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Old 09-18-2018, 05:34 AM   #1
ivanoxx
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Default iiyama 24" E2407HDSV [DEAD]

Hi lads, I've been trying for several months (mostly waiting for parts) to repair my monitor. Before its definitive death, monitor was shutting off and on repetitively and then it just died. Led is not lit, completely dead. Now i have replaced all caps, fuse, and mosfet. I tried to replace IC LD7576PS which didnt help me. ( https://michaeljaylissner.com/archiv...TMS2431_SM.pdf ) here are schematics, different monitor, same psu.

What else could it be? What component is "triggering" something so it could start up.

Last edited by ivanoxx; 09-18-2018 at 05:38 AM..
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Old 09-18-2018, 05:35 AM   #2
ivanoxx
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Default Re: iiyama 24" E2407HDSV [DEAD]

https://imgur.com/a/yU9um5v

this is the board


IC LD7576PS has in datasheet:

On/Off Control
By pulling COMP pin lower than 1.2V will disable the gate
output pin of LD7576X series immediately. The off mode
can be released when the pull-low signal is removed.

what does this mean?

then this : Over Load Protection (OLP) - Latch mode

"... As soon as the
over load condition is removed, the controller will be kept
latched until the Vcc drops lower than 8V. It is necessary
to start another AC power-on recycling to get the output
back. "

Last edited by ivanoxx; 09-18-2018 at 05:43 AM..
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Old 09-19-2018, 12:39 AM   #3
ivanoxx
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Default Re: iiyama 24" E2407HDSV [DEAD]

Could Faulty OZ9937GN lead to monitor not turning ON? Even if its IC for CFL. what component of the monitor is Turning monitor ON if PSU has every voltage right - potentionaly.
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Old 09-19-2018, 09:20 AM   #4
budm
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Default Re: iiyama 24" E2407HDSV [DEAD]

Just to be clear:
1) Do you have ANY DC Voltages on that white connector of the power supply board that goes to the main/logic board?
2) Power supply board is an always on power supply, it is always running, the main logic board will send out the BL-ON control signal to turn on the backlights circuits.
3) It that the pictures of YOUR board and not from the WEB? The caps looks original and I do not see any soldering works on the board.
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Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Old 09-19-2018, 10:19 PM   #5
ivanoxx
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Default Re: iiyama 24" E2407HDSV [DEAD]

I have 0.035V going in white connector, and yes those pictures are from web unfortunately, But I tried my best to shoot mine. https://imgur.com/a/EJcrJuV
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