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Re: Octek hippo vl+ 3.02 no POST no Beep no Code

Posted on 2023-03-11, 01:07

rasz_pl wrote on 2023-03-11, 00:51: just to be sure remove everything but the cpu and post card, that means no keyboard, no ram, no graphic card. You can even pull keyboard controller chip off Just tried it, nothing

Re: Octek hippo vl+ 3.02 no POST no Beep no Code

Posted on 2023-03-11, 00:33

by treeman

in Marvin \ General Old Hardware

Yeah good point, this is isa clock that is showing on the card. Well with 8mhz I can confirm the clock on the cpu pin so this is good enough to post. Have the fix the post issue first before looking at cpu clock gen again. I ordered the card but from China will take a while. As for the cpus yeah I …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-10, 21:26

by treeman

in Marvin \ General Old Hardware

This is progress. Can you change topic to something more descriptive? like "Octek hippo vl+ 3.02 no POST". I dont remember, are those confirmed working cpus you tried? Now we need to determine if CPU even tries. Some way for you to monitor CPU address lines and see if it attempts fetching first …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-10, 10:49

by treeman

in Marvin \ General Old Hardware

so I got the diagnostic card, but it shows me nothing. All the power lines are ok, clock is there (iwas wrong) reset is there. But it doesn't advance to post https://i.ibb.co/f9CjjcZ/IMG-20230310-213518.jpg So from my understanding it doesn't progress to the bios. I took the bios chip off and read …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-05, 21:18

by treeman

in Marvin \ General Old Hardware

I don't think its the jumper caps, I have tried the combinations many times. The only stable combination is 8mhz 25 and 33mhz are flaky at best and non existent most time. I still believe the clock gen is problematic but like rasz said on 8mhz I should be able to boot. I made some stupid mistakes …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 11:45

by treeman

in Marvin \ General Old Hardware

I tried a dx2 50 cpu not booting on 8mhz, I only saw 25mhz once and it changes quickly all the other times i see 0. Yeah I made a order for a post card since you mentioned it

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 11:18

by treeman

in Marvin \ General Old Hardware

ok, so far pin 14 - > ground pin 3 - > 5v+ I tried the combination you suggested I 0 0 0 got 8mhz on pin 11 Tried 33mhz combination = 0 Tried 25mhz combination = 25mhz... then changed to 40... 10... 2 it was not stable Tried I 0 0 0 2 more times and got 8mhz stable The 8mhz was also present on cpu …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 09:30

by treeman

in Marvin \ General Old Hardware

yeah ok, your right I realised I had the psu still plugged in when I took the measurement and it was beeping the resistance with psu 5-12 is 0.045 and with psu disconnected is 1 short beep and resistance of 0.145. Yeah user error im guilty. Anyway I took off both both jumpers jp4 and Jp5 clear, the …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 08:31

by treeman

in Marvin \ General Old Hardware

5 and 12 has resistance of 0.145 which my multimeter also gives a beep on continuity mode perhaps my mistake is using only continuity mode rather then looking at resistance to determine what is connected direct. Too late I took the chip off, the chip pin 5 to 12 has resistance of .600 so the chip …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 04:45

by treeman

in Marvin \ General Old Hardware

yeah good call, I have been itching to remove it but didn't want to seem too excited about it. But now green light

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 03:39

by treeman

in Marvin \ General Old Hardware

What I noticed also I was just looking at resistances and some of the pins that show continuity are not fully connected. For example JP5 pin 1 shows 0.01 resistance to pin3 on chrontel JP5 pin 1 shoes 0.125 resistance to pin5 on chrontel But on continuity mode in the multimeter both are low enough …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 00:56

by treeman

in Marvin \ General Old Hardware

The orange 5V+ (power good) shows 1 ohm but the other red 5V+ show continuity to pin 12 on chrontel chip Pin 5 on chrontel is grounded pin 4 (agnd) on the pinout you sent is also grounded

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-04, 00:32

by treeman

in Marvin \ General Old Hardware

could this be a short inside the chip? the logic of this setup seems illogical to me

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-03, 21:23

by treeman

in Marvin \ General Old Hardware

Jp5 pin 1 - > pin 3 4 5 9 10 12 14 pin 2 - > pin 2 pin 3 - > pin 3 4 5 9 10 12 14 Jp4 pin 1 - > pin 3 4 5 9 10 12 14 pin 2 - > pin 1 pin 3 - > pin 3 4 5 9 10 12 14 chrontel chip pin 7 - > crystal leg1 pin 8 - > crystal leg2 pin 13 - > 14mhz

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-03, 05:51

by treeman

in Marvin \ General Old Hardware

Ok I poked around the pins. Looking at it from the angle I drew the picture. The 2 middle pins only have 1 connection each pin 1 and pin 2 on the chrontel chip the other 4 pins top 2 and bottom 2 are all connected identically to the chip pin 3 4 5 9 10 12 14 pin 13 gives me 14mhz which doesn't have …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-03, 02:50

by treeman

in Marvin \ General Old Hardware

I measured with cpu and without and there is no HZ display. On the chrontel chip only on pin 13 I see 14mhz / 2.5V like you say. Other pins of chrontel show no hz but a few show 5v and 2 pins show 2.5V. 74fct chip shows no hz on any pin but shows voltage on many of the pins to be 2.6V I checked …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-02, 08:25

by treeman

in Marvin \ General Old Hardware

I have a vici vc97a Tried dx2 and dx cpus at 25 and 33fsb I tried the clock pin on the cpu slot and it doesn't show any hz, but in volt mode it shows 2.5V ~ Do you think it doesn't pick up the mhz in the cpu slot? When I try the 32mhz crystal it shows 32mhz ok

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-02, 06:34

by treeman

in Marvin \ General Old Hardware

The board is octek hippo vl+ 3.02 I had this board for a few years, I try a few things on it once in a while. The board never showed signs of life. No beeps no signal, the voltage is present in the rails, chipset bios etc. I even recapped it about a year ago. I also don't have a post card, I work …

Re: Can somebody tell me how the clock generator circuit works

Posted on 2023-03-02, 02:19

by treeman

in Marvin \ General Old Hardware

Thank you for the explanation. I thought the function is something how you explained it. The real work is done inside the clock gen chip using the initial signal from the crystal. As for the meter I was sceptical a multimeter can do the job of a osciloscope so now I know I am still working half …

Octek hippo vl+ 3.02 no POST no Beep no Code

Posted on 2023-03-01, 10:17

by treeman

in Marvin \ General Old Hardware

I have a 486 motherboard which I suspect the clock generator is not working. To troubleshoot it I want to learn more exactly how this circuit works. On my pcb I have a standard 14.318mhz crystal next to a chrontel clock generator. Using a multimeter in hz mode I got nothing direct from the crystal, …

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Re: Octek hippo vl+ 3.02 no POST no Beep no Code

Re: Octek hippo vl+ 3.02 no POST no Beep no Code

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Re: Can somebody tell me how the clock generator circuit works

Octek hippo vl+ 3.02 no POST no Beep no Code