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While assembling a large printed circuit boards, one aspect to invest in is a wave soldering machine. As the process requires the soldering of multiple PCBs at once, using a wave soldering machine is a good decision to improve time keeping and reliability.
Indian market has seen a definite upswing in the demand for wave soldering machines. This is because the trend of soldering processes has caught on in the industry and the high demand is met with an enthusiastic supply at very affordable prices.
Benefits of Using a Wave Soldering Machine are Listed below
It is time friendly and allows for the soldering of multiple PCBs effectively during the assembly process.
It is more productive in terms of soldering quantity as it covers multiple joints at once.
It improves accuracy in the soldering process as temperature can be easily regulated to maintain a healthy flow of the solder.
It is easily accessible as the Indian market offers very reasonable prices and quick delivery for any soldering products that need to be purchased.
Finally, industries using wave soldering units have a competitive advantage both in terms of accuracy as well as productivity in terms of quantity and quality through the soldering process, if a wave soldering machine is used.
Sounds like either a loose connection suspected from the fault worsening when you moved it, or a dry solder joint on one of the pcbs. It could also be a dry capacitor on the power supply board shown by bulging tops on the capacitor. It could be that when mounted on the wall, the tv was located near a source of heat and this heat helped the low value capacitors to warm up and work. Either way it will be one of these 3 possible solutions.
Check the power supply area for bad connections especially near the large capacitors. If one or more of those are disconnected, the DC voltage will have some noisy AC on it that will sound like a buzz.
try unplugging the circuit board thats connected to the green picture tube thats the board in the middle then while the boards unplugged try to power up the tv if it works it means your green picture tube is shorted
Cold solder is normally fix with re-application of heat using a soldering iron. This is a fairly straight forward job and should not be that difficult. Probably what would take more time is opening the back cover and exposing the solder side of the PCB. Most TV PCBs are slide in/out (it may held in place by screws or retaining clips or side locks. Additionally, some of the wires/connectors may restrict movement and therefore must be disconnected temporarily).