Smart lock repair world: The official 400 phone is actually outsourcing, and the small fault report is 1,800 yuan

——Insighting the smart home after-sales black product chain

1. Real case: The battery exchange price is 1,800 yuan

On February 25, 2025, Ms. Zhang from Wuhan Optics Valley found that the smart lock prompted insufficient power, so she called the report phone on the instruction manual. After the repairman came to the door, he said: \”The motherboard is corroded by a battery leakage, so the whole set must be replaced\”, and the price is as high as 1,800 yuan. After Ms. Zhang refused to repair it, she received a 380 yuan account for \”Gate Test Fee\”.

Follow the market supervision department to investigate:

• The 400 phone is actually a third-party outsourcing company
• The real fault is only a poor battery contact (the maintenance cost is 0 yuan)
• The company involved received 217 similar complaints within six months

2. Industry status: The interest network behind 400 phones

1. Telephone outsourcing industry chain

2. Three major tricks of ruling gurus
① \"System level failure\" may be scary: Absolutely bad battery contact is \"motherboard burning\"
② Accessories price foggy: A lock tongue price of 480 yuan for a cost of 30 yuan
③ Man creates faults: Intentionally breaking the position spring when you go to the door

3. Deep disassembly of the dark curtains in repair

1. Accessories profit-making system
Taking a certain brand of C-level locking core as an example:

• Stock purchase price: 85 yuan
• Output price of outsourcing companies: 120 yuan
• Customer quote: 680 yuan
  The huge profit rate reaches 467%

2. Engineer training and training

• \"Show customers raw parts (reported in advance)\"
• \"Show customers raw parts (reported in advance)\"
• \"Strengthen the professional vocabulary of \'Public Security Preparation\'\"

3. Protection barrier design

• No maintenance work orders are provided
• Cash is transferred to personal account
• Official warranty does not leave any warranty

IV. Consumers\' pit prevention guide

1. Three-step process for official channel verification
① Log in to the official brand website to inquire 400 phone number (non-instruction book printing number)
② Ask the engineer to present the \"Stock Authorized Electronic Certificate\"
③ Verify corporate qualifications through the \"National Government Service Platform\"

2. Price comparison tool