Hitachi l42vp01ub

[sordids999]

Hi repairing this tv for a friend strange red lines going across the screen

[tom66]

Re: Hitachi l42vp01ub

LVDS fully seated? check both ends.
Happens on only one/a few sources or all sources?
Does it affect menu/volume control?
PSU 12V & 5V are OK?

[sordids999]

Re: Hitachi l42vp01ub

Strange my friend told me the the avi and hdmi gave the red lines but the pc lead was fine

12V is 11.7
5V is 4.8
But just removed the cover and running it and all inputs are fine no more red lines ?

[sordids999]

Re: Hitachi l42vp01ub

Ok all back together now I suppose I'll run this a few days to see if it does it again very strange

[tom66]

Re: Hitachi l42vp01ub

...a problem that goes away on its own is also bound to come back on its own.

[sordids999]

Re: Hitachi l42vp01ub

agreed so what you think is the next option ?

[sordids999]

Re: Hitachi l42vp01ub

Ok after the set warms up the audio keeps cutting out then back with a popping noise from the speakers

[tom66]

Re: Hitachi l42vp01ub

I've had this before. Fix:
https://www.youtube.com/watch?v=p0PRbDme8cs

Shitty Vestel.

[sordids999]

Re: Hitachi l42vp01ub

Thanks tom ill check out the video then test it,I luckily have a spare of everything from this model due to a cracked screen TV so...

[tom66]

Re: Hitachi l42vp01ub

A friend of mine also happens to have all the boards from this set. Funny story, we fixed that for him but a month later he decided he wanted to upgrade so he dropped it off the cabinet, smashed it and claimed on his house insurance.

I'm sure it doesn't work out in the long run, some people are really stupid. At least it was free.

[sordids999]

Re: Hitachi l42vp01ub

Oops

[tom66]

Re: Hitachi l42vp01ub

It was most definitely a deliberate act, makes me kind of sad, might only be a shitty Vestel but still a waste.

[sordids999]

Re: Hitachi l42vp01ub

ok turned on the tv this morning red lines are back checking voltages ive noticed the pl802 on the schematics im only getting 22.2 volts compared to 24 volts and the main cap on psu im only getting 330v

[tom66]

Re: Hitachi l42vp01ub

How's the 12V & 5V?

[sordids999]

Re: Hitachi l42vp01ub

picture attached the 12v are reading low

[tom66]

Re: Hitachi l42vp01ub

You have a PFC fault...I've had two like this and never fixed them. I'm sure it is fixable I just haven't invested the time.

[sordids999]

Re: Hitachi l42vp01ub

ok so ill search around for a replacement psu ?

[multimeter]

Re: Hitachi l42vp01ub

try replacing your filter cap,they can cause drops in output voltages aswell,if the pfc circuit is underpowering

[sordids999]

Re: Hitachi l42vp01ub

try replacing your filter cap,they can cause drops in output voltages aswell,if the pfc circuit is underpowering

ok thanks which one is that ?

[multimeter]

Re: Hitachi l42vp01ub

ok thanks which one is that ?

the largest cap(s) on the psu,normaly between 47uf-150uf ,450v range,in the primary side,after the bridge rectifier