Question about Koss KS3102 System

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Components value I need the component value for R515B on the power supply board. I've looked for the schematic for this and haven't found it anywhere. The original problem with this unit was the power supply standby light was lit, but it wouldn't do anything. In the process of trouble shooting I shorted across the legs of Q501. Now I'm trying to put the smoke back in. Any help would be greatly appreciated. Thanks in advance

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This Component is red-red-black = 22ohms. Its of the same value as the R515A.

Posted on Aug 20, 2007

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Posted on Jan 02, 2017

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Our new Vizio DTV turns itself off after 20 minutes. We've tried all the solutions listed for 32


Hello
check its power supply regulator board for any loose soldering points. Take it out, and inspect all the soldering points. It is a commom fault to all TV sets' power supply baord, that some solder points may get loosed. Most of the components on power regulator board will heat up while sorking. Repeated heating and colling may make solder terminals of the heating components to get loose contacted.
Resolder all the suspected solder points by applying a little more solder without make any solder bridge short in between adjecent solder terminals. If this do not help you, replace the board as card basis.
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Here's a hints on how to repair or fix Nokia 5800 XpressMusic Digi Mic Knopfler problem issues.
A guide picture below which I included an schematic diagram shows each every components and line paths for quick test and check up procedures.
Digi Mic Knopfler Pin configuration:
1. L/R - microphone's left and right audio signals groundings
2. CLK - Audio Clock data
3. Data - Digital Microphone data
4. VDD - Power supply voltage

http://2.bp.blogspot.com/_8JZhVVmpICU/TBnMEY2FYyI/AAAAAAAAAiI/KWb0ERKLIPE/s400/digi+mic+knopfler+schematic.jpg


Locate and trace each and every components, line paths and corresponding connection as shown on a picture. The red highlighted components and line paths is for the power supply voltage which came from Power management IC (AVILMAS) Vsim2- approximately 2-3 volts.
Test and check this components and track the supply voltage from C220 to C2170 then through the digi mic knopfler pin 4.

http://4.bp.blogspot.com/_8JZhVVmpICU/TBnNuXjiK5I/AAAAAAAAAiM/zRyjq5oSGEA/s400/nokia+5800+xpressmusic+digi+mic+knopfler.jpg

The pink highlighted components and line paths is for Audio Clock data signal, which is came from the Audio Codec IC (Avilmas) then flow across R2201 and R2170 (valued 100ohms each) then to the Digi mic knopfler pin number 2. Check also the C2173 valued 22p Clock filter capacitor for possible damaged.
I included step by step procedures on the images like as follows:
* Check each components and line paths.
* Replace if found open or shorted
* Jumper the line paths if found open or cut
* Check or replace the digi mic knopfler for a quickest step might as possible.

http://4.bp.blogspot.com/_8JZhVVmpICU/TBnUknz7xAI/AAAAAAAAAiQ/McXux--YsDc/s320/nokia+5800+xpressmusic+digi+mic+knopfler+repair+gu ides.jpg

The microphone's digital data signals has also a line paths connected to the front side of the Printed circuit board, check and trace also this line paths which is connected to digi mic knopfler's pin 4

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3 Answers

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Its been a while since i worked on that power board. But I believe you are refering to the orange diode that runs into the single connector for the video board next to the power supply. I replaced mine with a 1n914 diode after replacing the 2200uf lytic cap and the tv fired right up.
ef1e2bf.jpg

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1 Answer

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It does in fact appear to be a thermistor and the TH1 board marking seems to confirm that.
What markings are on the component (it appears to be a power transistor of some kind) adjacent to it?

If we can find a standard part number for it and you own some kind of meter, perhaps we can either eliminate or identify it as the original culprit.

The failed thermistor is either acting as a temperature sensitive clamp to prevent lamp failure or regulates lamp intensity dependent on temperature.

Maybe an email to NEC would get you the value of it (TH1) since I suspect a schematic or parts list will be hard to acquire.

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23a68dd.jpg

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Hi,
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