The flyback may be the problem or the 2s0680 I don't know what to do, because don't have a shematic for the monitor. I don't know at what frequency does the flyback work because I measured 4khz and I think that it is too small.

Compaq V55 612 is a Samsung 400B

Rich

where can I find a samsung400b schematic diagram

Hi try here.

CKA4227L or 5277L



http://www.eserviceinfo.com/equipment_mfg/SAMSUNG_3.html

Rich

This model seems to have a common problem.... The flyback is usually shorted. Try measure the hv cap to ground. If there's ohms, it's kapput.

try the line transformer.
bye. good luck