Often see base someone speak repair dark screen experience,toshiba satellite l650-0dn laptop cpu fan
but are one-sided. Now I put my dark screen repair some of the experience and share with you, hope to the improvement of all to have some help. This but I am in the process of maintenance summed up the experience of out!
We fix dark screen first have to know which caused reasons, nothing more than this several ways:
1, tube damage. 2, high pressure plate damage. 3 screen line open circuit and mainboard failure.
The dark screen most is the result of a damaged tubes, a small part of the high pressure plate is the result of a damaged. Screen line and motherboard cause dark screen probability is very low, but the most trouble.
(a) tube failure:
First of all we want to tell if tube damage,toshiba satellite l650d-03j laptop cpu fan
here to use a homemade tool: external tube, external tube making very simple, use namely a piece of ordinary light tube two head each connected to a single line, again in this two root online after a high pressure plate universal plug tip. Run into dark screen as long as the original screen on the high pressure inserted pin drawing down, again our external tube inserted pin plug in, again boot, if this time lamp lit, that is flashlamp fault, direct to change a light tube line.
(2) high pressure fault:
If the external tube not bright, is high pressure plate or high pressure plate former pole failure, at this time we should measure mainboard to high pressure plate few power supply:
1, 2, 3 main power supply control, brightness adjustment 4, ground
(1) the first to test the main power supply, high pressure plate on high pressure plate to the biggest capacitance is usually the main power supply. The main power supply some machine with common point voltage, that is to say common point is 16 v high boards for power supply is 16 v, common point is 18 v that high pressure boards for power supply is 18 v. Still have a kind of is to use motherboard provides 5 v as high voltage power supply boards.
(2) control, control are generally a standard 3.3 V power supply.
(3) brightness adjustment, a 2 v or so voltage,toshiba satellite l650d-101 laptop cpu fan
and its features are you using a multimeter to test its voltage, then go to the keyboard according to the brightness of the control key, at this time you see it as the voltage will change.
(4) the ground, are generally attached to the screw place, or capacitor side. General exhaust line continuously won't appear state.
The more the pin are generally the feedback.
If the measurement of the power have of words, is generally high pressure plate is broken. If there are original direct change will do, especially with feedback, the use of the original. If there is no original high pressure plate, it will need to change high pressure plate, general use a piece of general high pressure plate, again each voltage fly line, general high pressure moderators power supply general from 5 v to 20 v, notebook toshiba satellite l655d-12k laptop cpu fan
to high voltage main power supply will not beyond this range. If it is with feedback, and haven't original high pressure plate, at this time will have some trouble, it must be the original machine of high pressure plate shears first half, namely remove high pressure coil bag. For it to the general high pressure plate, then the exhaust line inserted into the original high pressure plate, fly line to the general high pressure plate, tube inserted into general high pressure plate on line. This used to original high pressure plate coil damage, and the first half of the normal, with the first half of the feedback to fake host, let it normal output high pressure of each power supply.
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