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Technical Area / Re: Need help with Sanyo 20 ez (DKJR)
« on: June 04, 2014, 09:32:01 PM »
I've got a ESR meter and checked all caps, nothing strange.
The problem is definitely with missing video signals.
With respect the attached schematics:
- Signal circuit board 1 (Green) is about 3.5V
- Left of R213 I have 7V or so (the Zener diode, I assume)
- Voltage drops to 1V at the base of TR205. Voltage at BB is also around 1V.
- The same happens to the other two colors.
- R241 was running too hot (checked with a thermal camera) and looked cooked. I've replaced it with a 1W resistor.
I have reflowed the neck board and the control board, checked grounds, wires, etc...
Turning brightness and sub-brightness do not change anything.
Any suggestion?
Also, assuming that ALL trimmers have to be adjusted, how do I set up the monitor from scratch?
I have both the 108V and the 16V, but I wonder if the color drive and color trimmers on the neck board could cause this (I don't think it's the case, but I don't know what else to try....)
Thanks
The problem is definitely with missing video signals.
With respect the attached schematics:
- Signal circuit board 1 (Green) is about 3.5V
- Left of R213 I have 7V or so (the Zener diode, I assume)
- Voltage drops to 1V at the base of TR205. Voltage at BB is also around 1V.
- The same happens to the other two colors.
- R241 was running too hot (checked with a thermal camera) and looked cooked. I've replaced it with a 1W resistor.
I have reflowed the neck board and the control board, checked grounds, wires, etc...
Turning brightness and sub-brightness do not change anything.
Any suggestion?
Also, assuming that ALL trimmers have to be adjusted, how do I set up the monitor from scratch?
I have both the 108V and the 16V, but I wonder if the color drive and color trimmers on the neck board could cause this (I don't think it's the case, but I don't know what else to try....)
Thanks