Thomson TP4312D projection TV does not boot failure repair example - appliance repair - Database & Sql Blog Articles

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In July 2010, I received a repair from a Thomson customer. In response to the fact that the Thomson TP4312D projection TV purchased was not turned on, there are usually several phenomena:
1) There is power display, that is, the power indicator is on and not on;
2) No power display, that is, the power indicator is off and does not turn on;
After I asked the customer, the feedback received by the customer was no power display and no power on.
According to the general maintenance experience, there should be problems in several areas, power supply and system control are possible.
After going to the door, I measured the power supply +5V normal, the CPU power supply is normal, the static resistance of the power failure measurement found that the CPU and RAM address line resistance is low, the replacement RAM is still the same, because the CPU is more than one hundred feet of SMT, easy to not solder, However, after removing the peripheral devices, there is no way, only replacement, after soldering the CPU with the tool, replace the new CPU, solder, clean, dry and turn on the power, the power supply indication is normal, the boot screen, the image, the sound is normal.
Special reminder, the CPU of the machine is surface soldering, and the copper foil under the link is very thin, the welding must master the time, otherwise it is easy to burn the copper foil scrap signal board. Also, do not put the solder on the side of the device when soldering, causing a short circuit. Because the CPU is very close to other devices.
Because of my limited ability, I would like to talk about it if I am willing to call CSC to study together.
Because of my professional service THOMSON brand, it has been written for many years. In addition, I am very disgusted, maliciously tampering and copying my own content. For example, a few years ago, Hongsheng appliance repairs tampering and copying my manuscript. As a result, I did it yesterday. In the appliance repair section, everyone is very serious about the column, the result This kind of thing happened, it was disappointing.
I also strongly condemn this kind of behavior. If this behavior is not stopped, it will also promote the infringement, and it will also affect the enthusiasm of sharing experience.