finlux 42flhk240bhd no backlight

[Kilroys]

Re: finlux 42flhk240bhd no backlight

Perhaps a little help

[MikeyBe]

Re: finlux 42flhk240bhd no backlight

Thanks for that.

[selldoor]

Re: finlux 42flhk240bhd no backlight

WOW! - yes thanks Kilroys - great find.

MikeyBe if you open the pdf using adobe you can search it
If you just type BL into the search you can pretty much see the way it goes to the EN pin.

Also it has the pinout of the connector so we can get going on that. Only slight problem at this end is I am out most of today.

[tom66]

Re: finlux 42flhk240bhd no backlight

Perhaps a little help

Nice find, do you happen to have any more vestel schematics? I can upload them to my site so they are easily found in future. Thanks

[MikeyBe]

Re: finlux 42flhk240bhd no backlight

Well I've leant something...

What I thought was 3.3V is ST_BY. Also, the 7.6V is on the DIM_PWM_ANALOG line... However, I don't think that diagram is 100% identical to by power supply. Pin 11 of PL200 doesn't appear to be connected to anything, however pin 9 has 5V on it.

Still it's making life so much easier.

[selldoor]

Re: finlux 42flhk240bhd no backlight

Can you measure that vCC on IC303 as you switch the set on the 11.4v is ok when it is running but as budm says it needs to go higher than that on startup

[MikeyBe]

Re: finlux 42flhk240bhd no backlight

When first plugged in I get 21V, which after a few seconds drops down to 11.4V, if that makes sense...

[budm]

Re: finlux 42flhk240bhd no backlight

That is OK, that is more thane enough start up voltage which is 18V, once it starts running then voltage can be anything between 11V ~25V range. Since you are getting standby 5V, then it is working (if the pinout of the connector matches the diagram).

[tom66]

Re: finlux 42flhk240bhd no backlight

One thing to be careful of: if you are using an auto ranging meter it can overshoot on turn on, to avoid this you need to lock it on to the range of interest. Most budget autoranging meters suffer from this (Fluke, Agilent, my B&K etc do not...) If the meter is not autoranging this is not a problem.

[MikeyBe]

Re: finlux 42flhk240bhd no backlight

My test equipment at home is limited - a couple of basic non autoranging meters and an aging digital storage scope.

[tom66]

Re: finlux 42flhk240bhd no backlight

That is fine then, we know the meter is not causing this fault for sure if it is not an auto-ranging meter... just something to be aware of.

[budm]

Re: finlux 42flhk240bhd no backlight

BTW, do you have that 24-80VDC at L200, the voltage is generated by SMPS IC201, TRANSFORMER TR200?
And also do you have voltage at VCC pin 16 of the ICMP3394?

[MikeyBe]

Re: finlux 42flhk240bhd no backlight

Well the TV is working...

I resoldered anything that looked iffy. Also, the larger caps that were glued onto the PCB with what looked like black mastic had come away and lifted several PCB tracks with them. Repairing those appears to have got it working again.

Thanks for everyones help.

[selldoor]

Re: finlux 42flhk240bhd no backlight

Wow! well done - and we gained quite a bit of information here.
Hope it keeps going for you