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Brand:Bosch Model Number:HBL8750UC/08 Main Symptom: can’t complete/maintain setup What happens & when: Bosch HBL8750UC/08. Oven display was spontaneously reset as if a power outage had occurred. Microwave display was not. I attempted to set time/date on oven and midway through the screen went blank and then three short vertical lines appeared in upper left hand corner of screen. Then, the display returned to configuration it has after a power outage. I also noticed the screen goes blank and the three lines appeared intermittently without any input. I tried using the oven and was able to get it to begin heating, but the spontaneous screen reset with three lines occurred and the the oven display returned to the condition it has after a power outage.
Error Code (if any):
Parts or tests already tried:
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With the power supply turned off, if the wall oven is pulled out by about 4 inches or so, the trim mounting screws around the microwave should be accessible to remove them and the microwave trim. Once the trim is removed, the microwave should be able to lift up slightly then pull forward enough to disconnect the power cord from the oven assembly. The panel that the microwave sat on would need to be removed next. It should be held on by a few screws at each side. Once that is removed, there will be an access panel at the front center-right side of the top. This panel would need to be removed to expose the power relay control. Is there any visible damage or obvious overheating discoloration to the control? Do the wires going from the power relay control to the user interface control have any loose connections or sections that look damaged? If not, a voltage test can be conducted at the power relay control to identify if voltage is flickering out at the relay control or if there is an issue with the display control. With the power turned on, the wires at the power relay control can be tested for Volts DC. When testing from one wire to the other (manufacturer does not identify which wire is DC ground, DC supply, and DC signal), there should be a steady DC voltage between one wire set test, and a pulsing DC voltage on a second wire set test. Once the steady voltage wire test set are identified, the voltage would be watched to see if it turns to 0 Volts DC when the screen fails. If not, the user interface control would be the likely cause of failure. If voltage does drop to 0 Volts DC, the power relay control would be the likely cause. Here are links to both parts for reference.