Chances are the power supply is fine and you have shorted lamps in the panel
Testimonial: "I see what you mean. I used my Sperry, Cen-Tech and my trusty old analog GE just in case. I'm testing the LEDs right now anyways. Might as well check."
This is what's confusing to me. I tested the power lines going to main board, and both sockets test good. The led driver socket is zero. Wouldn't it be shooting up and down or at least showing some voltage? I've been searching for which components effect the led driver power and I can't find. I'd rather be able to check this section before digging into the led strips. Hisense really makes it difficult. I haven't had these problems repairing other tvs.
Unhook the lines going to the panel and connect a meter with a high low max min setting (like a fluke)and set it on high or max and you should see voltage if you test it this way, a regular meter may not see the spike as it only lasts a fraction of a second, if you don't see anything at all then yes I would be looking at the power board...I replace one power supply with no backlights for every 15 to 20 sets I change the lamps on
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SOURCE: Sound but no picture. No backlight present. No VLED_VCC Voltage from PSU
For sure is the power supply can you replace the module?
SOURCE: power supply problem
Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
SOURCE: 47' (sic) LED TV, model number m470vse. Why doesn't the backlight work?
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.
SOURCE: On my Hisense 50K23DG LED TV, I have sound but no picture.
Hi,
Hisense TV's usually use PCB Boards by Vestel and not Hisense themselves, have a look at: Vestel Help If the Boards in your Hisense match this Board/Part Number format at least you'll know what to search for, replacing the power supply will not help unless the process has been incorporated into the power supply and that is not known for certain yet
Good Hunting
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
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