Vizio V042L FHDTV10A No Video but has sound

[stp715a]

Re: Vizio V042L FHDTV10A No Video but has sound

do you have any backlights at all?

Yes, backlights. Picture is normal for a few seconds. Has the symptoms I have seen numerous times with bad caps in the PS but they look and test fine with ESR meter.

[Dgtech]

Re: Vizio V042L FHDTV10A No Video but has sound

It sounds like your inverter boards are working correctly - at least for the most part. Check and comapare the resistances of the transformers, master to slave and slave to master.

[stp715a]

Re: Vizio V042L FHDTV10A No Video but has sound

It sounds like your inverter boards are working correctly - at least for the most part. Check and comapare the resistances of the transformers, master to slave and slave to master.

Slave Inverter, both transformers: P1 to gnd = 2M ohm, P2 to gnd = 2M ohm
Master Inverter, both transformers: P1 to gnd = 40 ohm, P2 to gnd = 40 ohm

Thanks for all the suggestions and responses.

[stp715a]

Re: FIXED: Vizio V042L FHDTV10A No Video but has sound

Slave Inverter, both transformers: P1 to gnd = 2M ohm, P2 to gnd = 2M ohm
Master Inverter, both transformers: P1 to gnd = 40 ohm, P2 to gnd = 40 ohm

Thanks for all the suggestions and responses.

Problem was master inverter board. Symptoms were the first screen (type of connection) would blink on for 3-8 seconds then go to a black screen. Could not get past the initial screen so could not use sound as a symptom.

The Db9897FS IC was bad on the master inverter. Purchased new boards from China. They both worked as did the old slave inverter. The Db9897FS chip was bad on the master inverter. This was verified through a series of tests including comparing readings to the new working to the old non-working. Will be posting in the sale section the working slave inverter and the master inverter with the defective Db9897FS chip. Will include a new Db9897FS for anyone who wants to solder the new one in on the master.

Thanks