Re: Coby Flat Panel TV Bad Inverter

Thanks PlainBill for the service manual. I will dig into this and get back to you.

Re: Coby Flat Panel TV Bad Inverter

PlainBill, here is my feedback for you.

The one on the left should go to the solder pad circled in bright red. I think a jumper conducts the signal to the point circled in dark red. Please confirm that.
[B]Answer [/B] - Yes that is correct

I'm not sure where the signal from the pin on the right comes out from under the goop.

[B]Answer[/B] – I removed the goop and traced it in yellow, see attached photo

Pin 15 (outlined in blue) on the controller is the current sense pin. I THINK...

Re: Coby Flat Panel TV Bad Inverter

Just an update. I was able to find a mod kit at Frys for 8 bucks. I tested each LCD screen bulb individually by connecting it to the mod kit inverter and the bulbs worked OK and did not go blank as they do when connected to the TV inverter.

I have at least eliminated the TV bulbs being the issue, which is what I thought but wanted to confirm.

Re: Coby Flat Panel TV Bad Inverter

Bobdee - thanks for the help and information

PlainBill - thanks for comments. Per your request, I have added a bottom view of the inverter, please let me know if this is not good enough quality for your needs.

As I noted in my original post, the caps look OK, no bulges. But if you think I need to eliminate variables and should replace them, I can. The list is as follows:

6 - Capxon KF 1000 uf 25V
1 - Capxon RK 100 uf 16V
1 - Capxon KM 10 uf 50V

Any help to xref these to...

Re: Coby Flat Panel TV Bad Inverter



Thanks, I have added a close up picture of the ICs on bottom of the board. The 16 pin IC is BIT3713.

Any ideas to troubleshoot are greatly appreciated.
Thanks...

Re: Coby Flat Panel TV Bad Inverter



Thanks for the feedback. IC part number is STM6920A. I was able to find a [URL=http://pdf.samhop.com.tw/pdf/STM6920A.pdf]datasheet [/URL]. I checked for shorts on G D S and found none. It still could be bad.

Would you recommend replacing it anyway and if so any recommendations on where I can purchase one?

Thanks for the helpRe: Coby Flat Panel TV Bad Inverter



Thanks for the feedback. IC part number is STM6920A. I was able to find a [URL=http://pdf.samhop.com.tw/pdf/STM6920A.pdf]datasheet...

Re: Coby Flat Panel TV Bad Inverter

I tested the bulbs individually, not at the same time. I think it would be rare that both bulbs would fail at the same time, unless the inverter induced it. Which still brings me back to the inverter.

I do not have a good good inverter to test with, but could see about buying a new bulb to test with if you think it is a high prob. that the bulb is the issue.

I have a Coby 15" flat panel TV that appears to have a bad inverter. When I turn the TV on, the power light goes green and stays green, but the backlight (2 bulbs) only comes on at powerup for a few seconds and then goes blank.

I confirmed the TV is working OK, I have sound and with a flashlight behind the screen ( BOE HT150X02 disassembled) , I can see the picture. The setup and mode features all work OK.

I have confirmed the inverter has 5V and 12VDC. I connected each bulb individually and switched connections on the inverter and powered up. Both bulbs went...