Re: IBM Thinkvision 6736-HC9 No power
Ok in the mean time I will start by check resistance on the small caps and resistors around the IC and see if I come up with anything that looks bad or out of the ordinary.
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
Re: IBM Thinkvision 6736-HC9 No power
After looking at the NEW measurements it looks like nothing has changed. Even though I changed the IC and all the caps except the 2 big filter caps. To me that says theres still a component not doing its job... not sure whats next on the list to check....
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
IC ohm reading with no power
pin 1-22kohms
2-47kohms
3-1kohms
4-ground
5-2kohms
6-304k
7-NA not used no reading
8-500+ kohms
DCV
PIN 8-142-160v
PIN 6-5.5-8.2v
the 3-5v pins going to the logic board were reading about the same as before
about 1.5vLast edited by eckertb83; 03-29-2014, 06:18 PM.
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
OK guys I Finally got time this evening to sit down and desolder and solder the new parts on. Once I got it all together I put it back on and plugged it in and still no power. I will pull it off tomorrow and get voltage and resistance readings with the new parts on. I will be checking the resistance on the IC pins with #4 as ground and also get the voltage on PIN 8 and 6 as well as the 5v pins going to the logic board. also going to check the fuse to make sure it hasn't blown. I will report back asap
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
ok ordered the new caps and IC once they come in and get them replaced I'll post back.
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
and the IC is ok or should I get one and replace it as well?
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
Ok Finally was able to get back to this,
Resistance on Pin 8 with ground on Pin 4 is 850000 Ohms Its probably more than this after holding it for about a min it just kept climbing.
Voltage for Pins 8 & 6
Pin 8 161DCV
Pin 6 5.9-8.3dcv it bounced around between these numbers
Also Heated up the 2 small caps and there's NO Voltage change on the 5v pins going to the logic board...
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
"all done with back probe on PIN 4 Ground.
1-004------4000Ohms
2-046------46000Ohms
3-001------1000Ohms
5-002------2000Ohms
6-329------329000 Ohms
Does this look/sound right?
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
I'm sorry I still dont understand the difference between ohms, K Ohms and M ohms and the settings on the DMM. I will google it..... So I know for future reference. I had my DMM set 2000K so I would guess K Ohms....
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
Ok I will put them on my list of stuff to order. So with not getting a reading on the IC pins 7&8 I as assuming that is bad and needs to be replaced as well? Did you happen to see the pic I posted of it? is the 1203D6 the correct part #?
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
I havent heated up the 2 little caps yet, but did test the voltage going to the logic board and the 3 pins labeled 5v I was getting about a 1v reading. I will heat the 2 small caps up and see if that changes anything
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
I'm not exactly sure what you are saying.
"why don't you test carefully pin 8 HV and pin 6 Vcc in volt? To be sure that the part is same as what i found check if pin6 is connected to pin+ of little near electrolytic."
Pin 8 HV DCV?
Pin 6 VCC? I've never heard that before.
Pin 6 connected to + of little Eletrolytic? you mean capacitor right?
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
Yes that is what I mean, That is also why I stated it was on the left of the meter.
Reading through the "2sec to black guide" I remember reading that when checking resistance use 200Ohm setting for most/all parts. Even the other monitor that DID have a bad MOSFET and Bridge I tested them with 200Ohm setting .
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
SMPS IC is what I'm testing, that I cant get any reading like its shorted. I have cleaned the probes and still the same thing. I posted a pic of the IC so you can see the part number. I believe the data sheet Budm posted is correct for this part.
I still have to try heating it up and checking it for voltage.
as far as the MOSFET i did re-test it still shows as being shorted.
DMM set @ 200 Ohms
blk probe
pin1- pin2=1
1-3=1
2-3=1
all on the left side of the DMM
I...Last edited by eckertb83; 02-16-2014, 01:29 PM.
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
I am trying to measure resistance but cant seem to get any thing. There was some sorta glue that I had to clean off before I could actually do anything. I had the DMM set at 200 Ohms and couldn't get any reading off any of the pins. Does this mean its shorted?
"You also try heating up the two small caps next to the S shape heat sink where the MOSFET is mounted on to see if the power supply will start up."
Do I have to connect it back to the video board and heat it up then try to turn it on?
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
IC-
203D6
PTFP
I will try to heat them up with my heat gun and report back.
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
Yes I am getting between 159 and 162 DCV on the 2 filter caps. I'm not positive but I may have had the switch in the wrong position the first time I tested them.
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
I removed the heat shrink wrap from the thermistor and this is what is printed on it-
SCK
086
I am getting about 117VAC at the ~ pins. It jumps around a little but not much 116.8-117.4 VAC
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
yes that's ohms, I had the DMM set to 200. I flipped the board over to look for the Thermistor (TH) I couldn't locate. Where about should it be?
Leave a comment:
-
Re: IBM Thinkvision 6736-HC9 No power
OK I tested just to 2 points on the bridge rectifier ( between + and -) and I dont get any reading at all.
Didnt see your post budm, I did check resistance between those 2 points
Live resistance 10.0
Netural resistance 1.6Last edited by eckertb83; 02-12-2014, 05:02 PM.
Leave a comment:
No activity results to display
Show More
Leave a comment: