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Equipment Repairs => LCD TV forum => Topic started by: Davy on June 30, 2018,14:41:23

Title: Toshiba 40BL702 No sound
Post by: Davy on June 30, 2018,14:41:23

Anyone had a Toshiba 40BL702 with no sound? This uses a Vestel 17MB65S-3 main board.

Sound at headphone socket OK but not from speakers, the headphone socket is providing the switching 2.5 'mute' voltage. The small pesky multi-layer smd snubber caps. appear to check OK.... and the 24V supply is OK for the NTP-8030 output chip.... anyone tried changing it? Yeah, I know it's soldered underneath for the heat sinking.

Dave

Title: Re: Toshiba 40BL702 No sound
Post by: jordan on June 30, 2018,15:10:30

Enter  service mode (pres MENU4725 buttons on RC) and restore factory defaults.

Title: Re: Toshiba 40BL702 No sound
Post by: Davy on June 30, 2018,16:42:37

Hi jordan, I've already tried that, I've just tried it again to be sure still no sound after a retune, when I get time I'll have another look around.

Don't know why I'm bothering, sound is usually rubbish anyway..... could always use a sound bar or external amp?

Thanks for trying jordan, Dave.

Title: Re: Toshiba 40BL702 No sound
Post by: michael first on July 01, 2018,18:31:39

Hi,the smd caps should be replaced;usually this cures the problem.

Title: Re: Toshiba 40BL702 No sound
Post by: Davy on July 01, 2018,19:47:06

I'll try replacing those multilayer, I know the ones you mean there's a string of em' on the output side, non of them are 'shorted'....  the output chip doesn't appear to be 'cooked' both sides as clean as a whistle.

Dave