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.
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
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.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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).
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.
If you have an ohm meter, check the resistance from F9A04 to ground, and then reverse the leads and check F9A05 to ground. These supply +24 and -24 to the convergence integrated circuits. The conv ic's may be bad. Also, code 24 usually indicates vertical deflection failure as well. One other check to make.....The pic tubes on this set may leak a few drops of coolant onto the boards. Look VERY carefully for liquid drops on the boards or a green and or white corrosion spot or two on the boards under the pic tubes-near the front of the chassis.
This is a convergence rpoblem that is either bad connections on the pins of the convergence ICs or defective ICs. If you can solder and are comfortable working inside TVs where there are potentially dangerous high voltages, let me know and I'll provide additional details and instructions for fixing this yourself.
This sounds like a high voltage problem or a picture tube issue (burnt out filament). I would first determine if you had high voltage at the anode of the TV by using a high voltage probe. If you do not have high voltage then I would suspect the voltage doubler, the IHVT (Integrated High Voltage Transformer) or the Horizontal Output Transistor (I doubt this only because you don't have a power supply failure and I would expect this in a modern TV since the high voltage supply is tied to the low voltage supply), the more likely suspect is the voltage doubler. Second possibility I would check is the CRT socket board and CRT filament. Unplug the TV and with a multimeter set to read resistance check to see if the filament pins read a low resistance if so the filament is good. Plug the TV back in and turn it on and check the voltage on the CRT board and compare them to the schematic values. These two tests should localize the issue. Now, If you have a background in electronics, this should be no problem to do, however if you do not have a background in electronics, I would suggest that you have a qualified TV technician troubleshoot and repair this TV set.
ticking sound (like a Watch) coming from around the Flyback Transformer but I don't see a spark is called EHT voltage .
if eht voltage is ok
1 check filament is glowing or not if it is ok check voltages on crt.
2 if it is ok check luminance section in chroma section.
if filament is not glowing check for low eht due to hor section
check power supply output also.