LG Studioworks 775N / EV7001 (CA-65) doesn't start

the_ccm · Guest

Hi,

I've got a problem on a LG 775N monitor.

When I power-on the monitor, the power led goes on. A relay is clicking, I hear some noise as if the high-voltage is generated and then it stops. The relay is clicking and the power-cycle starts over again.

I check secondary voltages on SMPS, there is 4 lines : 75V, 160V, 6.3V and 15V. Everything seems to be ok except for 15V line which is only 11V , i thought one component were dead on the 15V line but couldn't find one ?? also on THT no -30V, -120V, -40V etc. also B+ transistor driver (IRF9530) is very hot after 30 seconds ......

the_ccm · Guest

Ok maybe this will help :

when "DPMF Low" is low, V1 equals to 15V and V2 nearly 0V, which is normal. But when DPMF is 5V, V1=11,2V and V2=11V. Output current on transistor collector is 0.33A , but even if i cut all after transistor output, and i place a 100Ohm resistor for example (0.15A), V1 fall down to 11,8V ??? D924 and C925 have been changed without success .................

Thanks for your help

Guest · Posted: Mon Aug 29, 2005 10:12 am Post subject: I have same problem

Hi,

I Have same monitor too and also I have same problem too. Did you find any solution for this.

Thanks

Baris

Guest · Posted: Sat Oct 15, 2005 8:08 am Post subject:

check on crt bord their is any dry solder i found many time in 15 "

Kulfi · Guest

Same Problem
did any one found any solution.
Thanks

Guest · Posted: Tue Dec 25, 2007 5:08 pm Post subject:

your FBT is gone. Change it

Guest · Posted: Sun Sep 26, 2010 6:16 am Post subject:

Same Problem
did any one found any solution.
Thanks