17PW26-3 Issue: Flashing Blue Light on TV

[speedypro]

This board came in with no display. Replaced few caps and was well. About a week later, tv returned dead; no power, nothing. Looked inside and yellow oval (in picture) was shorted. Replaced it and fuse blew (red). Replaced green and fuse stood strong. The new issue is that the blue light on tv just kept blinking/flashing. What is needs replacing?

I've took the transistors from an old board. Do I need new trans (green oval)?

The TV: Hitachi 42hxt42u

[dick_barton]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Transistors and mosfets are not always interchangable due to their characteristics. What part numbers did you take out and what part numbers did you use to replace them?

[ReeceyBurger123]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Your driver circuit and device that switches the voltage to the driver might be damaged, will link video of this repair by Tom66.

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Transistors and mosfets are not always interchangable due to their characteristics. What part numbers did you take out and what part numbers did you use to replace them?

Oh!

Original: p9nk50zfp
Replaced with: fqpf9n50c

[ReeceyBurger123]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Oh!

Original: p9nk50zfp
Replaced with: fqpf9n50c

That will work fine that part will.

[ReeceyBurger123]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Watch this:

https://m.youtube.com/watch?v=u1gWvF1erzU

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Your driver circuit and device that switches the voltage to the driver might be damaged, will link video of this repair by Tom66.

Ok. I'll wait for video link. Thanks.

[ReeceyBurger123]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Ok. I'll wait for video link. Thanks.

Linked it lol check above.

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Linked it lol check above.

Ok. Mine seems the same. I'll grab a BD140 off ebay and report.

[ReeceyBurger123]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Ok sweet have you checked it ? Also check the controller too.

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Ok sweet have you checked it ? Also check the controller too.

Just saw this. Ok, replaced IC806 and BD140, both of which are brand new but same flashing blue light. Would the main av board has anything to do with this?

Also check the controller too.

Is that IC806?

[ReeceyBurger123]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Wait there a second, unolug the Mb from the psu and apply power to the Tv. Check if you get 24v and other voltages like 12v and 5v from the Mb connector first to see if the Psu is working.

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Wait there a second, unolug the Mb from the psu and apply power to the Tv. Check if you get 24v and other voltages like 12v and 5v from the Mb connector first to see if the Psu is working.

Got a service manual to see which pins has what voltage? I've place my multimeter (-) where the black wire goes and probe the rest with (+) and got 5v and 6v. No 12v nor 24v.

[vinceroger69]

Re: 17PW26-3 Issue: Flashing Blue Light on TV


check also d882 d883 as read these can go sc

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Thanks. No 12v, no 24v

[vinceroger69]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

did you see my edit above too check two diodes

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

did you see my edit above too check two diodes

Yes, I have. tested ok.

[vinceroger69]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Maybe reece has some more ideas is the pfc circuit working ok ? not sure if it needs this too get the missing voltages running etc

[dick_barton]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Have you got +400V

[speedypro]

Re: 17PW26-3 Issue: Flashing Blue Light on TV

Have you got +400V

I assume ac? No voltage ac