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If the old mosfets, drain, source shorted to gate then the drive circuit is likely bad, check the resistors in the gate circuit of the mosfets, if the resistors are bad the drive ic's are likely bad, if the resistors are ok, the drive ic's could still be bad and not driving the mosfetsLast edited by R_J; Today, 05:24 PM.
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The CHAxx is a SGmicro SGM2033-ADJXN5G/TR (250ma) VS the SGM2019 (300ma)
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I found this video [URL="https://www.youtube.com/watch?app=desktop&v=0kNcFot1nF8"]ASUS ROG STRIX Z690-F GAMING WIFI + 12900K | PC Build - YouTube[/URL] and it seems that ic imay not be installed on this board
There is a 0Ω resistor in that circuit, check that it is not open.I found this video [URL="https://www.youtube.com/watch?app=desktop&v=0kNcFot1nF8"]ASUS ROG STRIX Z690-F GAMING WIFI + 12900K | PC Build - YouTube[/URL] and it seems that ic imay not be installed on this board
There is a 0Ω resistor in that circuit, check that it is not open.I found this...Last edited by R_J; 07-24-2024, 08:08 PM.
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I found this video and took this image, best I can do. [URL="https://www.youtube.com/watch?v=REO7Y66a68o"]KLEIN MM400 Multimeter Review & Teardown! - YouTube[/URL]I found this video and took this image, best I can do. [URL="https://www.youtube.com/watch?v=REO7Y66a68o"]KLEIN MM400 Multimeter Review & Teardown! - YouTube[/URL]I found this video and took this image, best I can do. [URL="https://www.youtube.com/watch?v=REO7Y66a68o"]KLEIN MM400 Multimeter Review & Teardown! - YouTube[/URL]...
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If you look at Q8601 The drain is connected to +160vdc via R8601, if the mosfet shorts D-G-S 160vdc gets fed to the ic through the gate resistor R8613,R8612 and also the source is connected directly to the ic, so it is possible it survived the voltage but who knows for sure. Post the ic number and we can look up the datasheet to see the pin max voltages.
C8611 is across Q8602 D~S so when the cap shorted, it likely caused Q8601 to short as well. replace the cap with a 2kv type of the same capacityLast edited by R_J; 07-23-2024, 09:57 PM.
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The drive ic U8501 is damaged, there may be other components in the gate drive that are also damaged. a short between drain and source will supply 160vdc to U8501....
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[URL=filedata/fetch?id=3313183&d=1721517746][ATTACH=JSON]{"alt":"Click image for larger version Name:\tPANASONIC RC-6900 clip.jpg Views:\t0 Size:\t317.9 KB ID:\t3313183","data-align":"none","data-attachmentid":"3313183","data-size":"small"}[/ATTACH][/URL] There is a small spring steel clip that is missing it fits in the knob slot and goes between the split in the shaft, something like this. You could try using a piece of stiff plastic to make it as well...
Last edited by R_J; 07-20-2024, 05:30 PM.
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Check the voltage on the ic's drain pin (lpin 5) looks like pin 8 is hot ground. If you have that (160vdc) voltage, check the ic's vcc voltage, using hot ground for meter negative, check the voltage on pin7 or D902 cathode (white line) and D902B, these voltages should be around 20vdc depending on the state of the ic.
If you have around 9vdc or the voltage is changing between 9~15v on either of the two diodes it may be that C904b or C907 is bad, don't check them just replace them.Last edited by R_J; 07-18-2024, 07:35 PM.
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Did you try adjusting the brightness and contrast controls? It might display [B]Cass?[/B] on screenDid you try adjusting the brightness and contrast controls? It might display [B]Cass?[/B] on screenDid you try adjusting the brightness and contrast controls? It might display [B]Cass?[/B] on screen
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The first voltage you need is standby voltage, check fuse resistor R915, ic901 is the standby pwm. If the resistor is open ic901 is likely bad.
You need 3.3vdc across C950a (or check for 3.3vdc on FB950 (near cn6401)Last edited by R_J; 07-14-2024, 10:33 PM.
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AEK-xxx is just pioneer's part number like there c42, c43 caps are ACH-239 (5600µf42v)
FU2, FU3 are in the L, R output so output transistors may be bad.Last edited by R_J; 07-09-2024, 06:14 PM.
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It looks like the sync polarity is not the issue but there is no vert hold adjustment on this chassis, I wasn't sure how he had the box connected to the tv...Last edited by R_J; 07-09-2024, 04:23 PM.
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[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3305859}[/ATTACH] Make sure the crt aguadag coating on the crt (the black coating on the outside of the crt glass) is grounded to the chassis It sounds like a ground might be missing, this is just the high voltage bleeding off it will not burn out or burst the crt.
Post a couple pictures of the rear of the tv so I can see the grounding on the crt and how the ground strap connects to the chassis. I tried looking up the model number you provided but it does not...Last edited by R_J; 07-09-2024, 10:57 AM.
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The problem is with your source, it is likely changing the video output signal resolution and sync polarity when the game starts, this tv is not meant for that. it is not a multi standard tv
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[URL=filedata/fetch?id=3304112&d=1720326034][ATTACH=JSON]{"alt":"Click image for larger version Name:\tzd-552.jpg Views:\t0 Size:\t26.9 KB ID:\t3304112","data-align":"none","data-attachmentid":"3304112","data-size":"medium"}[/ATTACH][/URL] These are the parts for that gun, I don't know where to get them in the us...
Last edited by R_J; 07-06-2024, 10:25 PM.
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Did you reinstall the original C433 (5.6µf/50vBP) capacitor? or did you use a replacement? Check connections around Q406~Q408 and the two adjustments vr400, vr401 (pincushion and horz. size circuit) it may be a dirty control or there may also be a weak elec. cap in that area as well.
I would resolder Q408, its connections don't look good from here.
Another electrolytic that can cause problems in these chassis is C406 (2.2µf/160v) horz. drive transformer filter cap.Last edited by R_J; 07-06-2024, 08:22 PM.
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R9122 is a 10K 1/8W 1%
You may want to replace C9305, C9308 C9122 and C9805 these are the caps on the ic's vcc supply, if they are weak the power supply may not turn on all the time.Last edited by R_J; 07-06-2024, 06:36 PM.
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That voltage would be correct with the switch in the OFF position, Change the switch to the ON position and you should have +5v on your so called 3 &4 pins
The pins 1 and 4 are just the switch mounting and are not part of the spdt switch contacts...Last edited by R_J; 07-06-2024, 06:07 PM.
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