ShareFX Electronic Repair Forum Free Service Manuals - ShareFX.com
July 29, 2010, 15:18:07 *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News: Welcome to our Brand New Forum
 
 
   Home   Help Login Register  
Pages: [1]   Go Down
« previous next »
  Print  
Author Topic: HP 1702 17" Inc LCD Monitor corrupted image  (Read 2169 times)
0 Members and 1 Guest are viewing this topic.
messico744
Newbie
*
Offline Offline

Posts: 5


View Profile
« on: September 01, 2008, 04:24:19 »
Hi to all,
 I have a HP 1702 17" that after a 10 mins of power on, begin a corruption in the lower part of the screen.
It seems that, only on the lower part of the screen, the image goes up and down frequently in about 1 mm.
The rest of the screen are good, and the backlight is OK. I try to replace all the capacitors of the Inverter/Power board without fixing it.
Freezing the IC on the main board (PWB-0706-01 M1) U6 (MST8111B) fixes the problem for a couple of minutes.
Thanks for any suggestion.
Sorry for bad english  Sad
Bye.
Logged
terminator2k2
Newbie
*
Offline Offline

Posts: 5


View Profile
« Reply #1 on: September 01, 2008, 10:45:35 »
sounds like it is actualy the ic you are freezing which is the problem or a component close by...try shielding the ic so you only freeze the ic....if this shows the ic is faulty then only by replacement will this cure the fault. or you could try reflowing the ic first to see if that works.....but too me sounds like you have already found the problem and need the ic replaceing...if it is a regular smd ic and you can solder ok you try using chipquick...google it....
Logged
messico744
Newbie
*
Offline Offline

Posts: 5


View Profile
« Reply #2 on: September 02, 2008, 05:18:28 »
Thank you very much Terminator2k2 Smiley
I will try to shielding the IC and freezing.
I am waiting for the Hot Air unit to try resoldering.
Some times if i press the IC with a finger, the problem seems to fix.
I think is a soldering problem. I will try to reflowing the IC and i will let you Know the results.
Thanks another time for the quick answer.
Ciao.
Logged
messico744
Newbie
*
Offline Offline

Posts: 5


View Profile
« Reply #3 on: September 15, 2008, 00:41:26 »
Hi,
 the Air unit is arrived.
I Try to reflowing the IC and now it seems that the defects comes in the middle of the screen not in the bottom.
I think i have to redo soldering with some soldering cream, but it is many years that i didn't use the hot air unit.
If the problem has changed reflowing, i think it is surely the IC bad soldering.
Thanks, i will post the results.
Bye
Logged
messico744
Newbie
*
Offline Offline

Posts: 5


View Profile
« Reply #4 on: September 17, 2008, 03:12:42 »
Hello,
 finally i can fix the problem.
I have to reflow the IC with hot air, and then with the Iron Solder, i redo all SMD (SMT) contacts on resistor, caps and others ICs on the Main Board. This fix the problem.
Thanks for all suggestions.
Bye.
Logged
messico744
Newbie
*
Offline Offline

Posts: 5


View Profile
« Reply #5 on: November 07, 2008, 06:21:15 »
Hi to all, i have to Update this Topic because i found that the solution works only on some Boards.
On other board seems that there is a bad connection or something like that because if i press the board near the main IC the problem seems to fix.
I also see that if i put the refresh rate to 75, the problem incrase. If i let the video at 60 the problem is less.
I try to replace quatzs but didn't help.
Thanks for any suggestion.
Bye
Logged
Pages: [1]   Go Up
  Print  
« previous next »
 
Jump to:  

Powered by SMF 1.1.5 | SMF © 2006-2008, Simple Machines LLC
Page created in 0.128 seconds with 30 queries. (Pretty URLs adds 0.042s, 2q)