HP L1906 power supply failure

HP L1906 PCB

HP L1906, manufactured in February, 2007, model no. HSTND-2L09

Symptoms unknown; screen was not powered on before disassembly.

Electrolytic capacitors C822, C823 and C824 (1000 µF/10 V, bottom center of image) had failed. They are situated on a 5 V rail and can be substituted by 6,3 V units. They were successfully replaced by various used low-ESR capacitors. C824 and C822 are connected in parallel and can be replaced by one 2200 µF component.  The 35 V capacitors on the inverter power rail were in good condition and as such were not replaced.

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