Hi everyone
After years of lurking its my time to come for help
Got a Toshiba 22EL833G with Vestel 17PW05-3 PSU - TV powers on, sound OK, no picture or backlight.
With PSU disconnected - humming/pitching sound on transformer
PL706
Pin 1 - 20.8/22.5
Pin 3 - 0V
Pin 4 - 0V
PL703
Pin 7 - 11.25V
Pin 9 - 5V
Pin 11 - 5.5V
With PSU connected to other boards, on boot - horrible pitching/screaming sound on transformer
PL706
Pin 1 - 20.8/22.5
Pin 3 - 0V
Pin 4 - 3.3V
PL703
Pin 7 - 11.25V
Pin 9 - 5V
Pin 11 - 5.5V
With PSU connected to other boards, ON state - transformer silent
PL706
Pin 1 - 5.5-9V
Pin 3 - 3.1V
Pin 4 - 2.2V
PL703
Pin 7 - 11.25V
Pin 9 - 5V
Pin 11 - 5.5V
C371 - 11.25V
C735 - 29.6V
No visible damaged on boards besides transformer pins (see picture)
No shorts found between transformer coils/ferrite, no shorts found on diodes, transistors or capacitors
Small differences from PSU schematics:
IC700 not ICE3BR1765J but ICE3BR10665J
D715 not present
D712 and D713 not UF5402 but SB5100
C734 not present
I'm missing the obvious or could it something else?
After years of lurking its my time to come for help
Got a Toshiba 22EL833G with Vestel 17PW05-3 PSU - TV powers on, sound OK, no picture or backlight.
With PSU disconnected - humming/pitching sound on transformer
PL706
Pin 1 - 20.8/22.5
Pin 3 - 0V
Pin 4 - 0V
PL703
Pin 7 - 11.25V
Pin 9 - 5V
Pin 11 - 5.5V
With PSU connected to other boards, on boot - horrible pitching/screaming sound on transformer
PL706
Pin 1 - 20.8/22.5
Pin 3 - 0V
Pin 4 - 3.3V
PL703
Pin 7 - 11.25V
Pin 9 - 5V
Pin 11 - 5.5V
With PSU connected to other boards, ON state - transformer silent
PL706
Pin 1 - 5.5-9V
Pin 3 - 3.1V
Pin 4 - 2.2V
PL703
Pin 7 - 11.25V
Pin 9 - 5V
Pin 11 - 5.5V
C371 - 11.25V
C735 - 29.6V
No visible damaged on boards besides transformer pins (see picture)
No shorts found between transformer coils/ferrite, no shorts found on diodes, transistors or capacitors
Small differences from PSU schematics:
IC700 not ICE3BR1765J but ICE3BR10665J
D715 not present
D712 and D713 not UF5402 but SB5100
C734 not present
I'm missing the obvious or could it something else?
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