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Monitor Audio Mass W200 blinking red led

jingaboys

Standard Member
Hey all,
My monitor audio mass w200 started acting up last week and does not work anymore. The red led blinks when turned on and nothing works.
bad timing for this to go wrong with the covid lockdown and stuff, any chance if this is repairable?
 
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Gasp3621

Well-known Member
Known issue as there is many threads about the flashing red light here at AVF and AVSF. It could be repaired possibly, but what is the cost for such job then if you can´t do it yourself. You aren´t limited to speaker manufacturer models if you want to buy new one with warranty.

Ask around how much the repair costs before pulling plug. @dobrykamil can probably give some idea of cost.

 

dobrykamil

Active Member
The problem is with standby power supply circuit.I’ve fixed that issue dozen of times.
 

jingaboys

Standard Member
Thanks @dobrykamil, I am an electronics novice but can try to give it a shot by ordering a micrometer and soldering kit from amazon and those parts mentioned in the thread. How do I identify those in the board? Sorry if I’m asking a noob question.
 

dobrykamil

Active Member
Take a look at this thread, and first replace capacitors and check diodes marked with yellow and red colour.
 

jingaboys

Standard Member
@dobrykamil Thanks! Replaced the said diodes and capacitors and the sub is back to working!! (I learned how to solder and almost burned the board, phew)

A related question, my sub's auto-on function has not been working for a while (it stopped working suddenly) and I've been running it in always on mode ever since. Looks like it still doesn't work after the fix. Do you know if there's a simple fix of components in the board for that issue?
 

dobrykamil

Active Member
I've had Mass200/Radius 380 (same amp board) with this issue in the past, and when I hooked it to the different AC socked it the same room, both subs started to work normally.
Take you sub to another room, and connect mains cable only. Set it to Auto and switch it on. Then, set to ON and after 5-10 seconds back to Auto and let me know if the light on the top turn red after 15-20 minutes.
 

Nevilinio

Novice Member
@dobrykamil Thanks! Replaced the said diodes and capacitors and the sub is back to working!! (I learned how to solder and almost burned the board, phew)

A related question, my sub's auto-on function has not been working for a while (it stopped working suddenly) and I've been running it in always on mode ever since. Looks like it still doesn't work after the fix. Do you know if there's a simple fix of components in the board for that issue?
Hi Jingaboys, I have the same sub which has developed the same symptoms. If you don’t mind could you tell me what did you replace and where did you buy them from? I’ve got plenty of time on my hands now so hoping I can fix it. 🙏 Thanks Nev
 

jingaboys

Standard Member
Hi Jingaboys, I have the same sub which has developed the same symptoms. If you don’t mind could you tell me what did you replace and where did you buy them from? I’ve got plenty of time on my hands now so hoping I can fix it. 🙏 Thanks Nev
I replaced the 3 diodes and 3 capacitors mentioned in this post: Monitor Audio W200 subwoofer MAS
The part numbers are in the post too. iirc I ordered the parts online from Cricklewood and Rapidonline websites.
Best of luck and let us know how it goes.
 

jingaboys

Standard Member
I've had Mass200/Radius 380 (same amp board) with this issue in the past, and when I hooked it to the different AC socked it the same room, both subs started to work normally.
Take you sub to another room, and connect mains cable only. Set it to Auto and switch it on. Then, set to ON and after 5-10 seconds back to Auto and let me know if the light on the top turn red after 15-20 minutes.
Thanks for your reply @dobrykamil. Tried what you suggested, and the unit has no issues going to standby from ON but it has trouble coming back to ON from standby. fwiw once it gets in that 'stuck in standby' state in the AUTO mode, I have to pull the plug out and wait for 5 seconds for the red light to turn off.
The ALWAYS ON mode works fine and I've been using that. Hopefully it doesn't draw a lot of power when not in use.
 

Nevilinio

Novice Member
That resistor looks in better shape than mine is. Have you tested what resistance you’re getting across it? Should be 51ohms. I think the black blobs are just the (originally brown yellow) securing glue that has got hot. Maybe somebody else can confirm that?

In my case I replaced some capacitors and one diode to fix it. Have you checked that they’re ok?
 

Nevilinio

Novice Member
I’ve only ordered from rs components. I ordered a bigger resistor and it’s yet to arrive as it was out of stock. It was as follows.
WIREWOUND;RES 51 OHMS;10W; 5%;AXIAL
Stock no.:8443705

It may be that your resistor is fine and it’s not that.... I was advised previously when I had my issue to check the diodes and capacitors marked on your picture below.
 

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