I have a mitsubishi ws55807. I can turn it on and I can hear the high voltage crackle and the tubes filaments are lit, but that is all I get. No sound or video. All the power supply voltages are ok. What could it be
YES. The fluid may have damaged the traces on the boards. This isn't an easy fix. Look for the traces that are open are repair them. Scrape off the paint on traces, it will be easier to locate, also check the connector, between the two boards, for fluid.
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Re: Mitsubishi tries to come on
Good day, widgemix2003;
I'm sorry, but when you said all voltages where correct, I assumed you was a tech or person with some TV knowledge.
Okay, let's start over:
1. To reset the TV unplug tha ac cord from the wall for 3-4 minutes.... plug back into wall.
2. On the front the TV behind the speaker grill there is a flat panel... remove.... you will a small black screen/focus block. On that item you will see the words screen , turn one of those slowy to the right. What do see on the TV's screen?
3. Since you have access to front look closely for fluid on the PCB. Look on the right and center of the board closely.
Good luck, big IRISH. Or call me on cell @ 281-380-4422.
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If it has a picture tube first look with set on, three tiny filaments will be lit if good, not real bright as 6.3 volts ac voltage across two pins on the actual tube.
If you can see them lit they are ok---most sets mark them on the board at the end of the neck for the picture tube with H for heater.
Very carefully as high voltages on the board measure for 6.3 volts AC across those pins. If for example its 3 volts that is too low and the voltage from those pins can be physically traced back to the High voltage transformer creates it off two pins.
less than 12 connections between source and the board on the tube, if missing voltage at the tube follow it back--a single cracked or bad solder connection can cause this.
Its a older set, if you are able to open safely and run set JUST look to see if the faint filaments in the neck of the picture tube are lit, 6.3 volt filaments, and if they are not somewhere between source at High voltage transformer up to the PC board and socket at end of tube neck you have either a broken/bad solder connection or a open part--only about a dozen connections/parts between the two----set will have a ground and a voltage source at both ends of this chain, a bad solder connection will do this if filaments not lit(3 of them in neck of tube).
I think it is safe to say that your lamp needs to be replace. The crackling that you here by the lamp is the Ballast striking, trying to turn the lamp on. It will try 3 or 4 times and then quit. Your Color Wheel is the other sound that you are hearing and is normal as well.
WE can presume if static electricity on screen you have high voltage (most sets will not have sound if no high voltage).
If voltages appear to get good:
TAKE A CLOSE LOOK IN THE NECK OF THE PICTURE TUBE: all these sets the filaments in the tube should be lit when the set is on.
All are 6.3 volts AC (two filament pins on crt board--one is the ground and the other the AC--use that ground and carefully.
If no filaments or very very dim (they will be hard to see) the source for the voltage (if no or low filaments) comes from the high voltage transformer to the crt----usually one of two issues in this case---a part has opened or gone way up in value (resistor?)
It is a very simple circuit---just follow it back as usually on board that plugs to crt you will see something like H1 and H2. Follow both back and look for a broken connection or an open part between the tube and the source.
Let me know what you find and ask if more questions.
Yes you have no High Voltage, and you have filaments if you look at CRT's and they are dimmly lit on neck of tube.:::::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 2-1. At power on check for 12-volts DC at connector KH pin 8, if missing check IC9C51 part # 270P990010 and L9C52 part # 441D009020 on the Signal PCB
If, in a dark room you can't even see the screen lit up, you have probably lost your high voltage driving the picture tubes and if the set is over 10 years old, I'm pretty certain that the parts will be no longer available -- that is one of my pet peeves about Mitsubishi. If you can see a grayish screen, then maybe there's a chance it could be repaired by a competent and dedicated technican.