Hi all,
Toshiba 19BL502B replaced diode worked, now not working
Toshiba 19BL502B Main Board 23039106 PSU Vestel 17pw05-3 150411/23020632
Was Dead, found D709 centre diode shorted, removed put on briefly on and worked ok. Replaced all 3 diodes, RS did not have UF5408 in stock so used G1751. Worked ok for couple of days, then not working green light on but no picture. There was a smell of burning. Found the 3 diodes very hot and 2 Capacitors were warm C729, C730. Replaced the 3 16 volt 1000ยต capacitors C729, C730, C731, but still not working, goes from standby to ON green steady light but no picture.
With Main Board disconnected Volts on PSU 11.5 DC Volts/24 DC volts, with Main Board connected in standby volts on PSU 8.69 DC Volts/20.8 DC Volts, turning it on 11.8/33 DC volts, and the 3 diode get very hot. To me this would suggest the Main Board is drawing a lot of current, although the 12v DC is low, and why does the 24 volts go up to 33 volts.
Any advice would be greatly appreciated.
Thanks David.
Toshiba 19BL502B replaced diode worked, now not working
Toshiba 19BL502B Main Board 23039106 PSU Vestel 17pw05-3 150411/23020632
Was Dead, found D709 centre diode shorted, removed put on briefly on and worked ok. Replaced all 3 diodes, RS did not have UF5408 in stock so used G1751. Worked ok for couple of days, then not working green light on but no picture. There was a smell of burning. Found the 3 diodes very hot and 2 Capacitors were warm C729, C730. Replaced the 3 16 volt 1000ยต capacitors C729, C730, C731, but still not working, goes from standby to ON green steady light but no picture.
With Main Board disconnected Volts on PSU 11.5 DC Volts/24 DC volts, with Main Board connected in standby volts on PSU 8.69 DC Volts/20.8 DC Volts, turning it on 11.8/33 DC volts, and the 3 diode get very hot. To me this would suggest the Main Board is drawing a lot of current, although the 12v DC is low, and why does the 24 volts go up to 33 volts.
Any advice would be greatly appreciated.
Thanks David.
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