After eating breakfast and coming out of the cafeteria, Xu Hongwen walked to the notice board outside the cafeteria to see if there was a big class he liked today, Xu Hongwen quickly glanced at it and didn't find that he was interested.

The curriculum of doctoral students is not as tight as imagined, and there is a lot of free time to read special books to accumulate knowledge, and doctoral supervisors will also take their own students when doing scientific research projects, so that they can exert their own creative thinking and accumulate experience in the project; Of course, the seemingly relaxed and free doctoral students are also under great pressure to study, but these will not bother Xu Hongwen now!

Perhaps because of his vision, Xu Hongwen was not interested in the big class on the announcement, and knocked on the enamel bowl in his hand, because now there is no pressure on learning, there is no difficulty for him to complete a high-quality doctoral dissertation and defend it, the school can no longer improve his professional ability, and Xu Hongwen, who does not want to waste time, feels that the main task now is to make money.

After going to the real yàn room and taking out a few tools for repairing the eldest brother, Fang Hong went back to the dormitory, and just returned to the dormitory, he didn't expect Cheng Cheng to be there.

"Cheng Cheng, you didn't go to class!"

"Isn't this saying that Brother Wen, you can cultivate Big Brother, I just called my classmate's house to tell me about it, and he said that he would rush over now!" Cheng Cheng, who was sitting in the dormitory and didn't have time to eat breakfast, saw Xu Hongwen go and returned, and when he saw the tools that Brother Wen was still holding in his hand, he thought that Brother Wen didn't go to class specifically for his business.

Hearing Cheng Cheng say that his classmate was coming, Xu Hongwen put down the things in his hand and said, "That's okay, I'll fix it now, and I'll take it directly when your classmate comes!" ”

"Ah, so fast!" Although Cheng Cheng was a little surprised in his heart, he hurriedly took out the eldest brother and gave it to Xu Hongwen.

Xu Hongwen, who smiled, took over the big brother like a brick, this big man is far less complicated than the design of the mobile phone of later generations, after removing the battery, he picked up a small screwdriver and quickly removed the screws on the big brother, looked back at Cheng Cheng who was staring at him with big eyes, and said with a smile: "This big brother is very easy to dismantle, as long as you look at it once, it will be dismantled, of course, you still have to be careful when dismantling!" “

After Xu Hongwen used his fingernails to cut into the cracks of the big brother's shell, his hands were a little harder, just now a whole shell has been cracked from the middle, and you can see the motherboard and wiring inside from the outside, the electronic parts on the big brother's motherboard are not all patch welding process, there are many electronic parts that are still welded by the plug-in process, because the plug-in welding takes up a lot of space, coupled with the integration of the motherboard and the limitations of electronic technology at that time, which caused the big brother to be big.

After the big brother's shell is separated, there are still several lines that are connected to each other, Xu Hongwen carefully separated those connected accessories with a camera, and the front and rear shells of the big brother are really separated after separation.

Xu Hongwen carefully inspected the motherboard of the big brother, and did not find that the part was soldered off and soldered, and the solder joints of the antenna connection line did not fall off.

Cheng Cheng, who was watching on the side, also saw that Xu Hongwen's face had changed, and he was already a little worried, his palms were sweating at this time, tens of thousands of yuan were still very important in the early nineties, and he also made a package ticket with his classmates just now, if Brother Wen didn't fix it, he really couldn't explain it.

Xu Hongwen checked the soldered parts on the motherboard again, and still did not find the problem of desoldering and virtual welding, and measured the capacitance and resistance near the power amplifier with a multimeter, and it was normal to measure it again; It's just that the machine can't be disassembled and can't install the battery, and there is no professional power supply, although there is no way to measure the input and output voltage of each pin on the power amplifier chip, at this time Xu Hongwen already thinks that the power amplifier chip is broken.

Xu Hongwen, who had this judgment in his heart, put down the things in his hand, and saw Cheng Cheng looking at himself with a nervous face, in fact, Xu Hongwen didn't expect this situation at first, I heard them say that this big brother was still broken, and it was hard to say whether the big brother was resistant to falling Xu Hongwen, but if it was said that it was really rare to break the power amplifier chip, and there was no obvious damage to the big brother's shell, which means that the fall was not heavy, and according to normal circumstances, it would only cause the parts on the motherboard to be desoldered.

Xu Hongwen worked in Motorola's after-sales technology department in his previous life, but that experience has passed for too long, and later he was doing technology research and development and design, and the technical principles on the motherboard are very clear, the most important thing is that he has not been an executive for a long time.

"Cheng Cheng, I checked the motherboard just now, and I didn't find any desoldering!"

Hearing what Xu Hongwen said, Cheng Cheng hurriedly asked nervously: "What is that broken, can it still be repaired?" “

"Now this situation may be that the amplifier chip is broken!"

"Power amplifier, do you have this kind of power amplifier chip when you are in the room!"

"I'm afraid this kind of chip can't be found in the whole Haizhou!"

"Ahh So what to do? It's not like this big brother can't be repaired! “

Xu Hongwen was a little embarrassed when he saw Cheng Cheng in a hurry, he was too full of words just now, but he didn't expect this to be such a situation, there is really no way to repair this big brother without new accessories; Xu Hongwen thought about it carefully, the big brother didn't fall hard, there is no reason to break the integrated circuits in the chips on the motherboard, the most important thing is that the chips on the motherboard are all finger-pinned, and it is obvious that there is really a virtual soldering!

Xu Hongwen, who couldn't figure it out, couldn't say anything at this time, so he picked up the input power point of the big brother's motherboard again and soldered two wires, and asked Cheng Cheng to help the power cord connected from the motherboard to the positive and negative poles directly on the battery, seeing that Cheng Cheng pressed it tightly after Xu Hongwen turned on the big brother, after turning on the machine, Xu Hongwen tested it with a multimeter, and the input and output signals of the chip on the motherboard were normal, no problem! Even the signal output on the antenna connection line is normal.

Cheng Cheng, who was helping on the side, was relieved to know that the power amplifier chip was fine!

After the test, Xu Hongwen has ruled out the problem on the motherboard, because the mobile phone antenna of later generations is completely different from the current big brother, Xu Hongwen, who entered the thinking misunderstanding at the beginning, never thought that it would be the problem of the antenna, and now he took a closer look at the big brother's antenna shrapnel, and the rubber shell of the locking screw was cracked, causing the shrapnel to be disconnected from the antenna.

After discovering this problem, Xu Hongwen pointed it out to Cheng Cheng and said with a smile: "Cheng Cheng, the problem is here!" “

Cheng Cheng looked at the place Xu Hongwen pointed to, and after looking at it for a while, he saw it clearly, and then said in surprise: "Brother Wen, it seems that it is really a problem in this place, the antennas are separated from the shrapnel!" “

After knowing what the problem was, Cheng Cheng's mood was much better, and he said jokingly: "Brother Wen, you really scared me when you said that there was a problem with the power amplifier chip just now, but I didn't expect it to be similar to the problem you started to say!" “

"I didn't expect it to crack here!" After sighing, Xu Hongwen said to Cheng Cheng with a smile: "Haha, I don't know who was so nervous just now that my hands trembled!" “

……

Laughing, Xu Hongwen had fixed the shrenchel on the antenna, and quickly reassembled the big brother, and after rebooting, the signal had been restored to normal, Xu Hongwen fiddled with it a few times and handed it to Cheng Cheng, and said: "You make a phone call and try!" “

Cheng Cheng, who had just answered the phone, was about to call home to try Big Brother, when the dormitory door was pushed open from the outside!

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