A 32-inch LCD TV, when the screen is turned on, the screen is black and the sound is normal.
Booting straight to the high voltage board, the oscilloscope measures the output pin of the primary side of the high voltage transformer, and the waveforms of the six transformer measuring points are the same.
Change the secondary side current detection terminal pin, among the 12 pins of the transformer, 11 waveforms are as follows, the positive and negative pulse amplitudes are the same.
Only one of the pin pulse waveforms is abnormal, and the positive pulse amplitude is half the amplitude of the negative pulse.
Experience tells me that this is not a lamp problem. If it is a lamp problem, the amplitude of the positive and negative pulses should be the same, but the size has changed.
If the lamp is excluded, remove the transformer directly.
Quickly scouring a back to install, boot is no longer protected.
A business tablet must have powerful business functions. At present, users use tablet products more for entertainment, and insufficient development of commercial value has become a major factor restricting the development of tablet computers. Many far-sighted terminal manufacturers have set their sights on the business tablet field.
Generally speaking, when business users choose tablet PC products, they still focus on "regular items" such as processor, battery, operating system, and built-in applications, especially office software applications, which are a good helper for business users.
First of all, there must be powerful office software such as customer management software, which can record customer data and related information anytime, anywhere. There is also a need for powerful marketing software, software marketing, reducing manual intervention, and one person can handle all the publicity and customer information.
Business Tablet,4k,5G
Jingjiang Gisen Technology Co.,Ltd , https://www.gisentech.com