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Bosch refrigerator control panel not displaying, black screen (blue screen), touch buttons malfunction: Summary of causes and solutions (latest version)
Fault display: The refrigerator display does not show, black screen, no numbers displayed, touch buttons malfunction, unable to use buttons to adjust the refrigerator’s refrigeration and freezing temperatures, and control the refrigerator’s temperature and other functions are not usable.
Preliminary judgment: If the refrigerator display is not bright, it is generally due to a broken display or door wire. You need to open the top hinge plug to check if there is a disconnection between the display and the motherboard inside the refrigerator. If there is no broken connection, it indicates a problem with the display itself, and another possibility is a control panel failure (i.e., motherboard failure).
Analysis of the causes of Bosch refrigerator panel display failure and corresponding solutions: (Several real repair case analyses)
Phenomenon 1: Water droplets caused by large temperature differences often hang on the outer box of the freezing chamber. Setting the button control panel outside the freezing chamber may be a bug of this refrigerator. If the condensed water droplets are not wiped frequently, they will seep into the internal computer board of the control panel, corroding the components on the computer board, causing the buttons to malfunction and be unable to control the refrigerator’s temperature and other functions.
Step 1: Disconnect the refrigerator from power, use tools to pry open the button control panel from various angles with moderate force. There are engineering plastic clips around the panel, so do not use excessive force to break the clips. Gently remove the panel, detach the red clip on the ribbon cable connector, disassemble the lower panel, separate the panel shell, and remove the computer board.
Step 2: The solder joints on the computer board are corroded with green rust due to water, leading to poor contact and button malfunction. Use a cotton swab dipped in alcohol to clean the rust spots. The wiring part of the computer board is covered with waterproof paint. After cleaning the rust spots, use a hairdryer on the cool setting to dry the panel, reconnect the ribbon cable, power on for testing, and the display lights up successfully, with all buttons restored to normal.
Step 3: Reverse the previous steps to reinstall the button control panel on the refrigerator. If this method does not work, the panel assembly may be damaged, requiring replacement of the assembly or professional repair personnel for diagnosis and repair.
Phenomenon 2: The refrigerator control panel suddenly does not display or the display screen is always lit with no display.
Cause analysis:
1. First, we should consider the following several reasons.
2. The refrigerator control panel not displaying may be due to the ribbon cable and connector of the refrigerator display not being securely fixed, causing some looseness and resulting in contact issues.
3. In addition, part of the reason is due to the current supplied to the refrigerator being unstable, and the voltage cannot meet the operational standards of the refrigerator.
4. Another situation is that the refrigerator’s control panel is always lit, but the display shows nothing.
This situation is mainly caused by these three reasons: (1) The display cannot operate normally and has malfunctioned. (2) There is a disconnection between the display in the refrigerator and the motherboard inside the refrigerator. (3) The main control panel inside the refrigerator also has some issues, preventing the control panel from displaying.
Handling method: When encountering the refrigerator control panel not displaying, we can take relevant measures to solve this problem.
Step 1: First, we can frequently open and close the refrigerator door, mainly for refrigeration functions. After several operations, if the refrigerator control panel still does not respond, we can conclude that the wiring inside the refrigerator is broken.
Step 2: If the door control panel for refrigeration does not respond either, we need to use relevant tools to pry open the two small plastic covers on the top layer of the refrigerator.
Step 3: After prying it open, we will see screws inside, and we need to use some tools to remove these screws. There are also screws behind the cover that need to be removed.
Step 4: After completing the above steps, the top cover of the refrigerator can be successfully removed, and some wires will be visible at the hinge of the upper door in the refrigeration area. When these wires are seen, they can be directly unplugged or removed with tools.
Step 5: It is important to check if there are any broken wires after unplugging, as some wires may be broken while the plastic casing remains intact. In this case, it is necessary to pull gently. When a shorter wire is found, it should be connected according to the corresponding color.
Phenomenon 3: The refrigerator display does not show temperature or any numbers.
Cause analysis and handling methods:
This situation is mostly due to the broken refrigerator door wire. First, unplug the power plug, remove the four screws on the top of the refrigerator, take off the top cover, continue to disassemble the upper door hinge, unplug the ribbon cable and refrigerator door, and weld the broken wire. Then reverse the installation of the refrigerator door to complete the repair!
Phenomenon 4: The refrigerator display is black or blue screen, with no display of refrigeration and freezing temperatures.Cause analysis: If this situation is encountered for the first time, it is advisable to first disconnect the power and restart to see if there is any improvement. If the fault persists, check for other reasons. Handling method: Check if the refrigerator display connection is normal. The first time, the repair technician opened the screw cover, and all four screw covers were opened; after unscrewing the screws, the cover was opened, and it was found that the wires connecting the display and the main unit had clearly fallen off; reconnecting them sufficed; the first repair technician used a black wire to reconnect, stating that this could prevent further friction. The second time, since I could not find such a fine wire to connect, I had to slightly open the wrapped wire to facilitate the connection.