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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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Help : IBM 17" LCD 6657-HG2
I have this 17" IBM LCD monitor with these symptoms;
The power switch works fine, when depressed, it goes into Yellow, I can press it again and turns off. I do not get any display at all, with the cable disconnected from the video card, I should get the " Check cable" screen appearing. I would think that if it were only the "Backlight" or the inverter module, I could shine a flashlight through the screen and I would be able to see my display but it does not work. I suspect that somewhere, there is self test portion shutting down so it never gets to display anything on the screen. Has anyone troubleshut one of these units before? What is a proper troubleshooting procedure? Are all LCD screen, basically working the same way or some of them have got protection circuitry making it harder to actually troubleshoot? I have checked all electrolytic capacitors, some 100uf 16Vdc and one 10uf 10Vdc is reading a bit resistive but not totally out of wack, reading 12 versus 8 on my Dick Smith ESR meter. I do not see any voltage coming out of the inverter, I could have jumped to the conclusion that it is the defective module but then there could be a circuitry shutting it down if something else has not come up on time or something like that. I wish I had another unit exactly the same to troubleshoot to the board level. Any idea? Any help appreciated |
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Help : IBM 17" LCD 6657-HG2
I figured it out, the 10uf 16Vdc electrolytic capacaitors SMD qty 8 were bad. I suggest to check them all and replace them. Some of them were hard to replace, I had to remove the metal case around the connectors because they were behind them. "Mike & Danielle" wrote in message ... I have this 17" IBM LCD monitor with these symptoms; The power switch works fine, when depressed, it goes into Yellow, I can press it again and turns off. I do not get any display at all, with the cable disconnected from the video card, I should get the " Check cable" screen appearing. I would think that if it were only the "Backlight" or the inverter module, I could shine a flashlight through the screen and I would be able to see my display but it does not work. I suspect that somewhere, there is self test portion shutting down so it never gets to display anything on the screen. Has anyone troubleshut one of these units before? What is a proper troubleshooting procedure? Are all LCD screen, basically working the same way or some of them have got protection circuitry making it harder to actually troubleshoot? I have checked all electrolytic capacitors, some 100uf 16Vdc and one 10uf 10Vdc is reading a bit resistive but not totally out of wack, reading 12 versus 8 on my Dick Smith ESR meter. I do not see any voltage coming out of the inverter, I could have jumped to the conclusion that it is the defective module but then there could be a circuitry shutting it down if something else has not come up on time or something like that. I wish I had another unit exactly the same to troubleshoot to the board level. Any idea? Any help appreciated |
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