pcbmaniac
Senior Member
Last Activity: 02-08-2025, 02:27 PM
Joined: 05-19-2014
Location: KOZANI
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Greetings from Hellas. My name is John and i 'm electrical engineer. My hobby is to fix electronic devices for me and my friends as well. I can read electronics schematics and most of the times i can do fixes. Thank you for acceptance. -
No, problem partialy solved. Green light ok, fun spining but no charging light no screen. All voltages looks good exept PPBAT_G3H from Q7055. Any help will be apreciated.Leave a comment:
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Finaly fix by replacing SMC and ISL6259. Thank you all for help.Leave a comment:
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Any chance to fix my old macbook by reheat in the point of pins under chip SMC? Any other ideas?Leave a comment:
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I did measures and find that PM_SUS_EN is missing. Since i dont have a replacement chip U7940, i put the missing resistor 0 ohms R7917 and now i do have both PP5V_SUS = 5V and PP3V3_SUS =3.3V. Then i noticed that signal S5_PWRGD is 0V. What to do next?Leave a comment:
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Since i use schematic PDF 820-3115, the part numbers and some values are different but the principal is the same. For now i must go to sleep. We can continue tomorrow at noon. Thank you for your help.Leave a comment:
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At Q7822 the gate pin [B]P5V_3V3_SUS_EN[/B] is 3.3VAt Q7822 the gate pin [B]P5V_3V3_SUS_EN[/B] is 3.3VAt Q7822 the gate pin [B]P5V_3V3_SUS_EN[/B] is 3.3VLeave a comment:
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I did measure it and found about 500 ohms.Leave a comment:
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After many measurements according to diagram mon2 sugested are all corect until, i found that voltage 3,3V_SUS_FET is only 0.3V. I do have at pin (4,7) - 3.3V and at pin (3), 3.3V as well. Any suggestions to go on tomorrow?Leave a comment:
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[B]Update:[/B] SMC Reballing Attempt success but..
After succesfuly rebaling SMC and replacing the U7000, i've managed to get both PP_BUS_G3H at 12,27V and PP3V4_G3H at 3,4V. Unfortunately i cant manage to make macbook operate no green light and no fan spining. Please advise, I can provide all the measurements i can.[B]Update:[/B] SMC Reballing Attempt success but..
After succesfuly rebaling SMC and replacing the U7000, i've managed to get both PP_BUS_G3H at 12,27V and PP3V4_G3H at 3,4V. Unfortunately i cant manage to make macbook operate no green light and no fan spining.Leave a comment:
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[B]Subject:[/B] Update: SMC Reballing Attempt
Unfortunately, I wasn't able to reball the SMC because I didn't have the correct stencil. I'll order the appropriate stencil along with some 0.3mm solder balls and will update once I try again.
Thank you for your reply and support![B]Subject:[/B] Update: SMC Reballing Attempt
Unfortunately, I wasn't able to reball the SMC because I didn't have the correct stencil. I'll order the appropriate stencil along with some 0.3mm solder balls and will update once I try again.
Thank you for your reply and sLeave a comment:
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I do a reballing to SMC and i will return.Leave a comment:
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Official magsafe, 3,4V stable, no green light no ppbus_g3h. Please tell me do i need to order SMC pre-programed or i can do it my self?Leave a comment:
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I measure after fuse F7040 with ground and found about 20KΩ resistane. Also when put DC power about 16,5V, the current is only about 16 mA.Leave a comment:
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MacBook A1278 (3115) No PPBUS_G3H Issue
[B]Subject:[/B] Help Needed: MacBook A1278 (3115) No PPBUS_G3H Issue
Hello everyone,
I'm working on a MacBook A1278 with the 3115 logic board and facing an issue with no [B]PPBUS_G3H[/B] voltage. Here's what I've checked so far:[LIST=1][*][B]U7000 Measurements[/B]:[LIST][*]Pin 3 has [B]0V[/B], even though [B]R7012[/B] shows [B]16.5V[/B] from [B]PPDCIN_S5_CHGR[/B].[/LIST][*][B]Resistors[/B]:[LIST][*]I measured [B]R7010[/B] and [B]R7011[/B] with one leg disconnected, and both tested OK.[/LIST][/LIST]
Based on these findings, I believe [B]U7000[/B] needs to be replaced.... -
Re: VESTEL 17MB82S not working only red led working
I did try again to reflash it but no luck and red led was off.
Then i did flash with LAVOR bin files and now when i press power on button from remote control, the red led flashes and then remains on as normal use should be.
At this point, i've measured Q9 and i find his base has 0,6V and colector has only 0,11V and then goes 0V. Q42 has 3,3V at Emmiter. I thing that CCT Protection is working all the time.
Also backlight voltage goes at 34V and then reduced slowly to 0V.
Since i 'm not a pro,...Leave a comment:
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Re: VESTEL 17MB82S not working only red led working
Thank you for your reply.
I did reflash my new IC's with turbo-x BIN files you send carrefuly, but now i don't get the RED LED flash, no picture, no backlight. All voltages are exists but no activity at all. No remote control commands as well.
USB stick has a LED on it and when is in the USB socket, it's on but no activity at all.
Do i need to reflash with the other ORAVA files you send or do i have 2 bad IC's
and need to replace them?
TIA...Leave a comment:
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Re: VESTEL 17MB82S not working only red led working
Since i 've replaced the old IC's corectly, the only problem i have is to find the corect upgrade file for my model. That's i'm talking about.Leave a comment:
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Re: VESTEL 17MB82S not working only red led working
Since i dont have backlight or picture, i put back the originals IC's U10,U12 and now i get three flashes wait a second and keep on this loop.
I 've tryed to do USB - pressing "OK" procedure but no luck. After finished, the LED goes of and then the 3 times blinking LED loop, still remains.
TV model TURBO-X 32" well known in Greece.
My panel is Vestel VES315WNDS-2D-N01
Main board 17MB82S with the U10,U12 near the PCMCIA socket
PSU 17iPS71
Thanking in advanceLeave a comment:
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VESTEL 17MB82S not working only red led working
Dear friends,
i do have a VESTEL 17MB82S not working. Here is the story:
First, when i give power on tv, red led lights after some blinkings and i've noticed that picture apears but no backligt at all (i use a small light to see it).
Then i do flash with a FAT32 USB stick, the upgrade_loader.pkg file with the known OK button method. After that, the TV stops and when i press the ON-OFF button from remote control, the red led goes on but no backlight no picture at all.
I do took off the 2 flash IC's U10,U12 try to read them with flash programmer, but i get "Error...
No activity results to display
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