Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
Did you manage to repair it?
Regards,
Suad...
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Re: Open Reel Dokorder 1140 recap - help needed!
Well, this is very complex device. Did you remove all boards and cleaned connectors and contacts on them? In most cases you can remove connector and clean board edge connectors in place. Head assembly goes out as well and is plugged into an edge connector. This one is first to clean. The sync board (four switches above head assembly) is second to clean, it has two edge connectors and lot relays as I recall. Also clean two meter bridge connectors. Finally all relays must be cleaned (there is lot of them), luckily all...
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help! - FIXED!
FIXED!!! :-) After replacing ML 4824 I got normal Vs and other missing voltages. TV works great, picture is fine! I really love this TV.
So, it was ML4824 after all - my first suspect! Actually, if they had IP version of IC in the local shop, I would replace it 4 weeks ago even before posting here. I'm little bit worried because I used CP version of IC as it has lower temperature range than IP, but I hope it will work for next few years...
I got following voltages:
...
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
I just bought ML4824CP1. It's a CP version which has slightly lower operating temperature range than IP version Samsung original. CP version has 0 to 70C and IP has -40 to 85C. IP version would be better because IC is located between two heatsinks, but CP is all they had in local shop for 6$. I'll try later, if it works I'll put a small heatsink on it. Stay tuned...
Thanks,
S...
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
Tried to remove fuse F4S. With F4S removed I get Vs = 0.8V. With F4S installed Vs = 6V. (measured with Sus boards disconnected)
Normal Vs value for this PSU and plasma module is 175V.
Thanks,
S...Last edited by scokljat; 09-18-2015, 05:28 AM.
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
When TV is in standby VS-ON signal is 0.4V
When TV is switched ON VS-ON signal is 2.95V
When TV is in standby PS-ON signal is 3.3V
When TV is switched ON PS-ON signal is 0.25V
I measured VS-ON and PS-ON relative to RTN (chasis ground)
Thanks,
S...
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
Short circuit test:
VS to RTN (chasis ground) - OK, open
Q1 Q2 Q3 Q4 Q6 Q8 - no shorts
D9 D10 - no shorts
F20S - OK
So, this is only simple short circuit test with DMM. If I want to test all FETs and transistors in detail I'll have to remove them from circuit which is very complicated on this PSU...
Removing F4S sounds like good idea. Will try later... but, it anything important is shorted, I suppose some fuses would blow....Last edited by scokljat; 09-18-2015, 05:06 AM.
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
Unfortunately, no luck :-( I replaced both caps C523 & C524. Actually I tested old caps as soon as I took them out from PCB. Both tested good on ESR tester. Replaced with new ones just in case...
So, we are back to square one... Any ideas? What about ML4824? I really need to fix this TV...
Cheers,
Suad...
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
I'm in a shop now buying these poly caps :-) stay tuned...
Update: bought the caps! These two caps are one of my primary suspects from the beginning. Definitely if these caps are bad, Vs will fail as on my TV set. They are located between heatsink and transformers, probably subjected to lot of heat. I'll replace them as soon as I get home tonight. Hope it will solve the problem...
Thanks!
S...Last edited by scokljat; 09-17-2015, 12:56 PM.
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
When TV is ON:
Vs = 6.5V (measured at Y-Sus/Z-Sus connector relative to chasis ground, no change when Sus boards are disconnected)
Take a look at beginning of thread.
Do you want me to measure Vs relative to GND_H? Probably not...
Thanks,
S...Last edited by scokljat; 09-17-2015, 11:37 AM.
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
Well, let's do it step by step.
First I'll check voltages on IC1 pins 12, 6 and 5. Right?
What do you want me to do with all other mentioned components related to IC1? (VCC_S_R, Q3, Q4, D9, D10, PC1S, IC5, PC10S, Q21) and signals VCC_S_R and VS_ON?
Btw, looks we are getting somewhere step by step, right? What is your primary suspect currently?
Thanks,
S...
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
I measured IC1 pin 13 (VCC) to pin 10 (GND_H). I see GND_H is not same as RTN (chassis ground) so I suppose all measurements on primary side of PSU must be measured relative to GND_H.
IC1 pin 13 voltage = [B]17.5V[/B]
See pic.
Thanks,
SRe: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
I measured IC1 pin 13 (VCC) to pin 10 (GND_H). I see GND_H is not same as RTN (chassis ground) so I suppose...
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
I did some measurements. I measured DC voltage directly on main rectifiers (BD1 & BD3 - two D15XB60 connected in parallel) and I also measured DC voltage on large filter caps (C5 & C6 330uF/450V connected in parallel). Positive sides of C5 & C6 are also connected directly to B+_PFC. See picture.
Readings when TV is ON (TV is 220/240V model):
Rectifiers: [B]215VDC[/B]
Large filter caps (B+_PFC): [B]320VDC[/B]
Any ideas? Is it too low?? Is...Last edited by scokljat; 09-16-2015, 12:44 PM.
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Re: Samsung PS-42D4S plasma. Has sound, no picture. Please help!
Hair dryer? Never heard of such apparatus ;-) Just kidding. I have a hair dryer and I also have a reflow station. What part exactly do you want me to heat? ...and what do you think we're going to accomplish?
Thanks,
S...
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