Toshiba 32WLT66S - No power (completely dead)

[tom66]

Re: Toshiba 32WLT66S - No power (completely dead)

Tom can I jog your memory on this? I got one last night stuck in standby (it came on once) it came with a new str transistor for the psu which I fitted as it was there but still the same!

I ordered that ic you had problem with for a tenner, still steep, but how tiny is it? smaller than the samsung eprom, worried now about soldering it lol and if it will fix the problem, previous owner was using a hair drier in the back vents to get it out of standby!

thanks Ronnie

It's bloody tiny. To be honest I would suggest my mod as it is very difficult to replace. I think it's about 5mm x 5mm.

[netdent]

Re: Toshiba 32WLT66S - No power (completely dead)

It's bloody tiny. To be honest I would suggest my mod as it is very difficult to replace. I think it's about 5mm x 5mm.

Ok Tom will wait and see when it gets here lol

[netdent]

Re: Toshiba 32WLT66S - No power (completely dead)

Wow it was tiny but I done it! was shaking like a leaf lol but tv now working, nice result and worth the tenner I rekon

cheers Ronnie

[age9000]

Re: Toshiba 32WLT66S - No power (completely dead)

I know this is an old thread but think this is the same
and a lot cheaper

http://www.ebay.co.uk/itm/MP2105DJ-M...item2ec7a10b5c

have also seen some listed that are posted from china for £1.69 posted (pack of two)
some people over in china are selling in packs of 10 for about £4.33
need to search on ebay.com for these

Age

[stj]

Re: Toshiba 32WLT66S - No power (completely dead)

oh those. easy with hot air.

if audiofreak19 see's this post - that's why you have hot-air aswell as an iron!

[audiofreak19]

Re: Toshiba 32WLT66S - No power (completely dead)

Haha I just saw this thread. Thanks for the help. I'm anxious to get my hot air station it's a xytronic lf-852d. I'm trading my Dynex 32in lcd for it.

[tom66]

Re: Toshiba 32WLT66S - No power (completely dead)

I wouldn't use hot air for such a small IC. I'd take it off with a soldering iron. I only use hot air for QFNs and thermal-pad packages, or very large QFPs.

[stj]

Re: Toshiba 32WLT66S - No power (completely dead)

really?

i use air even to fit 0603 resistors
paint flux, place part,
lower the air - wait for the flow.
job done

[tom66]

Re: Toshiba 32WLT66S - No power (completely dead)

You can do that, but it takes far longer than actually soldering it by hand. I can have a row of 10x 0603s done in about a minute. You do need a steady hand though.

[stj]

Re: Toshiba 32WLT66S - No power (completely dead)

i wouldnt say MUCH longer.
your doing 6 seconds per part.
i recon it takes me 8-10 with air.

[tom66]

Re: Toshiba 32WLT66S - No power (completely dead)

The main problem I have with hot air is it's difficult to get it just right - avoid blowing off other parts for example. It might be my technique but I usually have to cover the board in kapton or tin foil to avoid damaging or removing other parts while trying to take one off.

As far as removing a SOT23 with 5 pins, it would take maybe a couple of seconds; just flood both ends with solder and it'll float on a nice river out of there...

[audiofreak19]

Re: Toshiba 32WLT66S - No power (completely dead)

But don't they have very small tips for removing the real small components. I would think it would make as15 chips easier to remove and to re solder easier.

[tom66]

Re: Toshiba 32WLT66S - No power (completely dead)

I use a tip about 4mm wide for taking off and putting on SMD chips, including AS15 and the BD9897FS inverter chips. Small tip doesn't really matter, in fact you want a reasonably sized tip to get good thermal transfer. You use wick to clean up any bridges (don't use the shitty radioshack stuff, you'll be there for ages - use something like Chemtronics SODER-WICK, or another good product.) A good soldering iron with high thermal capacity is also key, try to get a nice used Weller, Antex, Metcal, etc. rather than an Aoyue or other cheap stuff. The cheap stuff does have its uses and can work quite well, but you should upgrade as soon as you can.

Since hot air tends to be more damaging to a board, I really only use it when I'm taking off components with thermal pads, or components where you can't get to the leads directly (e.g. QFNs and BGAs, though never done a BGA yet.)

[audiofreak19]

Re: Toshiba 32WLT66S - No power (completely dead)

O ok. Yea I think I'm gonna pick this hot air unit up sice the tv I'm giving him I got free. But I might go for the weller I saw on Craigslist. It is digital and brand new with multiple tips. Depending on how much a hakko goes for.

[rustynailor]

Re: Toshiba 32WLT66S - No power (completely dead)

Hi Tom,

I found this post when I was looking for information on repairing my 32WLT66S - it's given me seven years of good service, but recently it's started only switching on intermittently - now it only turns on around one time out of twenty (after turning off and on at the mains), the rest of the time the lights don't come on at all. I'd like to repair it if possible, as when it does come on the picture is still fine, and it'd be real shame to send it to landfill.

My original plan was to replace the power board with a new one purchased from ebay, and then if that didn't work, the sub power board - but after reading your post, I'm not sure that's the best plan of attack.

I'm a software developer by trade, and I'm comfortable replacing boards and opening electrical appliances up, but not with soldering - although I am keen to learn. My goal is to never buy anything if it can be mended!

I appreciate I'm an irritating newbie with a limited skillset opening up an old thread, but any pointers you could give me would be much appreciated - if the fault is the same as the one you found, would replacing one of the boards inside the TV help? If so which one?

Cheers,

Russell

[tom66]

Re: Toshiba 32WLT66S - No power (completely dead)

No worries Russell. I do embedded software myself, but I also work in design engineering for electronics.

In your case, replacing the board with the two HDMI ports on it ought to work. It may be variably called the HDMI board, digital board, scaler board, main board or main A/V board. (However note that there is also a board with the analog video inputs on it such as SCART and component - this may also be called the main A/V board or the main board.)

[rustynailor]

Re: Toshiba 32WLT66S - No power (completely dead)

Thanks so much Tom - I'll pick one of those up, and hopefully it'll do the trick!

I code mostly web stuff (Laravel mainly), and a bit of Java for Android, but I'm really excited by home automation - some of the Arduino stuff out there is really interesting (and accessible), so I'm planning to do some experimenting later this year.

Anyway, thanks again!

[rustynailor]

Re: Toshiba 32WLT66S - No power (completely dead)

Hi Tom,

I just wanted to say thanks again - I picked up a replacement board on eBay and installed it, and the TV is now working like new.

Without your generous help, it would be on its way to the dump by now - your assistance was very much appreciated! Cheers, Russell

[tom66]

Re: Toshiba 32WLT66S - No power (completely dead)

Great to hear! Another TV saved from the dump.

[SgtRock]

Re: Toshiba 32WLT66S - No power (completely dead)

Dear Tom & Vince:
--Great sluthing, as usual.
Kudos!