Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

GNR VL770-M (CM1772FS) CRT monitor problem

Status
Not open for further replies.

xxvoves

Newbie level 1
Joined
Feb 28, 2006
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,289
Hi,
I have problem problem : monitor goes to stdby after 7 seconds from switching on. Before this is normal picture in any resolution, but insufficient horizontal size (adjusting in OSD works). Voltages in power supply are stable, capacitors checked. Checked voltages on x-ray, i-sense and vcc pins of STV6888 deflection processor, there are correct values. I am not able to measure CRT anode voltage, I haven't HV probe. Voltage regulation for HOT looks OK. Is it HV transformer, deflection yokes, something else ? Can you help me, please ?
Thank you
Michal
 

UNIMASTER

Newbie level 3
Joined
Mar 6, 2006
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,308
Is the hsize regulation insuficient in all resolutions? if yes, check the Condenser values around Flyback, even check Flyback too, if not, may be some of the hsize correction fet is shorted, but if monitor goes to stndby, there must be any protection tirggering, try to found wich one is?, I suspect your problem is Flyback, good luck
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top