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Davy:
I need a Toshiba main board for Toshiba 40BL702B, 17MB65S-3 main board.

The board is marked, 17MB65S-3.....23030449.  I understand this number is the firmware version.  I can get a board 23030450 - would it work? They seem to use this board in many other brands as well, Tesco Wonder Telly I guess.

Looks like the audio chipped is duff, the four 15nF caps are OK, sound at headphones but not LS, got the headphone switching voltage and the voltages are up on the chip.

If I understand right, I should get 12V between speakers and ground as one video showed, I only get 1.4V.... wonder if the chip overheated and 'kaputted' the output pair, tried pressing the chip in case of bad connections.

Dave

 

Turnip:
Hi Davy,

Guess it depends on which screen fitted. Had a look on Ebay but both current sellers don't mention the screen but mention it might work, maybe. Gather they can't be arsed to check.

Had one in where the top edge Leds had melted the diffusers and I forgot to re-assemble the other way up so they might melt the other end - Nice pictures though. Loaned it to a chap with a 50 inch Pana plasma with download issues, he thought it great, if a bit small.

Met the 15nf cap biz several times. Gather they might check OK, but replace them anyway - Chris.

downunder:

Hi Dave,

Unless it has a weird design, there should be no DC on speakers as far as I know. It's a recipe for burning out voice coils. Suspect the audio output chip
is duff, letting DC through to the speakers.

Bruce

Turnip:
Hi Bruce,

Have a set myself where the speakers are DC above ground. Not an issue unless you ground the speakers. Guess something to do with bridge output - Chris.

Davy:
Saw a video where it said 12V I think it was between speaker and ground, there's no DC blocker in sight for the speakers and a single supply is used on the NTP8030, speakers are not grounded anyway.... all I can muster is 1.4V.

I'm waiting for a supply of SMD caps, could be breaking down under voltage as Chris said... odd both channels should suffer.

I don't know what the sound is like, might be better get a sound bar and use that, bet it sounds like listening to HI-FI on a pair of them Hi z 'brain clamps with a coil and a diaphragm made from a soup can, Sargent Browns where they?

Must get set up for BGA work.

Dave

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