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Re: Marantz SR5004 with missing IC 51
Fwiw
Gonna try one last thing before calling it a day, and that is to solder two wires from each terminal of the relay, then reassemble the whole unit, short the wires and see what happens?
Wish me luck. LolComment
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Re: Marantz SR5004 with missing IC 51
That didn't work, but what it did do was reveal that there is some kind of loose connection on the main board.
Still not sure if I have the passion to repair something which will only encourage people to sit in front of a TV and get further brainwashedComment
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Hello everyone,
Hope you are doing well.
This is my first attempt to repair Marantz and the receiver I am looking at is SR3001. It is in fully dead condition.
Here is what has been done/checked so far.
Earlier when I received this unit, I found the primary of the standby transformer was broken. I replaced the transformer with another which now give 5volts at the output of the regulator IC94.
The reset IC96 has the below voltages;
Pin1 --OUT--4.95v
Pin2 --INPUT--7.9v
Pin3 --GND--0v
Voltages... -
Hello friends,
I replace a shorted mofset (PU8104), now laptop is starting but no display, stopping at DRAMRST#.
Resistance to ground on PL8104 is around 1-2 ohm, quite low but voltage seems ok 0.995V
Any help would be appreciated it's a nice laptop !
Thanks. 😃 -
Hi all,
As the title suggests, how can I be sure that my EC chip is really dead?
I've recently gotten into this hobby of laptop repairs, and have successfully brought back to life a couple with some easy fixes, mostly shorted caps.
Now I'm working on HP Probook 455 G8, that had some "devil" run around on 3V line, burning a bunch of stuff. Luckily I have a dead 455G7 (for spare parts) so I managed to fix it (swapped burned parts) to a point that it will charge (both on barrel jack and usb-c), but it doesn't want to turn on. There is a 3V3 on a keyboard... -
Hi i need help troubleshooting lenovo legion y520 15ikbn
motherboard nm-b191
first of all i am newbie repairer and thinking if somebody could help me with this laptop what to check
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20v rail seems ok
3,3v rail also seems ok (pressing powerbutton does nothing but button tested ok and recieves 3,3v)
also SIO recieves powerbutton signal
some caps and resistors with 3v and 1v around SIO can be found but i think all signals are input signals
bios chip also getting 3,3v
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laptop shows no signs of life... -
Board had no history of liquid; unsure of drop history, but no signs of damage of any kind worth noting.
Charger sitting at 5v/0a. PPBUS is at 1.9v-0.9v steady cycle (peaks, drains, loops). Confirmed CHGR_EN_MVR is missing, but DCIN was reaching ISL just fine, so replaced ISL--no change at all. Confirmed pp3v8_aon is also missing--and being unsure *exactly* which signal appears first (or if they are simultaneous), I inspected PMU/U8100 area and found no shorts, but also found PP3V8_AON_MPMU_ISNS_VIN missing (not shorted). Replaced U8100 just in case (have had them fail in weird ways),...
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