Sanyo FW42D25T

[nomoresonys]

Re: Sanyo FW42D25T

didnt have a 10uf 50v cap handy for the orange cap, threw a 47uf 50v in there.

[nomoresonys]

Re: Sanyo FW42D25T

Only getting voltage there, only millivolts or 0 volts everywhere else, no voltage on cold side no voltage on any coil or cap except filter cap no voltage on UL1, UL2 or eeprom, maybe problem with transformer?:

[nomoresonys]

Re: Sanyo FW42D25T

oops I lied, there is 170 volts on 2 pins of the transformer on hot side.

[nomoresonys]

Re: Sanyo FW42D25T

.

[R_J]

Re: Sanyo FW42D25T

For the primary smps ic to operate it first needs vcc voltage, what do you measure on the vcc pin of the ic?

[nomoresonys]

Re: Sanyo FW42D25T

not sure, is that ic on the primary/hot side? I don't see any ic on the hot side.

[R_J]

Re: Sanyo FW42D25T

It is on the primary side. There will be a small driver ic, likely a smd 6 pin, this ic drives a power mosfet that switches the primary of the main transformer to produce the secondary voltages.

[lotas]

Re: Sanyo FW42D25T

not sure, is that ic on the primary/hot side? I don't see any ic on the hot side.

Remove the heatsink and you will see UB101 PWM (6pin.).

[nomoresonys]

Re: Sanyo FW42D25T

Thanks gentlemen, any way to verify UB101 is not working, like testing QB101 or DB106? QB101 has 170 v on middle pin, 0 v on the other two, DB106 tests good in diode mode, has 170 v on each end.

[R_J]

Re: Sanyo FW42D25T

What is the top marking on the ic? what is the vcc voltage?

[nomoresonys]

Re: Sanyo FW42D25T

would have to remove heatsink to get to it, was hoping there was another way to proof it out.

[diif]

Re: Sanyo FW42D25T

A simple desoldering job that should take less than 5 minutes, what's the issue?

[diif]

Re: Sanyo FW42D25T

Any progress on this? What soldering iron do you have?

[nomoresonys]

Re: Sanyo FW42D25T

already moved on, this one isnt worth time or energy.

[diif]

Re: Sanyo FW42D25T

For the sake of a 5 minute soldering job
Do you not have a decent soldering iron?

[nomoresonys]

Re: Sanyo FW42D25T

to what end, no time for it, if you want it just hop on over and it's yours, no charge.

[nomoresonys]

Re: Sanyo FW42D25T

its an old tv from 2012, theres no value there, was only looking at it for the puzzle factor but really not curious enough to mess with it anymore.

[nomoresonys]

Re: Sanyo FW42D25T

I for sure appreciate the help from Lotus and RJ but this one isn't worth wasting anyone's time on.

[nomoresonys]

Re: Sanyo FW42D25T

Having a little revisit with this one board pos, think it's bad backlight/s, current situation, tv comes on fine, goes blank screen after about a minute or so, sound still there, passes flashlight test, voltage on big caps is about 164 both when working with picture and when it goes dark, I don't know much about these one board tvs, do you think that it is only suppose to have 164 and not go any higher or is something else wrong other than backlights?

[nomoresonys]

Re: Sanyo FW42D25T

Anyone know if these are supposed to have boosted voltage or not?