Failed HV transformer on VIT7101 inverter (Beko TV)
Good day folks. I'm in the process of (hopefully) repairing this TV, so I thought I'd do something different for a change and post "as I go", instead of asking for help before starting or posting my results AFTER I've finished. The TV would come on normally, but the backlight would cut out after a few seconds.
This particular TV is called Beko, though I've seen the exact same chassis and components under a different brand name, so it may apply to other TVs as well. The inverter says VIT7101 on it, followed by a bunch of other numbers, so I took a picture of that, instead of writing it all down
I took the back off to take some measurements - you know, the usual stuff, make sure the inverter gets power and an ON signal, bla bla - and as I was doing this, shortly after power-up, I suddenly noticed this massive flash coming from the inverter side (it was like an arc welder). This flash also coincided with the moment the backlight went off, so I knew I was dealing with a failed transformer/PCB track somewhere.
I powered the TV again and this time paid close attention to the inverter: sure enough, one of the HV transformers was emitting a very bright light from underneath - T203 in my case. I marked it, removed it and immediately noticed the insulation on the bottom was indeed melted and the secondary winding had some charring on in - none of this was visible from the top side, so I could've examined it all I wanted, I would NOT have found the issue from the "outside". Bingo. I'm now waiting for a replacement to arrive, so in the meantime I thought I'd post my findings. Hopefully nothing else breaks down afterwards
This particular TV is called Beko, though I've seen the exact same chassis and components under a different brand name, so it may apply to other TVs as well. The inverter says VIT7101 on it, followed by a bunch of other numbers, so I took a picture of that, instead of writing it all down
I took the back off to take some measurements - you know, the usual stuff, make sure the inverter gets power and an ON signal, bla bla - and as I was doing this, shortly after power-up, I suddenly noticed this massive flash coming from the inverter side (it was like an arc welder). This flash also coincided with the moment the backlight went off, so I knew I was dealing with a failed transformer/PCB track somewhere.
I powered the TV again and this time paid close attention to the inverter: sure enough, one of the HV transformers was emitting a very bright light from underneath - T203 in my case. I marked it, removed it and immediately noticed the insulation on the bottom was indeed melted and the secondary winding had some charring on in - none of this was visible from the top side, so I could've examined it all I wanted, I would NOT have found the issue from the "outside". Bingo. I'm now waiting for a replacement to arrive, so in the meantime I thought I'd post my findings. Hopefully nothing else breaks down afterwards
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