Star Logic

[2smoovedaddy]

Have a star logic hd20w 20.1 in monitor. The initial issue was horizontal flickering lines but when i took it apart and tested the lamps on the inverter it went 2 seconds to black. I ordered a ccfl tester and the lamps tested fine which points at the inverter board. By the picture how would I go about ohming the transformers as far as pin orientation and what are thoughts. thanks!

[2smoovedaddy]

Re: Star Logic

Here's the pics

[jetadm123]

Re: Star Logic

Once it goes black, do you still see the 12V at the wiring harness of the inverter board?

If you're seeing the 12V at the wiring harness, then unplug the monitor and check for shorts across the two mosfets U1 and U2 on the inverter board.

[selldoor]

Re: Star Logic

Nice job cutting the picture off might have helped to see how many bulbs.
In the absence of a part number you will have to do it the long way. Power off
Meter on ohms 2000 number the pins 1 to ten and test 1>2 1>3 to 1>10
then 2>3 2>4 2>5 to 2>10 and so on untill you find pins that check at 600-1200 ohms
(Unusually could be lower ie 300s) Then chsck just those pins on the other big transformers. Post the results. Hermei caps are not great and may contribute to the problem as might the yellow going brown glue on the black cap.

[2smoovedaddy]

Re: Star Logic

Sorry bout the pics. The P/N=SC1C1001602A.Haven't had a chance to check any voltages yet. ESR meter shows good caps on inverter board.
There's 6 lamps 3 on each side.

T1 (2000ohms)
Pin 1-2=.0003 Pin 2-3=.0003 Pin 3-4=.0003 Pin 4-5=.0003 Pin 5-6=.0003
Pin 1-3=.0003 2-4=.0003 3-5=.0003 Pin 4-6=.0003 Pin 5-10=OL
1-4=.0003 2-5=.0003 3-6=.0003 Pin 4-10=OL
1-5=.0003 2-6=OL 3-7=OL
1-6=.0003 2-7=OL 3-8=OL
1-7=OL 2-8=OL 3-9=OL
1-8=OL 2-9=OL 3-10=OL
1-9=OL 2-10=OL
1-10=OL

Pin 7-8=.0003 8-9=.2590 9-10=.0002
7-9=.2590 8-10=.2596
7-10=.2590
T2 and T3 are the same

CE1(2000ohms)
Pin 1-2=.0116 pin 2-3=.2590 3-4=.2592 4-5=.0115 5-6=2709
1-3=2705 2-4=.0002 3-5=.2710 4-6=.2596
1-4=.0116 2-5=.0116 3-6=.0001
1-5=.0230 2-6=.2594
1-6=2705

CE3 same as CE1

CE2 1-2=.0112 2-3=.2687 3-4=.2689 4-5=.0113 5-6=.2583
1-3=.2574 2-4=.0224 3-5=.2579 4-6=.2693
1-4=.0113 2-5=.0112 3-6=.0001
1-5=.0002 2-6=.2688
1-6=.2576

[selldoor]

Re: Star Logic

Sorry, I cant unravel all that lot perhaps 2000ohms was too low the idea is to locate the secondary wiring which feeds the lamps you may be able to work back from the lamp sockets/connections.The values should be within 3% each transformer drives 2 lamps.
Did you search for other threads? like this
https://www.badcaps.net/forum/showthread.php?t=10275