Old git need help Goodmans LCD TV dead ..

[selldoor]

Re: Old git need help Goodmans LCD TV dead ..

Hi - Guess you are in UK? As Goodmans common here.

Is This What your looking for
http://www2.cricklewoodelectronics.c...roductid=21108

Looks like £5 plus vat Inc Postage or you can collect if you know
anyone near cricklewood. I live near a CPC but they dont seem to stock them - cant see them at maplins either
Or there is this one on ebay (if you can wait for it) http://www.ebay.co.uk/itm/NCP1200-NC...item415961bca3

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

Cheers for the links, I had completely forgotten about Cricklewood, I used to get stuff from them , must be 25 years back !! in my Hifi building days.

Got a couple of IC's and some fuses on order.

thanks

Chris

Hi - Guess you are in UK? As Goodmans common here.

Is This What your looking for
http://www2.cricklewoodelectronics.c...roductid=21108

Looks like £5 plus vat Inc Postage or you can collect if you know
anyone near cricklewood. I live near a CPC but they dont seem to stock them - cant see them at maplins either
Or there is this one on ebay (if you can wait for it) http://www.ebay.co.uk/itm/NCP1200-NC...item415961bca3

[retiredcaps]

Re: Old git need help Goodmans LCD TV dead ..

Got a couple of IC's and some fuses on order.

Don't forget the caps. Capxon is about the worse brand of capacitors there is in the lcd world.

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

finally got all the Caps odds sizes for most shops round here..

But all recapped . new IC in socket.. new fuse ..

whilst waiting, been round the board with meter .. looks like ZD101 is shorted . so another bit to get !

A bit hard to see what ident is on there .. looks abit like Z208 ( or B ?) .. possibly a small p on the end ?

Any clues ?


thanks
Chris

[PlainBill]

Re: Old git need help Goodmans LCD TV dead ..

finally got all the Caps odds sizes for most shops round here..

But all recapped . new IC in socket.. new fuse ..

whilst waiting, been round the board with meter .. looks like ZD101 is shorted . so another bit to get !

A bit hard to see what ident is on there .. looks abit like Z208 ( or B ?) .. possibly a small p on the end ?

Any clues ?


thanks
Chris

According to the schematic, ZD101 is a 1/2 watt 20 volt zener. Something like the 1N5250B should be suitable.

PlainBill

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

i' ve found one 4748 diode here at home , would seem its a 22v though??

any good ? or i'm off to do a wee bit more shopping??

( never had this problem with parts when i was working )

C.

[PlainBill]

Re: Old git need help Goodmans LCD TV dead ..

i' ve found one 4748 diode here at home , would seem its a 22v though??

any good ? or i'm off to do a wee bit more shopping??

( never had this problem with parts when i was working )

C.

I'd suggest doing a little research. That zener is associated with the power FET in the SMPS. Off the top of my head, 22V is awfully close to 20V and 20V is a real handy number to pull out of the air. But the consequences of being wrong are pretty severe - lots of smoke and a smell of charred plastic.

PlainBill

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

Any easy way to test the Mosfet while I'm waiting for bits .
Only got an old fluke 77.


C.

[retiredcaps]

Re: Old git need help Goodmans LCD TV dead ..

Any easy way to test the Mosfet while I'm waiting for bits .
Only got an old fluke 77.

For testing mosfets, I like to test for shorts. Measure the resistance between Gate-Source, Gate-Drain, and Drain-Source. Any reading under 30 ohms suggests it is shorted. If you are testing "in circuit", then remove the component and retest "out of circuit".

Others test mosfets like this ...

http://www.4qdtec.com/mostest.html

PS. I have an old Fluke 75 (purchased used).

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

Test off board the resistance between
Gate-Source = NC
Gate-Drain = 2.4 ohm
Drain-Source = NC

Just getting a IRF840 ( seems a reasonable equiv ?) to replace it

thanks

chris

[PlainBill]

Re: Old git need help Goodmans LCD TV dead ..

Test off board the resistance between
Gate-Source = NC
Gate-Drain = 2.4 ohm
Drain-Source = NC

Just getting a IRF840 ( seems a reasonable equiv ?) to replace it

thanks

chris

Yes.

PlainBill

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

New mosFet new 20v zeners , new NCP 1200 , new fuse powered up .. flash-pop !!
Fuse gone. ?

Actually found another board on German Fleabay, but he won't send to me . I i've asked)

Chris

[Scenic]

Re: Old git need help Goodmans LCD TV dead ..

Actually found another board on German Fleabay, but he won't send to me . I i've asked)
Chris

If you really need it that badly, i could buy it and send it over to you if you pay for it + shipping.

I hate when you find the exact spare part you need, but the seller refuses to send it anywhere other than the country he lives in
Happened to me quite a few times already..

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

If you really need it that badly, i could buy it and send it over to you if you pay for it + shipping.

I hate when you find the exact spare part you need, but the seller refuses to send it anywhere other than the country he lives in
Happened to me quite a few times already..

Wow, that would be great ... would save me having to grow some more hair, just to pull out in frustration ?

the flea bay link is : http://www.ebay.de/itm/ws/eBayISAPI.dll?ViewItem&item=290583257669&ssPageName=ADME:X:AAQE:1123


thanks

Chris

[Scenic]

Re: Old git need help Goodmans LCD TV dead ..

19.90eur + 5eur shipping.
cheapest shipping option to the UK (?) is DHL w/o tracking (8.90eur).

so that would end up as roughly 34eur/46usd/30gbp total.

If you have paypal, that would be the easiest option. I would want the money beforehand though, as i don't want to spend ~25eur on a PSU board I don't need because you decide to fix your own one in the end (had something like this happen before.. that's what you get for trying to help sometimes..)

I'd say further details via PM?

edit: looking through that guys shop, it's kinda suprising this inverter/PSU board is as cheap as it is (especially considering it's supposedly new and unused). The other prices in his shop are pretty ridiculous, like 55eur for a 7" portable DVD player display, a 15" laptop LCD for 100 or a LCD inverter for 70eur

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

Great thanks, i'll hold off for a couple of days til next week.
Just had to spend a lump on my car service/MOT .

Also will give me a short while to have one last go at finding out the problem on this PSU is ..

Speak soon thanks

Chris

PS any clue anyone ?

[ceedy]

Re: Old git need help Goodmans LCD TV dead ..

off work today, so having another go..

R104 0.42 ohms is OC... not sure if I missed this first time .. or it was the last POP/flash?. redface:

Tricky size , might have parallel up to get close ? got lots but nothing this low..

LF104 coils = 1 ohm off board



C.