Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Audio Equipment
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 10-12-2021, 09:48 AM   #1
jimbofz
Badcaps Veteran
 
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 281
Default roberts dab mpsound 43 circuit

Hi ive searched internet for cct diagram of sound o/p stage using TPA3100D2 ic.no luck

in manufacture they pour hot melt glue over the top to secure the inadequate heatsink .problem is it carbonises and when removing (carefully),to expose the pins of this 48 pin ic some of the very small surface mount components come off with the goo..
some sony tvs use this ic kdl3500 model .their cct leaves me puzzled as many external components are completely different .
the sound via headphones is fine as it uses separate 8 pin ic
theres sound going into the tpa chip and all supplies ok ,but not a peep of sound replacing this minature ic would be a chalenge as a number of close components would have to be removed to gain acess with solder station
has anyone done battle with one of these ?or any other brand that may use the same ic? roberts technical is a joke ,no help at all .the sound on these is very good when working ok ,so its worth my time trying to repair. thanks
jimbofz is online now   Reply With Quote
Old 10-12-2021, 10:14 AM   #2
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 25,513
Default Re: roberts dab mpsound 43 circuit

Quote:
Originally Posted by jimbofz View Post
Hi ive searched internet for cct diagram of sound o/p stage using TPA3100D2 ic.no luck
you dont get luck if you use the devil's search engine - you get targetted marketing.

if you use yandex you get this:
https://www.ti.com/product/TPA3100D2

although i already knew it was a Ti part because it started with "TPA"
stj is offline   Reply With Quote
Old 10-12-2021, 12:57 PM   #3
jimbofz
Badcaps Veteran
 
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 281
Angry Re: roberts dab mpsound 43 circuit

thanks STJ ,been using that info,
mute pin 45 low ok
vreg pin15 4v ok
shutdown pin 44 high ok
vbyp pin16 1.25v ok
avcc supply 10v ok
fault pin 46 low ok
pvccl 10v ok
pvccr 10v ok
i/p left and right healthy waveform ok
no measured s/c across o/p ,l/s both fine
so unless i can find out from cct diag the correct values of the surface mounts
im snookered
jimbofz is online now   Reply With Quote
Old 10-13-2021, 02:43 PM   #4
jimbofz
Badcaps Veteran
 
Join Date: Apr 2013
City & State: cheshire
My Country: uk
I'm a: Knowledge Seeker
Posts: 281
Default Re: roberts dab mpsound 43 circuit

the sangean ddr 43 , 62 , and 63, look the same product
any ideas for servics manual /cct diagram ?
thanks
jimbofz is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 12:16 PM.
Did you find this forum helpful?