My 5 year old Mitsubishi WS-55819 projection TV has a power problem. When I press the power button it turns on for about 2 seconds and then turns itself off. The picture doesn't come onto the screen as the power cuts off so quickly. I opened the back and there is a small black diode type thing (possibly a relay) on the middle PC board towards the back that clicks when it turns on and off. Someone suggested a leak from the 3 bulbs could be a cause but I cannot see any leaking substances anywhere. Does anyone have a suggestion to figure out what's wrong? I don't have electrical test equipment for troubleshooting. Thank you...
This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times. 1 - 2 = no error detected 2 - 1 = X-ray protect (high voltage or beam current) 2 - 2 = Short protect (short protect monitors low voltage supplies) 2 - 3 = Deflection protect (this could be loss of vertical or horizontal deflection) 2 - 4 = Vertical protect (usually loss of vertical from the source) 1. SHUTDOWN AT POWER WITH SELF DIAGNOSIS ERROR 2 2. CHECK FOR LEAKY C9A60 470 PF 1000 V PART # 154P400030, PARALLEL TO D9A57 ON THE POWER PCB (NOT SHOWN IN THE SCHEMATIC). 2. SHUTDOWN AT POWER WITH SELF DIAGNOSIS ERROR 2 2. CHECK FOR OPEN FUSES F9A04 AND F9A05 PART # 283P043090 ON THE +24 AND -24 VOLT LINES. IF THE FUSES ARE OPEN THE CONVERGENCE OUTPUT CIRCUIT WOULD BE SUSPECT. 3. SELF-DIAGNOSIS INDICATES SHORT PROTECT. CHECK FOR A SHORTED IC4B01 PART # 270P261020 (VERTICAL OUTPUT) LOADING 24-VOLT SUPPLY LINE. LOCATED ON THE MAIN PCB
I am a technician and I had a shutdown problem on a WS55819 it would try to come on and shut down right away and could not hear the static sound of high voltage being generated. After checking the circuitry found I had all normal dc voltages before shut down. I disconnected each one of the CRTS from the high voltage divider for the crt anode voltage. Found out after removing the green anode lead from the divider the tv came on, problem was the green tube, was pulling down the divder block output voltage wich should be 30,000 volts approx. Be careful when working in this circuit you can get shocked easily.
SOURCE: mitsubishi ws-55819 power problem
Hello DaveDaveDave, Ok let's levelset as is said in the business world today. it looks like you have an overcurrent protection problem which means that the tv set has a component that is causing excessive current to be drawn. Now this can be caused by a component withc has become "leaky" (by leaky this means the inability to prevent the flow of electrons as related to dc voltage). Your last statement is the reason I am replying how I am. Since you don't have equipment your only option is to take this set to a TV repair shop and have it repaired. I have given you a possible cause a component in the HV section that may have gone bad, but without substantial data as to the voltage levels and signal appearances, one can only guess. I hope this helps and you find what you are looking for. Thank you, Shuttle83
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I had the 2-2 diagnostic blinks and it was found the IC's on the middle board behind the large heatsink were shot. Thank you for your assistance...
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Please help
can someone email the service manual to me [email protected], my problem is pretty much the same power issue, I turn the unit on it click off I changed the IC although there was nothing visually wrong with them same issue. I was told it is possible the power supply chip but I'm not sure which one it is so, if someone can point me in the right direction that would be appreciated..
I think it's possible the STR F6628 but I'm not sure. how do you check it with a volt meter? thanks for the help
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