Question about Mitsubishi WS-55809 55" Rear Projection Television

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I just replaced the 2 ic chips (stk392-570) and the 2 pico fuses at f9a04 and f9a05 that were blown. The tv powed up for about 10 seconds then turned off again. Now i'm getting the same 3 second power light and the 22 code again now the pico fuses are dead again. What else could be blowing them or should I use a 7 amp instead of the 5 amp. It's the WS 55809

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  • DeviousOne Jun 04, 2009

    would they be the ones to the front of the ic because i have no idea of how to check them and i'll just replace them all. Would you know where to get the diagram for this model.


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You have bias resistors close to the IC's, I would guess you have a few that have changed in value and therefore have destroyed the IC's again. Now you must start over again. The resistors will be very low Resistance and tolerance and they must check exact.

Posted on Jun 04, 2009

  • Jim Krause Jun 04, 2009


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How do i test fuses on a circuit board?

F9A04 and F9A05 are the two picos to test. They are both 5amp pico fuses they will appear lime green and look like resistors without color bands. They are located on the same board as the convergence Ics. Just test them for continuity with a ohms meter.

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Thats the 22 error for short protect shutdown. Thats usually due to the convergence ICs. You can verify that by checking the two pico fuses F9A04 and F9A05 if either of them are blown the convergence ICs have failed.

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Thats the code for short protect. Usually its the convergence which has blown F9A04 or F9A05 if either pico is blown the convergence IC and picos will need replacement

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1 Answer

My Mitsubishi WS-65809 displays a 2 blink pause 2 blink sequence when the menu and input buttons are pressed and held at the same time. What does that indicate?

tHats indicating a short. Check the two green pico fuses F9A04 and F9A05 on the center board if they are blown replace the two 5 amp picos and the convergence Ics.

Jun 10, 2009 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Mitsubishi WS-55819 Won't turn on

If F9A04 and F9A05 are open the convergence ICs will need to be replaced as well as the two pico fuses. You will need two STK392-570 Convergence ICs and two 5 amp pico fuses. You ca get the replacement parts at the following link with free installation instructions. heres thelink.

Jan 22, 2009 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

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Check pico fuses F9A04 and F9A05 if either one of those picos are open it means the convergence Ics are bad along with the picos. Your set uses two STK392-570 ICs and the two picos are both 5amp picos. You can get replacement parts and installation instructions at the following link.
The pico fuses are located on the second board from the right heres a pic of where they are.b86c4db.jpg

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1 Answer

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look on the center board where the ics are and check F9A04 and F9A05 pico fuses, if they are blown you will need to replace those two 5 Amp picos and the convergence Ics

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1 Answer

My Mitsubishit 65511 projection tv won't turn on. Its approx 6 - 7 years old. I tried the system reset button, but that didn't work. I hit the menu and device buttons and got a code of 2 or 22. Can you...

Check the center circuit board for two bright green picos fuses numbers F9A04 and F9A05 if those are blown replace the convergence IC . The picos are 5amp and the IC is STK393-110 you can get replacement parts at the following link. and this is what the picos look like155d14d.jpg

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