This is must be one of the worst design as far as for putting it together or taking apart. Wires are so short, it takes two people to get this thing apart without breaking the lamps wire, the plugs for the lamps are glued down. I worked on many monitors, this is one of the worst. It is 24" screen so I had to be real careful not to damage it. It has bad caps.
Optiquest Q241WB one of the worst
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Optiquest Q241WB one of the worst
This is must be one of the worst design as far as for putting it together or taking apart. Wires are so short, it takes two people to get this thing apart without breaking the lamps wire, the plugs for the lamps are glued down. I worked on many monitors, this is one of the worst. It is 24" screen so I had to be real careful not to damage it. It has bad caps.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=24809Tags: None
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Channel: Troubleshooting Audio Equipment
05-22-2025, 11:41 AM -
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by angelosHi Guys,
It's been a while that i have been active on the forum, sorry for that. My primary job has been keeping me quite busy.
The above set starts up with sound working just fine but the CCFL lamps (Inverter) runs for one second and switches off.
My 24V supply is steady and the ON/OFF pin to the inverter is at +5V.
The only thing i see is the PWM signal pin is at +5V without any square wave being emitted. Is this normal? as far as i can remember there needs to be a square wave pulse there. Am i right?
I will now measure with my oscilloscope probe on... -
by eccerr0rI was playing with one of those "filament" LED lamps. I noticed it seemed to flicker a bit...so I tried powering it with different things to try to extract information about it - noticed it seems to be 100% LED - no droppers, no PSU, no rectifiers, nothing - the LED "filaments" are hooked straight to the contacts!
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Found another "filament" LED that does have a PSU in it, seems to be a capacitive... - Loading...
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