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RahaT

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  1. Bad POKEY or not, I probably damaged it now. I was touching around pins to feel how hot chip is in that area and caused electrical arcing with my finger. I did stupid thing even knowing I should not do that. Anyway look like POKEY chips are almost impossible to find. Maybe my best option is to look for another working console and this one can be for parts.
  2. I just tryed to clean one cartrige and it did not change anything. I turned off console and pulled out cartridge. I mean power switch is off, but my power adapter is still conected to console. I noticed that only my POKEY chip is warm and all other chips are cold. I left console like that for 10-15 min. and still only POKEY is warm. Is this sign of bad chip? Or, is it normal for POKEY to be warm when power switch is off?
  3. I did reset and it did not help. I looked at service manual and found what you mentioned about Q1 and Q2 transistors. Manual also mentioned Y1 christal next to them. I don't think issue is with carts since I tested w/ multiple carts and they all look very clean. I also cleaned cartridge slot. I think it would show some signs on screen if issue is there. I beleive issue is probably in some of main chips you mentioned. Acording to what you said, or I understood, POKEY is good candidate. I turned and tested all powers again. It was strange to me that power adapter did not warm up after 25 min., but maybe that was because I was not able to play games so there was not significant power draw. Anyway multimeter showed that I have 14.93 VDC when measured straight from power adapter. Inside console when it is powered it is about 12 VDC (little more or little less depending where is measured). VR1 output is 5.05 VDC. VR2 output is 5.10 VDC. All my chips receive regulated voltage. I powered console for 20-25 min. and all main large chips were all warm equally and not hot. I did not notice that there was any difference between them. I also checked other small chips and did not notice heating issues.
  4. Actually light played tricks on me. More I stared on screen I noticed that it is very dark orange (almost brown). I turned off light in room and and found that it is in fact orange or maybe red.
  5. Received few MJE210 transistors. Installed one in Q6 and also installed 7805 in VR1 but no luck. Screen is still black. Only good thing is that I have now 5.05 V in VR1 and in above mentioned chips.
  6. Yes, I am pretty sure that transistor is bad. I have voltage coming to Emitter and Base but no voltage coming out of Collector toward 7805 voltage regulator. I need to order one MJE210 transistor. I also tested voltage regulator by connecting 9V battery and I had about 5.7 output. I thing since I have a lot of 7805 regulators it will be good to change regulator too.
  7. Thank you for clarifying that to me about 7805 in VR1. I had some assumption about that transistor switch in Q6 but did not know how everything works. I do have spare 7805, but have to buy that thermal paste and I may need to order that transistor if 7805 is not issue.
  8. I traded one of my working 2600 for untested 5200 with 2 ports. I expected 5200 to be non working and I was right. It doesn't work. I just have black screen with any game I tryed. Power adapter is working and I hawe LED light ON. I downloaded schematics and noticed that there is two 7805 power regulators. Checked one in VR1 location and no power in or out. Checked other one in VR2 and my power out is 5.10 VDC. I don't know is that normal or should I have closer to 5 VDC? Anyway I am not sure for first 7805 in VR1, should I have power in there or that one receive power latter when some switch send it throug? I decided also to check power in all chips under metal shielding and found out that I don't have power in A7, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24 and A25 (chips are marked in red on photo). I am not sure what to do next. I did fix some 2600s, but 5200 is much more complex console. Anyone who can help?
  9. Did you check your channel switch on console? Did you try to move and wiggle RF cable? What kind of adapter you use to connect cable to antenna input? Did you try different TV?
  10. Thanks for tip DrVenkman. I have one console that player 2 switch works only in one difficulty. I'm gonna swap RIOT chip from other console and check if that is the case.
  11. I have same Radio Shack scoreboard and same problem with wavy video with a loud sound noise. For noise I can mute TV because pong sound is coming anyway from scoreboard. Only problem is wavy video on my TV screen. I will have to try to do same thing like you Kain3n. You do good job. Thumbs up.
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