SONY KDLW40A12U NOISEY FAN

[kennyc]

Hi Guys ,have got a 40inch Sony that has a cooling fan in it that is making a noise . Have taken the fan out and cleaned the dust out of it but it still makes a noise . Simple I thought just disconnect fan . Nope, must be a protection circuit that detects the fan has stopped and turns the TV of after 30 seconds . Any ideas or do I just have to get a fan which is over £100 at CHS. Thanks

[Turnip]

Hi Kennyc,

Usually with a fan, just remove the disc covering the bearing and oil it -

Works a treat with most computers - Chris.

[downunder]

Hi Kenny,

If the fan uses 3 wires, one is a feedback to the microprocessor. Some TVs are rather particular about the fan that is used and will not accept generics.

Try what Chris suggests. I usually use a spray can of lubricant that has an an extension tube that fits into the nozzle. You'll find a gap between the fan blades and the motor section. Give it a good squirt into the gap and try it.

It'll sort a sluggish fan but may not fix a fan that is knocking. Short the yellow and black leads and see if the fan continues to operate without tripping the TV. If so, you may get away with a generic fan by doing the same to it. Protection will be gone though.

Bruce

[kennyc]

Thanks for your ideas. Will try to oil the motor . Dont want to start shorting the wires out in case the TV goes off totally and customer complains it was working before I started working on it. You know the usual story

[cheeky2]

If i recall i had one of these a while back someone had left a pencil stuck in the fan! I noticed that the fan was 12V with a yellow wire which sends the signal back to the mainboard. I would suggest if the oil doesn't sort it out try a PC fan which may do the job and substantially cheaper at around £10. If you have one of them around give it a whirl check the voltage coming out from the yellow wire and compare with a PC unit fan.
 Good Luck :)

[kennyc]

Hi Cheeky2 ,got a price of £124 from CHS so gave customer the E mail and left it up to him to buy one and I would fit it . Wasnt going to take a chance on buying it myself and being left with it if he changed his mind . So far nothing been heard from customer . Hes maybe just gone and bought a new TV .Thanks for your advice anyway

[downunder]

124 quid......wow, what a rip-off.

[kennyc]

Hi Downunder ,CHS seems to be the only place that has them . None on E- bay or any other site . Seems its a take it or leave it price

[Turnip]

Hi Kennyc,

Guess oil didn't do the biz - You didn't mention continuing problems - Curious, as wouldn't want to pay £124 for a simple fan, no matter whether two or three wire.

Guess CHS has to charge for stocking stuff no-one sensible cares to buy - Chris.

[kennyc]

Hi Turnip ,did oil it but dont know how long it will last . Like I said in earlier post thought I could just disconnect motor and job done. Maybe could have shorted 2 wires together to stop TV tripping with motor disconnected but didnt want to blow TV up myself 

[Turnip]

Hi Kennyc,

Know how you feel, it's rough when something dies on the bench or a week or two later - Handing back cash isn't fun at any time, especially as earning it takes quite a while in some cases.

As to fans generally, they're usually sleeve bearings for cheapness, and a squirt mostly does the biz for a couple of years at least, not had one back yet - Chris.

[downunder]

Hi Kenny,

I concur with Chris. Lubricant usually keeps them going for a few years, and I too have never had one back.
I certainly wouldn't pay that sort of dosh for a fan, and I'd say, nor would your punter.

As for shorting out the fan's feedback lead, I've done this with many Samsungs when replacing main boards on ones that don't use a fan, with main board that does. An error message appears - "Check Fan 2".
A link on the (absent) fan socket on the Main board sorts that out.

I'd personally take a punt on lubrication. Works for other applications as well.

Bruce

[Turnip]

Hi Bruce,

Talking lubrication and motors, have considerable problems with domestic dehydrators where sleeve bearings gum up rather quickly and motor comes to a halt - 'She who must be' gets a bit peeved.

Bit surprised as often the back bearing that sees no dust, is often the problem.

Realise, not a Sony, but wonder if it's in the nature of oil to gum, and if so maybe PTFE in some form might do the biz in all fans - Chris.

[sparky]

Hi give EMOS a ring or email him

[downunder]

Hi Chris,

You're probably correct about oil, especially heavier grades. Imagine they'd get a bit tacky, especially when you can't get the oil fired heater to work.

Not familiar with PTFE in the antipodes, but I use those cleaner/lubricant sprays like WD40....good old fish oil. Remember,  happy wife, happy life, or is it an urban myth.

Bruce