Re: LENOVO BIOS AUTO-PATCHER for Supervisor Password Removal


I guess it comes with experience – you see the symptom and immediately know the common cause


I will (or use a clip)… if I ever have to do it again (which I doubt, but who knows)


Thanks Markus, and greetings to Germany!...

Re: LENOVO BIOS AUTO-PATCHER for Supervisor Password Removal


Hi,

Thanks. I loaded it, but it didn't help, because:


You're right. Resistor and capacitor on the DO line went away. They're so tiny and so close to the chip I didn't notice it even with a loupe…

I shorted R694 and it started working. I guess I just got rid of some ESD protection, but I probably couldn't solder a resistor that tiny with my tools anyway…

The laptop works, there's no password, but next time I think I'll try the clip approach...

Re: LENOVO BIOS AUTO-PATCHER for Supervisor Password Removal

Hi folks,

I have a locked Lenovo T470 (20HE-S7DW03, TP00088A). I desoldered and dumped the eeprom (25Q128) – three times, just to be sure that the dump is OK. I patched it with autopatcher – it succeeded. After patching the new binary into the eeprom (and reading it back to verify) and soldering it back, the laptop doesn't start. Power button blinks three times after connecting the power supply, and pressing the power button doesn't have any effect.

Could anyone help?

Here's...

Re: Philips TV 42PFL3606H/58 (Thriller) (TPM6.1E) PSU problem (wrong Vdd-S)


Hi!

Sorry for the late reply, but life got in the way and I had to suspend it for a while…

Voltage on IC905 pin 1 varies:

1. In standby (and Vdd-S not loaded) it's around 0.6V with ripples around 1.25V (every 5ms or so):
[ATTACH]239372[/ATTACH]

Pin 2 is 5.80V then.

2. When running, but with Vdd-S not loaded, it's about the same, buth ripples are more frequent (every 1ms or so):
[ATTACH]239373[/ATTACH]
...

Re: Philips TV 42PFL3606H/58 (Thriller) (TPM6.1E) PSU problem (wrong Vdd-S)


But load regulation of +5VSB works (it maintains the voltage when I draw current from it), and +5VSB raises from 4.68V to 5.19V when I set S/B high (as expected from the circuit built around IC908). Could it work this way if IC907 was faulty?...

Hi!

I have a problem with a faulty PSU in the TV set (as in title) and honestly I'm stuck on it and could use a bit of advice if you don't mind…

The PSU's schematics is attached (psu1.png, psu2.png):

[ATTACH]238714[/ATTACH]

[ATTACH]238715[/ATTACH]

It produces +5VSB (standby), but doesn't produce any other voltage (12V, 24V, backlight). To test it, I connected +5VSB to S/B input (and to ENA input to disable the backlight).

After a bit of measuring I came to these conclusions:

1. +5VSB is produced...

Re: New Members - please post your introductions here

Hi everyone. You can call me CircuitChaos. I joined the forum because I'm stuck trying to repair a broken PSU in a TV set, but I hope to stay around!