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Start Up Fails When HDD Connected
Er, mine shines visible red...- Newcoppiceman
- Post #109
- Forum: HDR-FOX T2 Freeview Recorder
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Start Up Fails When HDD Connected
Something else to replace while I'm at it (we do use the SPDIF output). A common problem, I guess. The lead isn't a firm fit without the shutter.- Newcoppiceman
- Post #106
- Forum: HDR-FOX T2 Freeview Recorder
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Start Up Fails When HDD Connected
I meant other boards generally. When removing the components from the faulty PVR's board as described, I found they didn't "float away" once the solder was molten - they needed a bit of a shove; that led me to think they had glue dots. And when I cleaned up the not-faulty 2N4401 before fitting...- Newcoppiceman
- Post #105
- Forum: HDR-FOX T2 Freeview Recorder
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Start Up Fails When HDD Connected
Indeed. I pile-on some old-school solder to get the thermal mass up and then dislodge with a small flat-blade screwdriver once the solder on both sides of the component is molten - then clean-up using desoldering braid. Solder-suckers are an absolute no-no due to the significant risk of tiny...- Newcoppiceman
- Post #102
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
You have a point - but the ESR60 (not ...70 as I thought - that's a later version) results are conclusive, I'd say. I may do this - but look where, perhaps, trying to be too clever got me when I attached wires across the cap in-situ rather than simply removing it: one dead Mosfet. Also...- Newcoppiceman
- Post #99
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
Having successfully installed the not-faulty 2N4401 (removed from the faulty PVR – see post #81) in the good PVR we’ll be running on this until the replacement Mosfet has arrived and been fitted to the faulty PVR (which should restore HDD functionality); as I’ll put in a new 4u7 cap at the same...- Newcoppiceman
- Post #96
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
I was planning to cannibalise the HDD power cable and the board-mounted plug from the eBay PVR which arrived this week so that I could monitor the current (voltage across a low-value series resistor) on the 5V and 12V supplies during HDD run-up - but (a) events have overtaken that scheme; (b)...- Newcoppiceman
- Post #95
- Forum: HDR-FOX T2 Freeview Recorder
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Start Up Fails When HDD Connected
Don't think so - my pic in post #81 shows that I soldered the wires directly on the cap, some distance from U24, so it shouldn't have heated appreciably. Not sure when U24 died - the HDD was running-up ok early yesterday, after I'd attached the wires and 'scoped the voltage across the cap...- Newcoppiceman
- Post #93
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
HDD 12V switch schematic attached showing U24, now believed to be an FDC658 P-channel Mosfet (not as previously stated in post #80). Also attached, test results on a from-the-spares-drawer 4u7/50V cap for reference showing effects of freezing and recovery therefrom. Removed cap test results to...- Newcoppiceman
- Post #91
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
Full details later but, of necessity, I've had to remove U24 (and the cap, while I was at it). On the plus side this has allowed me to reverse-engineer what turns out to be the HDD 12V switch circuit (where the problem is) and conduct out-of-circuit checks on the cap with the ESR70. The fault...- Newcoppiceman
- Post #89
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
I attached the monitor wires to the suspect cap late yesterday morning and the PVR was returned to the lounge. As expected there were numerous boot attempts when switching on for lunch, and again late afternoon after having removed it to take the pic of the attached wires and replace the lid...- Newcoppiceman
- Post #86
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
Thanks - yes, a possible candidate. Aussie Dave Jones's long-running EEVblog (highly recommended) covered failure of these components a few years ago - #1037: youtube.com/watch?v=QgKY5QWehME An interesting update on the problem to follow lunchtime today following some overnight tests...- Newcoppiceman
- Post #85
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
Thanks for your comments. This is our in-service PVR (had to be returned in time for the missus to watch last night's Grand Designs over lunch) so I'm taking a "minimally-invasive" approach to minimise risk of damage to the board/domestic grief; it's easier to tack-on a couple of wires than...- Newcoppiceman
- Post #83
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Confidence was high that the 2N4401 was dud – but started to wane when its junctions were checked out of circuit with a DMM and nothing abnormal was found. Sure enough, after transplanting the one from the working PVR it didn’t fix the fault. Attention has returned to the nearby electrolytic...- Newcoppiceman
- Post #81
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
I deployed the can-of-freezer strategy this morning by firstly baking the faulty PVR in the oven at 30 degrees C for 30 minutes. As found previously, it then booted ok first time (nice and warm). I used the freezer on the accessible areas of the main board (some are hidden underneath the HDD)...- Newcoppiceman
- Post #80
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
Thought I'd confirm BH's waveforms on page 3 of this thread, so added monitor wire to U22 pin 6. Also sanitised the the HDD supplies monitoring. Then tried unplugging HDD and adding dummy loads to HDD's supplies (eg 20R across 12V = 600mA; 4R7 across 5V = 1.06A) ...and reboot problem goes away.- Newcoppiceman
- Post #79
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
Not the cap across U52's output - adding another made no difference (but had to try). To be continued...- Newcoppiceman
- Post #78
- Forum: HDR-FOX T2 Freeview Recorder
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N
Start Up Fails When HDD Connected
I now have a plan for tracking down the suspect electrolytic using a can of freezer - but before I go down that route, I’ll take a closer look at the timing wrt the HDD’s 5V rail of that troublesome pulse at U22’s enable pin (see BH's earlier work in this thread). I’ve attached a zoomed-in...- Newcoppiceman
- Post #77
- Forum: HDR-FOX T2 Freeview Recorder
-
-
-
N
Start Up Fails When HDD Connected
Er, mine shines visible red...- Newcoppiceman
- Post #109
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Something else to replace while I'm at it (we do use the SPDIF output). A common problem, I guess. The lead isn't a firm fit without the shutter.- Newcoppiceman
- Post #106
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
I meant other boards generally. When removing the components from the faulty PVR's board as described, I found they didn't "float away" once the solder was molten - they needed a bit of a shove; that led me to think they had glue dots. And when I cleaned up the not-faulty 2N4401 before fitting...- Newcoppiceman
- Post #105
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Indeed. I pile-on some old-school solder to get the thermal mass up and then dislodge with a small flat-blade screwdriver once the solder on both sides of the component is molten - then clean-up using desoldering braid. Solder-suckers are an absolute no-no due to the significant risk of tiny...- Newcoppiceman
- Post #102
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
You have a point - but the ESR60 (not ...70 as I thought - that's a later version) results are conclusive, I'd say. I may do this - but look where, perhaps, trying to be too clever got me when I attached wires across the cap in-situ rather than simply removing it: one dead Mosfet. Also...- Newcoppiceman
- Post #99
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Having successfully installed the not-faulty 2N4401 (removed from the faulty PVR – see post #81) in the good PVR we’ll be running on this until the replacement Mosfet has arrived and been fitted to the faulty PVR (which should restore HDD functionality); as I’ll put in a new 4u7 cap at the same...- Newcoppiceman
- Post #96
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
I was planning to cannibalise the HDD power cable and the board-mounted plug from the eBay PVR which arrived this week so that I could monitor the current (voltage across a low-value series resistor) on the 5V and 12V supplies during HDD run-up - but (a) events have overtaken that scheme; (b)...- Newcoppiceman
- Post #95
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Don't think so - my pic in post #81 shows that I soldered the wires directly on the cap, some distance from U24, so it shouldn't have heated appreciably. Not sure when U24 died - the HDD was running-up ok early yesterday, after I'd attached the wires and 'scoped the voltage across the cap...- Newcoppiceman
- Post #93
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
HDD 12V switch schematic attached showing U24, now believed to be an FDC658 P-channel Mosfet (not as previously stated in post #80). Also attached, test results on a from-the-spares-drawer 4u7/50V cap for reference showing effects of freezing and recovery therefrom. Removed cap test results to...- Newcoppiceman
- Post #91
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Full details later but, of necessity, I've had to remove U24 (and the cap, while I was at it). On the plus side this has allowed me to reverse-engineer what turns out to be the HDD 12V switch circuit (where the problem is) and conduct out-of-circuit checks on the cap with the ESR70. The fault...- Newcoppiceman
- Post #89
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
I attached the monitor wires to the suspect cap late yesterday morning and the PVR was returned to the lounge. As expected there were numerous boot attempts when switching on for lunch, and again late afternoon after having removed it to take the pic of the attached wires and replace the lid...- Newcoppiceman
- Post #86
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Thanks - yes, a possible candidate. Aussie Dave Jones's long-running EEVblog (highly recommended) covered failure of these components a few years ago - #1037: youtube.com/watch?v=QgKY5QWehME An interesting update on the problem to follow lunchtime today following some overnight tests...- Newcoppiceman
- Post #85
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Thanks for your comments. This is our in-service PVR (had to be returned in time for the missus to watch last night's Grand Designs over lunch) so I'm taking a "minimally-invasive" approach to minimise risk of damage to the board/domestic grief; it's easier to tack-on a couple of wires than...- Newcoppiceman
- Post #83
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Confidence was high that the 2N4401 was dud – but started to wane when its junctions were checked out of circuit with a DMM and nothing abnormal was found. Sure enough, after transplanting the one from the working PVR it didn’t fix the fault. Attention has returned to the nearby electrolytic...- Newcoppiceman
- Post #81
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
I deployed the can-of-freezer strategy this morning by firstly baking the faulty PVR in the oven at 30 degrees C for 30 minutes. As found previously, it then booted ok first time (nice and warm). I used the freezer on the accessible areas of the main board (some are hidden underneath the HDD)...- Newcoppiceman
- Post #80
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Thought I'd confirm BH's waveforms on page 3 of this thread, so added monitor wire to U22 pin 6. Also sanitised the the HDD supplies monitoring. Then tried unplugging HDD and adding dummy loads to HDD's supplies (eg 20R across 12V = 600mA; 4R7 across 5V = 1.06A) ...and reboot problem goes away.- Newcoppiceman
- Post #79
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
Not the cap across U52's output - adding another made no difference (but had to try). To be continued...- Newcoppiceman
- Post #78
- Forum: HDR-FOX T2 Freeview Recorder
-
N
Start Up Fails When HDD Connected
I now have a plan for tracking down the suspect electrolytic using a can of freezer - but before I go down that route, I’ll take a closer look at the timing wrt the HDD’s 5V rail of that troublesome pulse at U22’s enable pin (see BH's earlier work in this thread). I’ve attached a zoomed-in...- Newcoppiceman
- Post #77
- Forum: HDR-FOX T2 Freeview Recorder