I recently had a similar problem and posted a photo of the Chinese jumpers to Chinese Stack Exhange
[URL]https://chinese.stackexchange.com/q/59967/43628[/URL]

Basically, jumper, 1-2 means “programmer.” That activates the programming line (ACT#) on the chip. Jumpers 2–3 translate to “brush machine,” while “brush machine” idiomatically means “flash programmer,” what it's really doing is disconnecting the programming line and setting up the system to use the USB to RS-232 as pass-through at TTL level. It seems that all USB the serial converters are called, brush...

Re: Dell 2007WFP Constant On/Off

This was EXACTLY my problem. My 2.7k resistor was actually showing wandering resistance when measured - it kept changing!

I unsoldered it and tore the pad. I then traced the pcb traces and connected the resistor (only 2.2k) to the transistor and IC directly for better mechanical strength.

I tore off some of the excess heat sink tape between the power supply and chassis to add back in some thermal mass for those resistors to replace the removed glue.

So far, so good. I would have NEVER found that failed resistor....

Re: coby tftv4028 mainboard #002-FV40-2810-00R ver:1.0 need opinions!

There are 3 different mainboards for the TFTV4028, depending on the panel and inverters used - maybe even different LVDS/T-CON as well. I learned the hard way.

Coby 002-FV40-2813-00R for AU Optronics T400HW03 panel
Coby 002-FV40-2812-00R for Samsung LTZ400HF21-W01 panel
Coby 002-FV40-2810-00R for Samsung LTA400HM02 panel

They are all slightly different.

I've been meaning to make a table of power supplies, inverters and mainboards that appear in a "TFTV4028"...

Re: Coby TFTV4028 - Main board failure.

There are 3 different mainboards for the TFTV4028, depending on the panel and inverters used - maybe even different LVDS as well.

Coby 002-FV40-2813-00R for AU Optronics T400HW03 panel
Coby 002-FV40-2812-00R for Samsung LTZ400HF21-W01 panel
Coby 002-FV40-2810-00R for Samsung LTA400HM02 panel

They are all slightly different.

Good photos of that at shopjimmy.com, though.

I've been meaning to make a table of power supplies, inverters and mainboards that appear in a "TFTV4028"...