StGeorge
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Nov 25, 2015, 3:23 AM
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Sanyo DP26746 Unusually Hi Voltage (Pwr Board)
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This TV was given to me with the symptom that 'after powering up the picture came on after warm-up, then went away with no audio either'. The screen is totally back-lit, so the T-con board is probably good. Driver boards, uncertain.
I was doing a power supply voltage check (component side of board) when my DMM probe accidentally touched across lead 3 & 4 of the tiny (close together) 4-legged diodes of either diode D605 or D606. It was just for a nano second, and the TV went into shutdown. Powered it back up and the TV picture came on perfect, but with very low audio. But now there are 28DC volts everywhere - at the 5V standby point, the DTV 6V point, the A13V line & the P24V line. I may have opened or disabled a voltage regulator circuit. I can't just let this 28V reading run wild, as my mentoring from CA TV repair and classes I took told me that something is wrong somewhere if voltages are off that much. I realize that there was something intermittently wrong before I started my check, so I may have multiple problems now.
Any ideas, other than getting the oscilloscope out with the curve tracer and start checking parts? Thanks for any help or troubleshooting suggestions.
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