Hitachi l42vp01ub

[sordids999]

Re: Hitachi l42vp01ub

Ok changed that had a spare from another psu the same model but voltages still the same

[tom66]

Re: Hitachi l42vp01ub

the fault with these I believe is the PFC controller or the VCC to it. I have only done a preliminary investigation nothing thorough. Sometimes the cap goes bad, this usually ills the MOSFET/diode though.

[multimeter]

Re: Hitachi l42vp01ub

may be a light thing,but in the corner of the heatsink of the power supply,just to the right of the large transformer with copper coils showing,looks like a capacitor there,in the reflection of the heatsink it looks like a split in the top of it,cant quite see?,have a check

[sordids999]

Re: Hitachi l42vp01ub

may be a light thing,but in the corner of the heatsink of the power supply,just to the right of the large transformer with copper coils showing,looks like a capacitor there,in the reflection of the heatsink it looks like a split in the top of it,cant quite see?,have a check

hi multi where do you mean m8 i cant see much ?

[multimeter]

Re: Hitachi l42vp01ub

false alarm,that picture is better,cap looks fine,must have been reflection

[sordids999]

Re: Hitachi l42vp01ub

ok no problem thanks anyway question.... i need 17PW16-2 V1 190608 but all im finding is 17PW16-2 V1 151206 does it matter they look the same ?

[tom66]

Re: Hitachi l42vp01ub

Should be fine.

[sordids999]

Re: Hitachi l42vp01ub

ok so had a spare psu fitted that 12 volts are now upto 11.5 volts and the 5 volts are now 4.7 volts,even the 24 volt invertors are now 23.5 volts but still i have the red lines ive attached a video to show this im sure i have all replacement parts to swop around for this tv so..... its going to be a long night

http://www.youtube.com/watch?v=UuDOuVUm35I

[tom66]

Re: Hitachi l42vp01ub

I'd swap main board first, then t-con; if they are fine, I cannot see anything else causing this (they could be bad boards possibly.)
At least I think that the panel is fine.

[sordids999]

Re: Hitachi l42vp01ub

Typical board numbers match up but some connections different, so I think I'll take a chance on ordering a replacement board and praying it's not the screen after all my friend did say originally he could use the pc connection fine but avi and hdmi played up

[multimeter]

Re: Hitachi l42vp01ub

connect another tv to the tv being repaired via a scart lead,hdmi lead etc

does the lines go away?it will confirm the mainboard is working if they disappear.,if still there ,then likely the mainboard is fried.

[tom66]

Re: Hitachi l42vp01ub

I'm not aware of any method where a TV will output image over HDMI? Some TVs do it via SCART, but beware this is often not a processed signal. It is simply switched through to the output, only thing that would cause issue with it is a supply rail going missing.

[multimeter]

Re: Hitachi l42vp01ub

ive only ever tried it via scart,tv link to link..,the output video signal should still be a proccesed signal,coming from the video processor on the main board,if this bga chip or whatever it is that is processing the video has gone bad,it will output bad video on the donor tv via scart,and obviously the tv being fixed.

and it could narrow it down to either the t-con or panel fail.

im not saying that it works for all tv's,but it has worked twice for me,mainly on re-badged tv's

[sordids999]

Re: Hitachi l42vp01ub

Ok tried it but nothing

[multimeter]

Re: Hitachi l42vp01ub

Ok tried it but nothing

nothing as in what?,black screen/picture/the same?,have you switched the working tv through to its av channel?,scroll through each input on good tv.

if your not getting nothing then it has to be a mainboard fail.

ive never seen a T-CON displaying those kind of lines before,vertical yes,horizontal no.

[tom66]

Re: Hitachi l42vp01ub

ive only ever tried it via scart,tv link to link..,the output video signal should still be a proccesed signal,coming from the video processor on the main board,if this bga chip or whatever it is that is processing the video has gone bad,it will output bad video on the donor tv via scart,and obviously the tv being fixed.

If it has OSD, it is processing it, in my experience though most do not do any processing, that is expensive, simply a pass through engaged when inputs are inactive.

[sordids999]

Re: Hitachi l42vp01ub

Yeah wired up the tvs via hdmi leads but tried switching channels on the main tv but won't show nothing

[sordids999]

Re: Hitachi l42vp01ub

Definitely a intermittent fault somewhere now the tv is working fine

[multimeter]

Re: Hitachi l42vp01ub

Definitely a intermittent fault somewhere now the tv is working fine

hmmm,dry joints?,you said you connected via HDMI?,something just jogged my memory,have you blasted out the hdmi ports with contact cleaner?,they can cause this issue also through dust hairs etc,as with a hdmi lead that is not inserted correctly.

connecting using scart only,my typo error in previous post,it wont output in hdmi .only scart,my bad .

[sordids999]

Re: Hitachi l42vp01ub

Spoke to his girlfriend last and got a different story lol quote:
It worked properly but we kept losing signal and id have to wiggle the ariel on the bk to get picture back and sometimes it would go and I wouldnt be able to get it back for a few hours also when using scart it would cut out, wasnt all the time but every few days. Picture wise it was perfect no red lines or anything. When I used the pc through it I never had 1 problem