|
Mon, Mar 19, 12 at 23:35
| 17" tv, AG brand.
Chassis model 40-MNTV2KM-L4W. Sound is ok and it changes channels, etc. But NO picture. I hear that 15kHz range sound and there is static in the screen. Did a fast check and Supply voltages are apparently good. Anode discharded to ground with spark, confirming that it was charged. What could cause this? Tomorrow I'll check the HOT to see if it's broken. Thanks in advance. RJ. |
Follow-Up Postings:
|
- Posted by yosemitebill (My Page) on Tue, Mar 20, 12 at 23:20
| Since you have already determined, although not measured, anode cap voltage was present and some other voltages derived were present, I would not suspect the HOT. Look for correct screen voltages to the CRT grids - usually around 160 volts - (could be related to HOT derived supply voltage rectification/filtering), proper blanking waveforms during the VBI, and any video blanking/muting circuits on the input side. Don't know anything about the brand, chassis, or if it's NTSC or PAL - just standard troubleshooting on CRT displays. Good luck!
|
Please Note: Only registered members are able to post messages to this forum. If you are a member, please log in. If you aren't yet a member, join now!
Return to the Electronics Forum
Instructions
- You must be a registered member and logged in to post messages on our forums.
- Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review the contents and make changes.
- After posting your message, you may need to refresh the forum page in order to see it.
- It is illegal to post copyrighted material without the owner's consent.
- HTML codes are allowed in the message field only.
- No advertising is allowed in any of the forums.
- If you would like to practice posting or uploading photos, please visit our Test forum.
- If you need assistance, please Contact Us and we will be happy to help.