hp6730b no backlight , lcd, inverter changed no luck, need someone guide to fix plz
hp6730b backlight problem
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by DanPokaI bought this p2210f dell monitor to fix. Schematic is the same as p2210.
Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered...-
Channel: Troubleshooting Computer Displays
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by DobrowolHi. I have a problem with Asus ROG GA402RK. The keyboard suddenly stopped working along with the kb backlight. I replaced the keyboard and the ITE KBC chip and the problem is still the same. I don't see any passive elements that look damaged. Does anyone have an idea?04-28-2025, 04:30 PM
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by fanaticgameshello I have a backlight problem on this TV, if I unplug the cn201 cable the backlight works perfectly and the voltages are 13v if I connect the cn201 cable the backlight goes off and the voltage drops to 12v, I assume it's a motherboard problem, the question is has anyone had a similar problem? I want to understand if the motherboard is repairable or it's not worth wasting time...
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by HonziqHello,
I have this All-in-one PC, after SSD change there is no picture. I was found out it is a backlight problem, but LEDs are OK. There is 4 led strings each working on 42,4V, but from board is comming only 5V.
I was repaired many backlights before but this design i will not understand.
For me it looks like it is waiting for some signal from screen to start up the backlight or something like this. Nothing seems to be damaged or shorted here.
Can someone explain me please what to do, what to check?
Thanks....-
Channel: Troubleshooting Computer Displays
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by grbo92Hi,
i have one acer Nitro 5 without backlight on my desk.
Mainboard model: LA-L031P GH53Z REV 1B
Attached schematics and boardview are REV 1A, slightly different as REV 1B.
11411_LA-L031P-Acer_Nitro_5_AN515-45_AN517-41-GH53Z_Rev_ (1).zip
Repair history: customer cleaned dust and changed thermal paste, shortly after that there was no light
Notebook boots without problem and shows only image without backlight, HDMI output working. Optical inspection done, no burned or broken components. Tested also with a new display module.... - Loading...
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