I have a 42" Vizio VW42L that I'm trying to fix. I've extensively read all the posts I can find about this unit, but I'm stumped. I'm getting the white logo/amber logo, but no sound, picture, backlight. I can turn the set on and off.
The power supply only puts out 5v until I unplug the inverter boards. They I get 5.13 v, 24.25 v, but only 10.75 v instead of 12. Both inverter boards were bad, the master had swollen caps, the slave had a blow chip and bad mosfets. I bought replacement boards instead of redoing both boards, doing the zener mod, etc. The set still doesn't work and the power supply still doesn't turn on unless the new inverters are unplugged.
The large 450 volt cap 150 mf cap on the power supply reads 170 when plugged in and 400 when powered on, and since the 24 volts is correct, I'm thinking the high voltage side of the board is good, and that there is something wrong with the 12 volt step down portion of the board. The board looks flawless, no burns, no swollen caps, all fuses on all boards are good, etc.
I have the DPS-260HP-1 Power Supply Board, and I'm going to attach a few pictures. The overall is a bit blurred, I can reshoot as necessary, or add closeups once I know what is needed.
Any ideas where to look? Is this a control issue, or simply a bad regulator? Unfortunately, due to the position of the 12 volt regulator behind the transformer, I can't read the part number without pulling it out. The service manual was...unhelpful.
Thanks
The power supply only puts out 5v until I unplug the inverter boards. They I get 5.13 v, 24.25 v, but only 10.75 v instead of 12. Both inverter boards were bad, the master had swollen caps, the slave had a blow chip and bad mosfets. I bought replacement boards instead of redoing both boards, doing the zener mod, etc. The set still doesn't work and the power supply still doesn't turn on unless the new inverters are unplugged.
The large 450 volt cap 150 mf cap on the power supply reads 170 when plugged in and 400 when powered on, and since the 24 volts is correct, I'm thinking the high voltage side of the board is good, and that there is something wrong with the 12 volt step down portion of the board. The board looks flawless, no burns, no swollen caps, all fuses on all boards are good, etc.
I have the DPS-260HP-1 Power Supply Board, and I'm going to attach a few pictures. The overall is a bit blurred, I can reshoot as necessary, or add closeups once I know what is needed.
Any ideas where to look? Is this a control issue, or simply a bad regulator? Unfortunately, due to the position of the 12 volt regulator behind the transformer, I can't read the part number without pulling it out. The service manual was...unhelpful.
Thanks
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