Tdsystems K40dlt3f Panel V400HJ6-PE1 REV C2 short circuit no image

[Raulnn]

good evening. I have put the panel model, because it is a generic Chinese tv. The symptoms are the following: The rear light turns on, but there is no image, 12v arrives at the tcon integrated in the panel. I have made measurements of vgl, vgh and vaa. They are not present but they all act as rectifiers except for vaa, which is shorted. my questions are. Do you know any quick method to know the capacitor that is shorted without having a laboratory source? How could I know the value of the capacitor once extracted? I can't find schematics for this panel. a greeting

[Raulnn]

Re: Tdsystems K40dlt3f Panel V400HJ6-PE1 REV C2 short circuit no image

Someone?

[nomoresonys]

Re: Tdsystems K40dlt3f Panel V400HJ6-PE1 REV C2 short circuit no image

test them with multimeter for shorts or very low ohms, just put a probe on each end of capacitor, if you have a meter that beeps in continuity mode and you get a steady beep its shorted, meter not the type that beeps no worries, if its very close to 000 its shorted, one bad cap can make the rest read short also.

[Raulnn]

Re: Tdsystems K40dlt3f Panel V400HJ6-PE1 REV C2 short circuit no image

test them with multimeter for shorts or very low ohms, just put a probe on each end of capacitor, if you have a meter that beeps in continuity mode and you get a steady beep its shorted, meter not the type that beeps no worries, if its very close to 000 its shorted, one bad cap can make the rest read short also.

Thank you very much for answering. I already did that, the problem is that there are several short-circuits in the Vaa area. but I don't know which of them will be shorted without removing them from the board. with the circuit shorted, many capacitors beep. I do not know if it is possible to know in any way which of them it can be, without disassembling and without an external source to inject voltage. Thanks in advance

[nomoresonys]

Re: Tdsystems K40dlt3f Panel V400HJ6-PE1 REV C2 short circuit no image

something like this may help you find the shorted component: https://www.amazon.com/milliohm-mete...c7q6%2FkMXU3oQ

[nomoresonys]

Re: Tdsystems K40dlt3f Panel V400HJ6-PE1 REV C2 short circuit no image

there's other methods too, involving feeling for hot ones, voltage injection, infrared cameras, iso alcohol, candle wax etc, can check youtube, some say it's an obsolete method but I usually start at the end and remove one at a time til I find the shorted cap, they aren't that hard to replace with a little practice.