Liuzhou Philips LCD TV after-sales repair phone PPTV "hijacked"

Liuzhou Philips LCD TV after-sales repair phone hijack Liuzhou Philips repair hotline: -
Liuzhou Philips electrical appliances after-sales repair: -
The high-definition color TVs produced by Philips in recent years have a high digital box failure rate and expensive repair costs. And easy to relapse. The experience of handling such failures is introduced below.
There are various symptoms of digital box damage, which can be roughly summarized into several types: the sound is normal but the image is messy, there are horizontal lines flashing randomly, there is only sound but no image, and there is sound after a few minutes of powering on, but color bars appear on the image. Then the screen is black, the line frequency is low, there is light in the upper half, and the screen is black in the lower half. After a while, the protection shuts down and the primary color brightness signal is lost. There are retrace thin lines on the image, like a film, or a negative image, the image is like colored stripes, sound, The screen display is normal, but the image sometimes has abnormal line and field amplitudes, displays horizontal stripes and shakes violently. It returns to normal after a few minutes, but still occasionally shakes. It is normal when the computer is first turned on. After a while, graphics enlargement, half graphics, stagnation, and line desynchronization occur. Wait, after booting up normally, there is sound and screen display but no image. After a few minutes, the image is restored and the image is unstable. It takes more than ten minutes after booting up to have an image. Lines are out of sync, and the field width is also shrinking, etc.
It has been proven through extensive theoretical analysis and practice that the root causes of the above failures are all caused by damage to the code box. This is a secondary integrated component, consisting of several large-scale integrated circuits (, 3, etc.) and some discrete components inside, and a metal shield on the outside. It is analyzed that the reason why this component is vulnerable is that it generates a large amount of heat, and frequent thermal expansion and cold contraction cause some pins to be soldered.
The ideal repair method is to replace the parts directly with new ones. The ex-factory price of this component is about RMB 1,000. If Philips repair station replaces it with this accessory, the total cost of materials, door-to-door fees, and maintenance fees will be about RMB 10,000. Moreover, the repair station only provides a 3-month warranty after repair, which is not accepted by most users. For self-repair, you can purchase accessories from some mail-order units. New parts are priced at RMB 1,000, and repaired parts are priced at RMB 1.00 per person. The new parts currently available on the market are digital boxes with improved heat dissipation from the manufacturer, and their working reliability has been significantly improved.
Although the above two maintenance methods are convenient, they are too expensive. In fact, most damaged digital boxes can be repaired. In this method, after removing the digital box, blow off the inside (located in the middle and with the most pins) with a hot air gun. After carefully cleaning up the debris on the circuit board, use a hot air gun to remove the integrated circuit. Just solder it on, it's best to stick a small heat sink on the back.