Toshiba BDX2500KU, Service Manual

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Trouble shooting chart
All output voltages on the Power board is 0V or deviated.
11-5
All output voltages on
the Power board is 0V
or deviated.
Check whether FU1 is blown.
Check whether there is
130V on C8.
Check whether there is
feedback signal on pin2 of U1.
Yes
Yes
Yes
Yes
Yes
Check whether the components in the
short-circuit voltage are defected or eroded.
Replace FU1 or replace Power PCB.
Check/Replace U1 or replace Power PCB.
Check whether U1 are eroded.
Replace C8 if D17, D19, D20,D21 are
normal or replace Power PCB.
No
No
No
No
U1 (PIN3 - FB waveform)
U1 (PIN6-Drain waveform)
Check if +5V,+12V are short.