Question about IBM ThinkVision L170 17" LCD Monitor
The only numbers that come up for me are the 4800 as in an A04800 dual MOSFET array whose datasheet can be found here. http://www.aosmd.com/pdfs/datasheet/AO4800B.pdf
Remove the single retaining screw from each of the CCFL tube holders, remove the epoxy from the connectors and then disconnect the tube connectors and remove the 2 CCFL tube holders in plain sight (keeping the tubes themselves contained in the holders) from their places in LCD frame--so you can lay the holders in plain sight, then reconnect the tubes. Observe the tubes during power up...just be careful not to allow metal parts to make contact with other components or anywhere on the trace...if you observe one or more tubes dim or refusing to ingite, swap tube connections to isolate and determine whether the problem is faulty tube or power supply to the tube. If the issue is that no tubes light, check the pins of the BIT3105 Controller on the power supply circuit
whose datasheet can be found here: http://pdf1.alldatasheet.com/datasheet-pdf/view/78519/ETC/BIT3105.html
you should see similar values to these:
ϑ 7.43V on AVDD and PVDD
6.96V on CMP
1.25V on RTDLY
ϑ 7.4Von NOUT2, NOUT1, POUT1, and POUT2
1.52V on EA
213 Kω on PWMOUT
1.3V on CTPWM
.6V on DIMDC
3.9V on SST
If you do not have INN voltage, check the the four 25v47µf caps connected to the BIT3105 CCFL controller (top-center of the board) and then the large electrolytic caps 10v1000µf cap (C551), 25v470µf cap (c661). visually check for domed tops or bulged sides. if these all check good, check the rectifier and regulator on the heatsink by the two large caps. then check the rest of teh electrolytic caps as before. continue working back in the circuit until you reach the Main A/C-D/C circuit.
Posted on Oct 28, 2008
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Posted on Jan 02, 2017
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