I was given a 46" Dynex that would light up for 10 to 30 seconds then go dark. Sound works find and there's no whining/buzzing sound coming from anything.
I fixed a 21" monitor about a year ago with a kit from here so I thought I'd start with the caps on the TV. Nothing looked obvious and all the voltages tested good even under load.
I replaced all the large caps on the inverter for the heck of it but no change.
So, researching on the forum I discovered other things that usually go wrong with Darfon inverters. All the fuses and transformers tested ok. With a sugestion from a thread to look at it in a dark room I discovered one of the 12 lights wasn't working.
I thought I could swap which transformer and circuit was powering which lamp by unsoldering the HV lead and associated ceramic cap and jumpering to the next lamp. In essence I wanted to swap the outputs of an adjacent transformer to see if the suspect lamp would light. The result was the '2 seconds to black' and I think the suspect lamp is still dark (goes off to quickly to really tell). So I remove the jumpers and put everything back and I get almost 30 seconds of light again with the suspect lamp being dark.
Now, a used inverter is $20 on ebay and with the $9 for the caps already spent, $30 would be a good price if it would work. Thing is with the one bulb being dark it could be the bulb and not the inverter. At which point it might not be worth fixing (see p.s.)
How can I test the bulb or bulbs before buying an inverter?
I'm open to other suggestions.
Thanks for looking,
davidk
Dynex DX-46L150A11
Display T460HW03 VF
Inverter - Darfon V291-5xx , 4H+V2918.061 /B
Chip on the inverter is OZ9937GN
Power supply # 569KS0720A 2009.12.18
Main board # 569KS0169C
p.s. I've seen bulbs for sale various places and actually replaced two on my laptops. But with 12 bulbs and only one new one wouldn't the color difference be a bit much.
I've seen 1000mm bulbs for $25. Replace them all and that's $300. A bit much for a free TV for my son.
I fixed a 21" monitor about a year ago with a kit from here so I thought I'd start with the caps on the TV. Nothing looked obvious and all the voltages tested good even under load.
I replaced all the large caps on the inverter for the heck of it but no change.
So, researching on the forum I discovered other things that usually go wrong with Darfon inverters. All the fuses and transformers tested ok. With a sugestion from a thread to look at it in a dark room I discovered one of the 12 lights wasn't working.
I thought I could swap which transformer and circuit was powering which lamp by unsoldering the HV lead and associated ceramic cap and jumpering to the next lamp. In essence I wanted to swap the outputs of an adjacent transformer to see if the suspect lamp would light. The result was the '2 seconds to black' and I think the suspect lamp is still dark (goes off to quickly to really tell). So I remove the jumpers and put everything back and I get almost 30 seconds of light again with the suspect lamp being dark.
Now, a used inverter is $20 on ebay and with the $9 for the caps already spent, $30 would be a good price if it would work. Thing is with the one bulb being dark it could be the bulb and not the inverter. At which point it might not be worth fixing (see p.s.)
How can I test the bulb or bulbs before buying an inverter?
I'm open to other suggestions.
Thanks for looking,
davidk
Dynex DX-46L150A11
Display T460HW03 VF
Inverter - Darfon V291-5xx , 4H+V2918.061 /B
Chip on the inverter is OZ9937GN
Power supply # 569KS0720A 2009.12.18
Main board # 569KS0169C
p.s. I've seen bulbs for sale various places and actually replaced two on my laptops. But with 12 bulbs and only one new one wouldn't the color difference be a bit much.
I've seen 1000mm bulbs for $25. Replace them all and that's $300. A bit much for a free TV for my son.
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