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
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jun 11, 2011 | IBM E74 17" CRT Monitor
Nov 24, 2007 | Relisys RLT1720 17" LCD Monitor
Feb 25, 2011 | IBM ThinkPad T41 Notebook
Aug 31, 2010 | Health & Beauty
Aug 20, 2008 | BenQ FP71E 17" LCD Monitor
Apr 22, 2008 | BenQ FP72G+ 17" LCD Monitor
Dec 11, 2007 | Acer AL1711 17" LCD Monitor
Mar 03, 2014 | IBM ThinkVision L170 17" LCD Monitor
658 people viewed this question
Usually answered in minutes!