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chumba
Joined: 01 Jul 2009
Posts: 66
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 Posted: Tue Nov 17, 2009 4:07 pm Post subject: |
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Yup I know, just not lucky enough to have a scope. Now I know what to ask for for Christmas 
What else can I check on IC001 to isolate if it is bad? It is a pretty expensive, honkin big IC, part# MN1873265. |
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JTS1957
Joined: 21 Jan 2009
Posts: 1330
Location: Far, Far Away
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| Posted: Tue Nov 17, 2009 7:13 pm Post subject: |
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Not that I know of...maybe will come back when Q001 replaced. But if not,  , only yourself to blame. |
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chumba
Joined: 01 Jul 2009
Posts: 66
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| Posted: Wed Nov 18, 2009 4:19 pm Post subject: |
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I believe this problem existed before I shorted Q001 and before replacing IC803 - remember the relay was clicking as soon as TV was plugged in without pressing power button.
Any other major pins to check on IC001 besides Pin 61, 22, 31, 62/63, 59 & 60? We know VDD, AVDD, SDA/SCL voltages are OK.
The pinout shows a bunch of other stuff such as PWM, ADIN, P07/RST, CREF, SPWM, VSS (pin 64). |
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JTS1957
Joined: 21 Jan 2009
Posts: 1330
Location: Far, Far Away
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| Posted: Wed Nov 18, 2009 6:30 pm Post subject: |
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What is pin #6 (Action switch) doing? What is voltage with and without Action button pressed?
Remember set would power "on" when the power cord was plugged in? (You never stated if pix/sound was there or would come and go each time the power button was pressed).
For that to occur one of the following was true: Relay contacts were "fused" together, Q001 was shorted, IC001 was telling set to turn on as soon as set was plugged in.  |
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chumba
Joined: 01 Jul 2009
Posts: 66
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| Posted: Sat Dec 05, 2009 2:33 pm Post subject: |
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IC001 pin6 measures 86 mVDC without Action switch pressed, and 70 mVDC with switch pressed.
After the repair the TV had picture but could not hear audio (but remember I could not adjust Volume because every control button showed like Action switch was pressed)
The strange thing is the 1st time the TV was plugged it did NOT always power on by itself and DID power on with the switch, but NEVER would power off. |
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chumba
Joined: 01 Jul 2009
Posts: 66
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| Posted: Sat Dec 12, 2009 4:07 pm Post subject: |
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| Working with surface mount parts is a real pain in the keester. I'm in the middle of replacing Q001 and the PCB land on its Base has come off. Should the Base of Q001 connect to D002? |
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JTS1957
Joined: 21 Jan 2009
Posts: 1330
Location: Far, Far Away
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| Posted: Sat Dec 12, 2009 4:20 pm Post subject: |
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NO!
R003. |
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chumba
Joined: 01 Jul 2009
Posts: 66
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| Posted: Sun Dec 13, 2009 4:29 pm Post subject: |
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| Cannot locate R003--what is it near/connected to? Should anything else be connected to Q001 Base (RL801 perhaps?) |
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JTS1957
Joined: 21 Jan 2009
Posts: 1330
Location: Far, Far Away
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| Posted: Sun Dec 13, 2009 6:51 pm Post subject: |
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Pin # 31 of IC001 to one end of R003. Other end of R003 to Base Q001. Period.  |
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chumba
Joined: 01 Jul 2009
Posts: 66
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| Posted: Wed Dec 16, 2009 3:09 pm Post subject: |
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| What is the value of R003? It is another tiny surface mount and needs to be replaced since it cracked. |
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