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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-31-2022, 09:29 AM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

Possible as I was having issues with the leads when I checked it. New ones on now. I ordered that chip to try anyway.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-30-2022, 02:08 PM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

changed leads. The readings are correct now.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-30-2022, 01:58 PM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

I think something screwey with my meter now all different readings
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-30-2022, 01:51 PM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

first starts at 225k and climbs but the other stays at 389k
Second OL on one and 450k on the other Third OL and .614m so guessing that first mosfet no good?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-30-2022, 12:55 PM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

Must have had bad connection on that one VCC 19.39v pic of my meter.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-30-2022, 12:25 PM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

The readings were taken the same way I read the chip numbers so hopefully same as the pic.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-30-2022, 11:44 AM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

This is just left of the 2 mosfets. Not sure if it's what you want. Hard to read but top line looks like BQ next line looks like 24780S next TI 571 next AYZY
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-30-2022, 09:21 AM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

Don't know what one that is or what to look for.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-29-2022, 04:19 PM
Replies: 16
Views: 427
Posted By CraigR
Re: Hp ZBook 17 G3 Not turning on sort of ???

Is this what you need? Also might not matter but that mosfet under the thermal camera was pulsating warm/cold over and over just with cord plugged in.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-29-2022, 03:14 PM
Replies: 16
Views: 427
Posted By CraigR
Hp ZBook 17 G3 Not turning on sort of ???

I have an hp ZBook 17 that will not turn on with the power button. I do have a charge light. I have the board out and the switch is good then I found something not making sense to me. A mosfet (see...
Forum: Troubleshooting TVs and Video Sources 02-04-2022, 12:46 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

Replaced them both again and still no joy. Here is a pic of old one on left and new on right.
Forum: Troubleshooting TVs and Video Sources 02-04-2022, 12:09 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

Well it happened so fast and was never a steady voltage on the big cap. I think I seen 380v then down to 100 something but was very fast. I was asking about BD801S I think it is. Would you think I...
Forum: Troubleshooting TVs and Video Sources 02-04-2022, 11:43 AM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

R_J I was thinking that when I checked voltage at the big cap it was also fluctuating so would still be a problem on the hot side of the board. Would the rectifier have anything to do with it???
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 05:20 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

RL822 checks ok and I did replace ZDL801 at the same time as other one. Thank you R_J for your time as it's much appreciated. I need to quit for the day but if you think of something please let me...
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 05:09 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

Pulled all caps and tested with ESR meter and were almost spot on. No bulging either. I had to also replace RL820 was open and also replaced the zener diode ZDL802 was also open.
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 05:01 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

QL801 and QL802 are new.
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 04:54 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

from 54v to 11v constant fluctuation.
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 04:39 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

On JP840 I get voltage up and down. but with BLU_ON/OFF jumped to ground I get no volt. Is that what you wanted to know?
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 04:11 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

Just pulled them and checked with component tester and good.
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 03:45 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

They do! they stay normal now.
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 03:23 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

Ok, so now what can I check?
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 03:08 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

172v in standby and 386v on.
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 02:59 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

I'm now just guessing at things and tested this resistor RP820 and out of circuit it's 0.11 but I can not find a chart online that the colors work with. Under the scope it looks black, gold, black,...
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 02:51 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

Yes, it stays at 5v
Forum: Troubleshooting TVs and Video Sources 02-03-2022, 02:32 PM
Replies: 48
Views: 1,214
Posted By CraigR
Re: Samsung UN55EH6000F Power issue

Ok, yes I get 5v on JP809 with it jumped.
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