PCB Repair Logs Snow Bros - Revision history

Brad at 00:13, 7 February 2013

2013-02-07T00:13:16Z

← Older revision		Revision as of 08:13, 7 February 2013
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	<tr class=">		<tr class=">
	<td colspan="2" class="" style="text-align:center;">[[Image:marquee_snow_bros.png\|200px]]</td>		<td colspan="2" class="" style="text-align:center;">[[Image:marquee_snow_bros.png\|200px]]</td>
			</tr>
			<tr class="">
			<th scope="row" style="text-align:left; white-space: nowrap;">Manufacturer</th>
			<td class="" style="">[[PCB_Manufacturers_Toaplan\|Toaplan]]</td>
			</tr>
			<tr class="">
			<th scope="row" style="text-align:left; white-space: nowrap;">Year</th>
			<td class="" style="">1990</td>
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	<th scope="row" style="text-align:left; white-space: nowrap;">Pin Out</th>		<th scope="row" style="text-align:left; white-space: nowrap;">Pin Out</th>
	<td class="" style="">~~Reserved~~</td>		<td class="" style="">[[PCB_Pinouts_Jamma\|Jamma]]</td>
	</tr>		</tr>
	</table></p>		</table></p>

Brad: /* Snow Bros */

2013-01-24T06:23:01Z

Snow Bros

← Older revision		Revision as of 14:23, 24 January 2013
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	<th scope="row" style="text-align:left; white-space: nowrap;">PCB ~~Image~~</th>		<th scope="row" style="text-align:left; white-space: nowrap;">[http://wiki.aussiearcade.com.au/index.php/File:Snow_Bros_Repair_4_01.jpg Snow Bros PCB]</th>
	<td class="" style="">Reserved</td>		<td class="" style="">Reserved</td>
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Brad at 06:19, 24 January 2013

2013-01-24T06:19:34Z

← Older revision		Revision as of 14:19, 24 January 2013
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	[[File:~~Snow_Bros_Repair_4_022~~.jpg]]		[[File:Snow_Bros_Repair_4_22.jpg]]
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Brad at 06:18, 24 January 2013

2013-01-24T06:18:34Z

Show changes

Brad at 06:12, 24 January 2013

2013-01-24T06:12:42Z

← Older revision		Revision as of 14:12, 24 January 2013
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	I bought this board on eBay ages ago, probably at least a year, and have only just managed to get round to it.		I bought this board on eBay ages ago, probably at least a year, and have only just managed to get round to it.
	<br>		<br>
	[[~~http://wiki.aussiearcade.com.au/index.php/~~File:Snow_Bros_Repair_4_01.jpg]]		[[File:Snow_Bros_Repair_4_01.jpg]]
	<br>		<br>
	It turned out to be a pretty simple fix, well about 4 simple fixes in all. The seller sold it as dead, saying it used to boot up with a gfx fault until recently when a part fell off the board. The part was not described in the auction but it was included in the sale.		It turned out to be a pretty simple fix, well about 4 simple fixes in all. The seller sold it as dead, saying it used to boot up with a gfx fault until recently when a part fell off the board. The part was not described in the auction but it was included in the sale.

Brad at 06:11, 24 January 2013

2013-01-24T06:11:44Z

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 '''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/56021-Snow-Bros-Repair-Log Snow Bros PCB Repair]<br>
 <br>
 <br>[[PCB_Repair_Index|Back to PCB Repair Index]]

Brad at 05:38, 24 January 2013

2013-01-24T05:38:46Z

← Older revision		Revision as of 13:38, 24 January 2013
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	As for the resistor pack I have used hundreds of thousands of them in production boards over the years and never had a faulty one until now and will properly never find another one ever again.		As for the resistor pack I have used hundreds of thousands of them in production boards over the years and never had a faulty one until now and will properly never find another one ever again.
			<br>
			===Board 4===
			<br>
			'''Repairer:''' [http://www.aussiearcade.com.au/member.php/1983-Womble Womble]<br>
			'''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/56021-Snow-Bros-Repair-Log Snow Bros PCB Repair]<br>
			<br>


	<br>[[PCB_Repair_Index\|Back to PCB Repair Index]]		<br>[[PCB_Repair_Index\|Back to PCB Repair Index]]

Brad at 01:38, 6 September 2012

2012-09-06T01:38:55Z

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 </tr>
 </table></p>
+__TOC__
 '''Repairer:''' [http://www.aussiearcade.com.au/member.php/1983-Womble Womble]<br>
 '''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/24051-Snow-Bros-Repairlog Snow Bros PCB Repair]<br>
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 Just got to fix the second one now, handy that it is almost the same fault
 <br>
 <br>
 '''Repairer:''' [http://www.aussiearcade.com.au/member.php/1983-Womble Womble]<br>
@@ Line 147: / Line 152: @@
 I put a drop of PCB lacquer over the repaired RA5 to prevent it from oxidising as there was only a tiny bit of metal to work with originally,  I won't be lucky again
 <br>
 <br>[[PCB_Repair_Index|Back to PCB Repair Index]]

Brad at 02:32, 21 August 2012

2012-08-21T02:32:27Z

← Older revision		Revision as of 10:32, 21 August 2012
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	Just got to fix the second one now, handy that it is almost the same fault		Just got to fix the second one now, handy that it is almost the same fault
			<br>
			<br>
			'''Repairer:''' [http://www.aussiearcade.com.au/member.php/1983-Womble Womble]<br>
			'''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/24051-Snow-Bros-Repairlog Snow Bros PCB Repair]<br>
			<br>
			Thanks, am looking fwd to a good blast on it - my wife loves games like this too.

			Decided to have a go at the second board and it wasn't quite the same issue, will post it as a reply to this thread as there is a limit to the number of photos you can have in one post.

			So - the second board also had "gfx issues", when it 1st arrived and I plugged in it did this - the game ran but everything was red and flickering like mad.
			<br>
			<br>
			[[File:Pcb repair snow bros 11.jpg]]
			<br>
			<br>

			The RGB lines connect back to 3 resistor networks strung across two 74HC273s, at 9N and 9M, one of which had been removed rather violently by a previous owner so no surprise the colours were borked. Despite the way it looks all the plate-through holes were thankfully still connected to their tracks. The chips ground pin was still in its hole and had been cut off the chip when they gave up on it. This board is a pain to work on, the copper ground and 5V plane must be massive compared to my other SB board, its almost impossible to get things off this one.
			<br>
			<br>
			[[File:Pcb repair snow bros 12.jpg]]
			<br>
			<br>
			The existing HC273 tested as OK but I fitted a matching pair of new chips and brought a bit more life back to the board, a nice sepia tone to it all, plus flickering.
			<br>
			<br>
			[[File:Pcb repair snow bros 16.jpg]]
			<br>
			<br>
			Hitting the output pins on the 41464 chips as per the 1st board I found the chip at 4A had all 4 outputs stuck wobbling around high, so whipped it out, fitted a socket and a new chip.
			<br><br>
			[[File:Pcb repair snow bros 13.jpg]]
			<br>
			<br>
			I was expecting the board to fire up perfectly, except it didn't. The flickering was gone but everything was still sepia, a distinct lack of blue!

			I put the scope on the blue jamma pin and got nothing, the red and green were happily buzzing away. The blue pad on the JAMMA connector connects straight to the far end pin on resistor network RA5 at 10N which connects to the HC273s. On closer inspection it looks like this has had a bit of a whack. There was a small crack in the black housing by the +5V bus pin, which when poked with a screwdriver, flaked off.

			I desoldered the whole thing and the bus pin (that connects to 5V) fell off. I went over my scrap boards and could not find another one that was the right number of pins and the right rating, nor could I actually confirm anywhere that this is a normal resistor network - am not sure it is based on how it is connected in this circuit, so I got my mini files out and attempted to mend it. I filed just enough of the black coating to expose some of the metal pad on the internal structure. Refitted the component to the board minus the bus pin, then took an ofcut from an LED leg and bent it through the PCB hole so it lined up flush with the exposed inner metal on RA5. Soldered the old LED leg to the PCB then soldered the end to the broken edge of RA5.
			<br><br>
			[[File:Pcb repair snow bros 14.jpg]]
			<br>
			<br>
			A quick trim with the wire cutters and powered her back up.

			We have blue!!

			In fact we have a perfect Snow Bros board
			<br><br>[[File:Pcb repair snow bros 15.jpg]]
			<br>
			<br>
			I put a drop of PCB lacquer over the repaired RA5 to prevent it from oxidising as there was only a tiny bit of metal to work with originally, I won't be lucky again
			<br>


	<br>[[PCB_Repair_Index\|Back to PCB Repair Index]]		<br>[[PCB_Repair_Index\|Back to PCB Repair Index]]

Brad at 02:17, 21 August 2012

2012-08-21T02:17:36Z

@@ Line 19: / Line 19: @@
 '''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/24051-Snow-Bros-Repairlog Snow Bros PCB Repair]<br>
 <br>
 <br>[[PCB_Repair_Index|Back to PCB Repair Index]]