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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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LCD monitor inverter alternatives
The old CCFL inverter board is too FUBAR to repair. So I decided to use
a couple of cheap 12V dual ccfl inverters (like the kind used for pc-mods, ect) to power the four backlights. The power supply board inside the monitor provided the 12v for them to work and everything works great except...THEY NEVER SWITCH OFF!!!! They stay on even if the monitor is in standy mode! The only time they shut off; is if I unplug the monitor from the power source, of coarse. The connection to the original inverter: 1. VCC (constant 12V) 2. GND 3. ON/OFF (5V) switches to 0V when on standby mode or off 4. DIMMING (2-5V) The inverters are connected to 1 and 2. Could someone please give me an idea what to do here. TIA |
#2
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LCD monitor inverter alternatives
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#4
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LCD monitor inverter alternatives
On 18 Nov 2006 03:14:26 -0800 "
wrote in Message id: . com: The old CCFL inverter board is too FUBAR to repair. So I decided to use a couple of cheap 12V dual ccfl inverters (like the kind used for pc-mods, ect) to power the four backlights. The power supply board inside the monitor provided the 12v for them to work and everything works great except...THEY NEVER SWITCH OFF!!!! They stay on even if the monitor is in standy mode! The only time they shut off; is if I unplug the monitor from the power source, of coarse. The connection to the original inverter: 1. VCC (constant 12V) 2. GND 3. ON/OFF (5V) switches to 0V when on standby mode or off 4. DIMMING (2-5V) The inverters are connected to 1 and 2. Could someone please give me an idea what to do here. TIA Two things: 1. Can you see what chip is on these inverters? 2. What chip is on the original inverter? You might be able to tap directly into the new inverters from your old controller, if the chips have an enable pin. |
#5
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LCD monitor inverter alternatives
if he is using PC CCFL invertsers like i says hes using, most likely its a
simple 2 transistor inverter. wrote in message ups.com... The old CCFL inverter board is too FUBAR to repair. So I decided to use a couple of cheap 12V dual ccfl inverters (like the kind used for pc-mods, ect) to power the four backlights. The power supply board inside the monitor provided the 12v for them to work and everything works great except...THEY NEVER SWITCH OFF!!!! They stay on even if the monitor is in standy mode! The only time they shut off; is if I unplug the monitor from the power source, of coarse. The connection to the original inverter: 1. VCC (constant 12V) 2. GND 3. ON/OFF (5V) switches to 0V when on standby mode or off 4. DIMMING (2-5V) The inverters are connected to 1 and 2. Could someone please give me an idea what to do here. TIA |
#6
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LCD monitor inverter alternatives
The old faulty inverter uses the BIT3105 CCFL controller chip FYI, I tried to replace the four shorted mosfets (FDS8958A) but they still keep frying...maybe a shorted primary winding on one (or more) HV transformers? The cheap "PC-mod" inverters seem to work great so far with the transistor switch. Thanks for the help everyone! |
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