyll defocusing is adopted to prevent the eyeball from focusing for a long time, effectively alleviate eye fatigue, and achieve better eyesight protection.
Anti-blue light, ultraviolet light:The Green Light Film can actively filter the target wavelength while providing a band in the range of 380-400nm. It can effectively block 100% harmful light.
Edge coverage:The soft material fully covers the edges of any device, so it can be affixed to curved screen and round edges, 100% provides excellent edge coverage, and there is no gap between the edges of the device.
Oleophobic and waterproof:The oleophobic coating surface of the Green Light Screen Protector can provide your phone with oleophobic and waterproof properties, which can prevent sweat, grease residue, and fingerprints.
Sensitive touch:The 0.14mm ultra-thin film does not interfere with the touch response, almost as if it does not exist. When using a mobile phone, the fingertips can be easily swiped, bringing you a comfortable gaming experience.
Green Light Film,Green Light Screen Protector
Shenzhen Jianjiantong Technology Co., Ltd. , https://www.jjttpucuttingplotter.com