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| Acer Extensa 4630Z (JALA0 LA-4221P) No Display https://vlab.su/viewtopic.php?f=59&t=67538 |
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| FRD [ 25 окт 2017, 23:37 ] | |
| Заголовок сообщения: | Acer Extensa 4630Z (JALA0 LA-4221P) No Display |
Hi There is a notebook (LA-4221p) which is turning on and fan spins but there is no Display, I have checked the following. Current Consumption is 0.8A PLT_RST# -> 3.3v H_RESET# -> 1.05v (CPU C1 Pin - Measured without CPU) H_PWRGOOD -> 1.05v (CPU D6 Pin - Measured without CPU) GMCH_ENVDD -> 0v (without LCD Connected) +LCDVDD -> 0v (without LCD Connected) After switching the motherboard on it doesn't read BIOS, there is clock available on BIOS chip (U17) but some strange signal present on SI SO pins. any help will be appreciated, thanks. |
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| pyry [ 28 окт 2017, 01:23 ] | |
| Заголовок сообщения: | Re: Acer Extensa 4630Z (JALA0 LA-4221P) No Display |
You already tried to reprogram the bios? |
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| FRD [ 28 окт 2017, 11:44 ] | |
| Заголовок сообщения: | Re: Acer Extensa 4630Z (JALA0 LA-4221P) No Display |
pyry писал(а): You already tried to reprogram the bios? yes I have reprogrammed the BIOS. |
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| pyry [ 28 окт 2017, 21:25 ] | |
| Заголовок сообщения: | Re: Acer Extensa 4630Z (JALA0 LA-4221P) No Display |
check that all coils are powered pl7, pl6, pl8, pl10, pl11 also measures that pu8 by pin 4 has 0.9v and pu11 pin 4 output 2.5v |
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| FRD [ 29 окт 2017, 14:09 ] | |
| Заголовок сообщения: | Re: Acer Extensa 4630Z (JALA0 LA-4221P) No Display |
pyry писал(а): check that all coils are powered pl7, pl6, pl8, pl10, pl11 also measures that pu8 by pin 4 has 0.9v and pu11 pin 4 output 2.5v Thanks for the answer. PL6 is 1.1v PL7 is 1.85v PL8 is 1.56v PL10 is 1.13v PL11 is 1.13v PU8 pin4 is 0.95 PU11 not soldered on the motherboard |
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| pyry [ 29 окт 2017, 19:28 ] | |
| Заголовок сообщения: | Re: Acer Extensa 4630Z (JALA0 LA-4221P) No Display |
friend here I leave the circuit to you to look at the voltages that you must have. The GMCH_ENVDD -> 0v is wrong should be 3v + LCDVDD -> 0v this should be have 3v try to measure with the LCD Connected sorry for the mistake I made in circuit |
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