Vivo Y15s Network Problem Solution Jumper Way

Vivo Y15s Network Problem If you're facing network issues on the Vivo Y15s such as "No Service," "Emergency Calls Only," or no signal detection, and basic software resets or firmware flashing haven't resolved the issue,

it's likely a hardware fault in the RF (Radio Frequency) section of the motherboard. One effective solution is using the jumper way method to restore broken or disconnected signal lines on the PCB.

Post Index:Vivo Y15s Network Problem Begin by closely inspecting the network section of the motherboard using a magnifying glass. Look for any damaged or burnt components, corroded tracks, or lifted pads—especially around the network IC, antenna lines, and SIM slot connections.

Use a digital multimeter in continuity mode along with a color-coded PCB diagram to trace and test key signal lines such as RF_ANT_PRX_ANT_TXM, RF_B1_TRX_TXM, or RF_2G_LBT_RX_RFIC. If any line is found to be open or broken, it needs to be restored using a jumper wire.Vivo Y15s Network Problem

To perform the jumper way repair:

Identify the two endpoints of the broken path using the PCB diagram.

Carefully solder a thin insulated copper wire between those two points.

Ensure the jumper does not touch or short any nearby components.

Use UV glue or tape to hold the wire in place and prevent movement.

Replace any faulty SMD components (capacitors, resistors, inductors) along the line, if needed. Only consider replacing the network IC if all other elements are confirmed to be working and the fault persists.

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Vivo Y15s Network Problem After completing the jumper work, reassemble the phone, insert a valid SIM card, and check for signal detection. Use service codes like ##4636## to verify network registration, signal strength, and connectivity. With proper diagnosis and jumper work, most network problems on the Vivo Y15s can be successfully resolved.

Vivo Y15s Network Problem Solution Jumper Way

Vivo Y15s Network Problem One of the frequent network-related issues encountered in Vivo Y15S devices includes messages like “No Service,” “Emergency Calls Only,” or general network connectivity failures. These problems are quite familiar to both mobile and hardware repair technicians. While minor issues can often be fixed with a factory reset or firmware reinstallation, more persistent problems typically stem from hardware faults, particularly within the RF (Radio Frequency) section of the motherboard. This guide offers a comprehensive step-by-step troubleshooting process, supported by a high-resolution PCB diagram, to help repair professionals and technical teams accurately diagnose and resolve network issues in the Vivo Y15S.

Understanding the Network Section of the Vivo Y15S

Vivo Y15s Network Problem The network section in the Vivo Y15S is responsible for handling all mobile communication functions, including voice calls, SMS, and mobile data across 2G, 3G, and 4G networks. This area of the mainboard is made up of various components such as integrated circuits (ICs) and surface-mounted devices (SMDs), all of which are interconnected through intricate copper pathways etched into the PCB. Any damage or fault in these tracks, connection points, or within the network-related ICs themselves can disrupt signal reception, leading to issues like weak signals, dropped connections, or complete network failure.

Identified Components and PCB Track Details

In the upper-right section of the PCB image, you'll find the primary components responsible for network transmission and reception. This area includes key chips that manage band-specific filtering, antenna connections, and SIM card interface points.

Color-Coded PCB Pathways

Vivo Y15s Network Problem Green-colored traces on the board highlight signal paths like RF_ANT_PRX_ANT_TXM, which are involved in both sending and receiving signals between the antenna and the RF circuitry.

Yellow and orange lines indicate the main RF band routes, such as RF_B1_TRX_TXM, which handle core transmission and reception functions across supported frequency bands.

Additional RF Band Pathways and Connection Details

Vivo Y15s Network Problem The purple, pink, and red traces on the PCB represent secondary RF signal paths, supporting additional frequency bands such as 2G and various multi-band RF signals (e.g., RF_2G_LBT_RX_RFIC). These lines complement the primary RF routes by enabling broader network compatibility and fallback options.

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Each color-coded track leads to clearly marked connection points on the board, ending at specific pins or SMD components. These may include resistors, capacitors, inductors (coils), or exposed contact pads—each playing a role in filtering, routing, or conditioning the RF signals within the network circuitry.

Steps to Repair Network Issues on the Vivo Y15S

Vivo Y15s Network Problem Visual Inspection: Start by examining the motherboard under a magnifying glass. Look carefully for signs of corrosion, burn marks, micro-cracks, or loose/broken solder joints—especially around densely packed chip areas and near the network IC section.

Focus on Network IC Zone: Pay close attention to the components surrounding the network IC. Hairline fractures or lifted solder joints in this region can disrupt signal transmission and reception.

Line Testing with Multimeter: Use a multimeter along with the color-coded PCB diagram to test continuity along each network-related line. Document any open lines and note which IC or component each faulty path is connected to.

Reflow Weak Solder Points: If you identify cold or broken solder joints, gently reflow them using a hot-air rework station. Concentrate on the IC pins and paths highlighted in the color diagram for accurate targeting.

Component Replacement: Replace any shorted or visibly damaged passive components like capacitors, resistors, or inductors. Swap out the network IC only if all other elements test fine and the IC is confirmed to be defective.

Vivo Y15s Network Problem Reconnecting Broken Tracks: If any PCB track is damaged or cut, use fine-gauge jumper wire to reconnect the line. Refer to the color guide for the correct routing. Secure the jumper with adhesive or tape to prevent movement.

Reassembly & Signal Test: Once all repairs are completed, reassemble the device and insert a known-working SIM card. Test for signal reception across all bands (2G, 3G, 4G) both indoors and outdoors.

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Network Diagnostics: Use the service code ##4636## to access network diagnostics. Confirm that the device is registered on the network and all signal parameters are within normal range.

Final Function Check: Complete the repair process by verifying that calls, SMS, mobile data, and SIM card detection are functioning correctly. This ensures the network issue has been fully resolved.