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No sound changed output ic stk 402-090 still no sound

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2 Answers

I need Original Sansui CR-M7 Cassette Receiver stk aideo ic


Just order the stk????? part number printed on the IC from a supplier. Try typing it into Google, there will be loads of suppliers offering the sale.
Hope that helps.

Feb 19, 2011 | Computers & Internet

1 Answer

Aline blue grosshire


This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

Nov 24, 2009 | Toshiba 50H72 50" Rear Projection...

1 Answer

The three colors on our set no longer converge. When we do the "flash focus" it goes through the routine but nothing is changed afterward. If we try to do manual convergence nothing moves or changes.


This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

Oct 23, 2009 | Sony KP-46WT510 46" Rear Projection HDTV

1 Answer

I am getting red ghosting, and can't adjust it. Can you tell me what might be wrong?


This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$400

Oct 03, 2009 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

What is STK ICs?


STK-series integrated circuits are amplifier IC's that are most often used in projection TV sets as convergence output amplifiers. When these or other convergence parts fail, the three color images no longer line up correctly on the screen.

Jun 17, 2009 | Panasonic PT-56WXF95 56" Rear Projection...

1 Answer

Set dead


That code always be for audio amplifier IC damaged.Change it

Jul 09, 2008 | Panasonic Home Theater System System

1 Answer

Set dead


Replace output ICs

Jul 09, 2008 | Audio Players & Recorders

1 Answer

Tv wont turn on


1024x768 Normal 0 Won’t start

The power supply has an automatic shutdown circuit that senses a shorted component and excessive current flow.

If you can access the convergence board and remove the plugs one at a time (red, blue or green) for the convergence output, the TV may start up and show a picture with the unplugged color misaligned.

This confirms a short in the convergence output. The convergence IC failure can show up as coloured outlines or power supply shutdown.

If this does not help, then there is some other short circuit in power or deflection circuits. You need a technician to troubleshoot HV or power problems.

Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and no more color outlines or power shutdown.

This is the most common fault in all makes of rear projection TVs.

Some models of TV require major disassembly and considerable shop/manufacturer's support to repair because of their design that causes other power supply or vertical deflection problems. The poorly designed products require a "bench" repair that can typically cost from $350 t0 $700.

Some TVs are designed for on-site repair and have more reliable circuit design that does not usually cause damage to other parts of the TV when convergence chips fail. The ones that usually allow reliable on-site repair are JVC, Samsung and Hitachi.

It is normal to have some resistors in the circuit burn up or increase in value from the heat (from 2.2 ohms to 5 or 10 ohms). These resistors must be replaced with the right value or the chip will fail again.

This is not a simple repair like changing batteries or a fuse. Reading through the other posts shows many that try and end up with bigger problems.

Your JVC uses STK 392-110 IC's. Misinformed people replace the IC's with other "new and improved" IC's, like STK 392-150. These are devices with different characteristics and require different value resistors in the circuit. Replacing with the STK 392-150 will cause overheating of the resistors and a damaged IC.

If you are in Calgary, I can help. If not, get someone that has experience working on your JVC. My website is below with some costs and explanation.

calgaryconvergencerepair.weebly.com/convergence-explanation.html

Good Luck,

Easyab



Jun 26, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Hitachi 65xwx20b convergence


Your message says you "replaced stk392-150", did you replace both of the stk`s or just one of them??? One is for RGB vertical the other is for RGB horizontal, you should always replace both stk`s as a set, Hitachi recommends you use a "replacement kit"
part number X480306", this kit includes both stk`s with a new & supposedly improved set of stk`s as well as all resistors that are required for proper set-up, they strongly recommend you change all of the parts in their kit. The only other thing besides IC`s & resistors that could cause your problem is:
1) bad dcu output (you need a scope to check this)
2) you`ve lost either the +15 volt line or the -15 volt line to the IC`s, "Fxxx" chemical fuse open in power supply.

Dec 01, 2007 | Televison & Video

1 Answer

No sound or picture


I always look for back stk Ic's in these. not the outputs but in the output driver stage. copare voltages with the other stk's . Does one of them have higher voltages? Like instead of 1.3 volts it has 4 or 5volts? if so it's bad. you can find these Ic's on ebay , I did. also upc2581 driver ic's can do this. Larry

Aug 31, 2007 | Sony TA-E9000ES Amplifier

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