Dear Members,
I have Velodyne 10, it's on and responding to low frequency,
but the speaker is not vibrating properly,
Is it possible that the speaker is faulty or the amplifier ?
The speaker resistance is 7.8 Ohm when I put on meter, but I'm not sure it's ok.
Because it was getting a surge before,
I've fixed the bridge, switching FET and FET driver before, and also
the amplifier chip and FET are replaced,
Is it possible the speaker was burned as well, even it's 8 ohm, it's faulty ?
Thanks
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Sound of relay ?
Dear Members,
I got sound of relay of my woofer, but the speaker is not moving,
I tested the speaker is ok, 8 ohm.
It's Velodyne 10EQ Max.
What do I reckon I missed here ?
Thanks
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Samsung SynMaster2443 Faulty display ?
Dear Members,
What's the faulty of this display ?
Any ideas fixing it ?
Please see my attachment,
Thanks...
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Re: Samsung SyncMaster740N ?
Where can I see " if both tubes are lighting up when it starts"
May be I need to replace the tube, because it was flickering before it blank out.
Is the tube for this model easy to find ?
Thanks...
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Samsung SyncMaster740N ?
Dear Members,
I have Samsung SyncMaster740N ,
I replaced 12V and 5V rail capacitors about 5 years ago,
now the symptom is,
it turns on few seconds, then black screen but power still on,
what could be the cause ?
ThanksLast edited by bianchi77; 01-13-2021, 05:30 PM.
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WDC hard drive ?
Dear Member,
I've found SMD diode with code 5463 on WDC Hard drive,
Is it compatible with TVS diode ?
Thanks
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Intermittent WDC Harddrive ?
Dear Member,
My WDC 250Gb Harddrive, sometimes can not be detected by BIOS ?
What's the issue with it ?
Can it be a power supply issue ? I'm using 430W with double VGA
2xSSD 2x HDD
65W CPU
Thanks
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Re: Velodyne switching PSU ?
Do you have the same problem ?
Any photos ?
thanks...
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Re: Manson NP-9613
I changed Q4, could it be Q5 is not working as well ? thanks...
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Re: Manson NP-9613
Let me check the voltage across C2 and see......
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Re: Manson NP-9613
AVO = Ampere Volt Ohm....it's the meter, I used to call it AVO
Yes it does measures AC voltage out of the transformer.....
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Re: Manson NP-9613
Which test hadn't I done ? yes, it's working from 0 to 19V..
I tested to maximum, it can show until 30V on the output but not stable and going down...
Thanks for helping, take it easy R_J.......
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Re: Manson NP-9613
There is a connector from the transformer, I opened it, I want to check the condition of the transformer,
4 pins on it, I put one as reference (0) and the other for checking the secondary voltage output, from the result, the transformer is ok .
I checked it with AC voltage on my AVO.
I'm not sure if the relay is good or not, or may be one of the 3 transistors is not good 2x 2N3055 and 1 x TIP 31, I have replaced one of 2N3055 since I checked the hfe of it, it's low. but it doesn't help yet....
...
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Re: Manson NP-9613
is it possible that 4700uF caps going bad ? making the output drop ?...
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Re: Manson NP-9613
I got
13V 23V and 33V on the transformer voltage......
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Re: Manson NP-9613
It could have been the transformer, since I rotated until 20V and no more voltage increasing on the point you gave me, and the pot was maximum...
if the transformer winding is opened....difficult.....
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Re: Manson NP-9613
Ok, let me check and get back to you, thanks...
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Re: Manson NP-9613
I got 12.41V and 5.6V on the zener, so could it be the issue with relays ?...
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Re: Manson NP-9613
Ok, I will check,
I used common on the output, which ground should I use ? thanks...
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