monitor problem
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monitor problem
Hi, I own a Vektorlogic MEGA ARCADE games console 2004, and the CRT display has a collapse vertical deflection. There is a burnt out resistor that supply's the IC TDA1675A pin 14, I'm trying to get the circuit diagram for the CRT monitor boards and the only information I can find on the main circuit board is JCE-20A and the CRT neck board has JCE-20B. Is anyone able to help identify the manufacture of this CRT monitor so I can identify the burnt out resistor. Regards, Richard
- grantspain
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Re: monitor problem
photo would help
if the resistor to the ic has burnt up then likely the ic is bad
if the resistor to the ic has burnt up then likely the ic is bad
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Re: monitor problem
Yes the resistor has burnt out and the TDA167A has a short between pin 14 and ground, replacing the IC is not a problem, I'm looking to find out the value if the resistor but need the circuit diagram for this make of chassis. Richard
- grantspain
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Re: monitor problem
yes a photo of the chassis would help an awful lot
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Re: monitor problem
Based on the reference to the TDA1675A, it might be a hantarex. Not sure how many chassis used that particular component, but I recall it from a Hantarex 9110 that I brought back to life for a friend.
Here's a manual for the Hantarex monitors. Any resemblance?
https://www.arcade-museum.com/manuals-m ... onitor.pdf
Here's a manual for the Hantarex monitors. Any resemblance?
https://www.arcade-museum.com/manuals-m ... onitor.pdf
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Re: monitor problem
Thanks for reply, but that manual refers to the TDA1670 not the TDA1675A. Also my monitor is about a 20"
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Re: monitor problem
1675A is a replacement for the 1670A, and is likely the component used if it was already replaced.richwheat wrote:Thanks for reply, but that manual refers to the TDA1670 not the TDA1675A. Also my monitor is about a 20"
14", 16" and 20" manual:
https://www.arcade-museum.com/manuals-m ... Manual.pdf
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Re: monitor problem
I've managed to replace the IC TDA1675A and the resistor location is R840 on the chassis board JCA-20A. The resistor is badly burnt and not possible to identify it value by the colour bands, how ever it has a resistance of about 460 ohms but not sure if that's the effect after being burnt (current overload due to IC TDA1675A being short circuit from pin 8 +VCC to pin 14 ground) so finding the correct value of this resistor would be helpful. Do metalfilm resistor change there value if subjected to heat due to current overload?
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Re: monitor problem
Chassis and burnt resistor, can anyone help identify this manufacture.
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- grantspain
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Re: monitor problem
looks like intervideo, not sure of model number-might be a VP
- grantspain
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Re: monitor problem
it that resistor is on the vcc pin 14 to the tda 1675 then I would expect it to be something like 2r7 or 4r7 metal oxide
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Re: monitor problem
It's a Semio (aka "Monitor"), model Pico. R840 is 2.7 ohm flame proof type.
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Re: monitor problem
Thanks for the information but can you provide the circuit diagram or tell me where I can get it. Why is each circuit board connected to the chassis identified with JCE-20A/B/C/D. You mention that R840 is 2.7 ohms, could you provide more information as the +Vcc before the resistor is about +26 volts and didn't want to put a 2.7 ohm resistor as this will apply almost +26 volts to the TDA1675A pin 14 and not sure if this will cope. Thanks for the earlier information its really helpful.
- grantspain
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Re: monitor problem
+26 is spot on for this ic, infact pretty sure it run up 30-35v
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Re: monitor problem
Yup 35V max at pin 14.You do not have the required permissions to view the files attached to this post.
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Re: monitor problem
richwheat wrote:You mention that R840 is 2.7 ohms, could you provide more information as the +Vcc before the resistor is about +26 volts
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