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Search: Posts Made By: senakahks
Forum: Troubleshooting TVs and Video Sources 09-20-2020, 07:14 PM
Replies: 0
Views: 84
Posted By senakahks
Samsung UA55HU7000 TV: HAVDD missing

I am working with a Samsung UA55HU7000 TV and backlight and sound works (volume up and down sound checked). But no picture. T-Con was replaced with a new one and still the result is same. Even with...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 09-06-2020, 07:22 PM
Replies: 3
Views: 188
Posted By senakahks
Lenavo Yoga 720: Is 7 Ohms a Vcore short to ground?

I am trying to fix a Lenavo Yoga 720. The buck converter near CPU shows 7Ohms short to ground. No schematic and I guess that is CPU VCore. Is is something normal?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-27-2020, 09:53 PM
Replies: 1
Views: 99
Posted By senakahks
Macbook 820-2915 (A1286) White Screen after apple logo

Dear All,

I have a problem which results white screen while loading with apple logo. Found in internet that it is a failure of C9560 which needed for PP1V5_GPU_REG.

I checked the voltage of...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-25-2020, 05:16 PM
Replies: 3
Views: 171
Posted By senakahks
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-24-2020, 09:22 PM
Replies: 3
Views: 171
Posted By senakahks
HP Pavillon G- Fan error (90B)

I trying to fix a l HP Pavillon G which gives the error message 90B fan error.

Fan is slowly running for about 2 seconds and stop about 2 seconds. that runs as a cycle. What could be the problem....
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-24-2020, 08:14 PM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

Yes. That is what I am using now.
What can I check for missing PM_SLP_S4_L?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-24-2020, 06:06 PM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

The charger I have used is a 15V one. So, once charger is changed, SYS_ONEWIRE gives 3.3V
Still no luck with FAN
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-24-2020, 05:54 PM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

Some voltages may be useful:
PM_PWRBTN_L: 3.4V
SMC_ONOFF_L: 3.4V
PM_SLP_S4_L: 0V

When trigger SMC_ONOFF_L, PM_PWRBTN_L goes down and come up.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-24-2020, 12:53 PM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

Tried to trigger by touching the ground to SMC_ONOFF_L. Fan doesn't move at all.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-24-2020, 03:46 AM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

Now SYS_ONEWIRE: 2.8V
Green Light is ON
S3 rails are not active yet.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-24-2020, 01:08 AM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

Valuable information. After replacing U6900, now green bulb works on charger. Fan is not working yet. Have to check now.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-23-2020, 01:37 PM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

Great support. Thank you!

So, even multimeter is not beeping, a resistance ~ 100 ohms via a chip to ground can be considered as a short to ground. Isn't it?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-23-2020, 04:23 AM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

Pin 4 pad
Voltage 3.4V
resistance to ground 5.4 M Ohms
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-22-2020, 02:02 PM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

U6900
Pin4 = 0V
pin5 = 0V

Resistance to ground
Pin4 = 123 Ohms
Pin5 = 1.7 M Ohms
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-21-2020, 10:47 PM
Replies: 17
Views: 370
Posted By senakahks
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0

SMC_BC_ACOK_VCC is 3.3V

So U6901 is giving the proper output.
U6900 getting the 3.3V to VCC pin. R6929 is not open.
Magsafe is woking fine with another computer
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-21-2020, 05:26 PM
Replies: 17
Views: 370
Posted By senakahks
820-2533 Macbook Pro - SYS_ONEWIRE: 0

15 inch macbook pro charger bulb doesn't come on. Seems there is a problem with SMC. The measured voltages given below. What could be the issue and and how can I go ahead?

PPBUS_G3H: 12.6...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-21-2020, 03:15 PM
Replies: 7
Views: 145
Posted By senakahks
Re: Openboardview shows other side components

Got it right with a combination of mirror, flip and rotate. Not sure which order followed :cool:
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-21-2020, 03:10 PM
Replies: 7
Views: 145
Posted By senakahks
Re: Openboardview shows other side components

Sorry. Flip gives this (see attached).

I am using the mac version. Is that the issue.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-21-2020, 02:51 PM
Replies: 7
Views: 145
Posted By senakahks
Re: Openboardview shows other side components

Thank you but flipping or mirroring does not solving the problem. Just check the image given below
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-21-2020, 12:51 PM
Replies: 7
Views: 145
Posted By senakahks
Openboardview shows other side components

Dear all,

When I try to locate components, Openboardview shows other side's components making me very difficult to locate the components needed. The board I am trying is 820-2533. The file is...
Forum: Troubleshooting TVs and Video Sources 08-20-2020, 03:06 PM
Replies: 3
Views: 137
Posted By senakahks
Re: power up "TV power supply without logicboard

I found this answers some of my questions.

https://www.badcaps.net/forum/attachment.php?attachmentid=194008&d=1555746469

Still others ideas are appreciated.
Forum: Troubleshooting TVs and Video Sources 08-20-2020, 02:10 PM
Replies: 3
Views: 137
Posted By senakahks
power up "TV power supply without logicboard

Isolating power supply issue is something very useful. As a beginner I have following questions regarding inputs to power supply.

As I understood PS_ON, DIM and BLK_ON are inputs to the PSU.
...
Forum: Troubleshooting TVs and Video Sources 08-16-2020, 09:40 PM
Replies: 18
Views: 431
Posted By senakahks
Re: Panasonic TH-50AS700 - Can I rely on LED tester results?

I opened the backlight and found that one LED is not working in 4th pair.
Forum: Troubleshooting TVs and Video Sources 08-16-2020, 07:34 PM
Replies: 18
Views: 431
Posted By senakahks
Re: Panasonic TH-50AS700 - Can I rely on LED tester results?

Thank you for very useful explanations. I am planning to replace LED strips. Before doing that. I got reading from backlight connector using the LED tester (after disconnecting from driver).

1st...
Forum: Troubleshooting TVs and Video Sources 08-15-2020, 08:48 PM
Replies: 18
Views: 431
Posted By senakahks
Re: Panasonic TH-50AS700 - Can I rely on LED tester results?

Say if there are 4 output pairs from the PSU to backlight, if all pairs give the same voltage for LED tester, can't we predict that at lease at that particular moment strip sets are working equally?...
Showing results 1 to 25 of 29

 
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